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4ce92b23fe
cpython/Misc/NEWS
Ned Deily 4ce92b23fe #10907: Warn OS X 10.6 IDLE users to use ActiveState Tcl/Tk 8.5, 
rather than the currently problematic Apple-supplied one,
        when running with the 64-/32-bit installer variant.
2011-01-15 04:37:12 +00:00

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+++++++++++
Python News
+++++++++++
What's New in Python 3.2 Release Candidate 1
============================================
Core and Builtins
-----------------
- Issue #10892: Don't segfault when trying to delete __abstractmethods__ from a
class.
- Issue #8020: Avoid a crash where the small objects allocator would read
non-Python managed memory while it is being modified by another thread.
Patch by Matt Bandy.
- Issue #10841: On Windows, set the binary mode on stdin, stdout, stderr and
all io.FileIO objects (to not translate newlines, \r\n <=> \n). The Python
parser translates newlines (\r\n => \n).
- Remove buffer API from stable ABI for now, see #10181.
- Issue #8651: PyArg_Parse*() functions raise an OverflowError if the file
doesn't have PY_SSIZE_T_CLEAN define and the size doesn't fit in an int
(length bigger than 2^31-1 bytes).
- Issue #9015, #9611: FileIO.readinto(), FileIO.write(), os.write() and
stdprinter.write() clamp the length to 2^31-1 on Windows.
- Issue #8278: On Windows and with a NTFS filesystem, os.stat() and os.utime()
can now handle dates after 2038.
- Issue #10780: PyErr_SetFromWindowsErrWithFilename() and
PyErr_SetExcFromWindowsErrWithFilename() decode the filename from the
filesystem encoding instead of UTF-8.
- Issue #10779: PyErr_WarnExplicit() decodes the filename from the filesystem
encoding instead of UTF-8.
- Add sys.flags attribute for the new -q command-line option.
Library
-------
- Issue #10907: Warn OS X 10.6 IDLE users to use ActiveState Tcl/Tk 8.5,
rather than the currently problematic Apple-supplied one, when running
with the 64-/32-bit installer variant.
- Issue #4953: cgi.FieldStorage and cgi.parse() parse the request as bytes, not
as unicode, and accept binary files. Add encoding and errors attributes to
cgi.FieldStorage. Patch written by Pierre Quentel (with many inputs by Glenn
Linderman).
- Add encoding and errors arguments to urllib.parse_qs() and urllib.parse_qsl()
- Issue #10899: No function type annotations in the standard library.
Removed function type annotations from _pyio.py.
- Issue #10875: Update Regular Expression HOWTO; patch by 'SilentGhost'.
- Issue #10872: The repr() of TextIOWrapper objects now includes the mode
if available.
- Issue #10869: Fixed bug where ast.increment_lineno modified the root
node twice.
- Issue #5871: email.header.Header.encode now raises an error if any
continuation line in the formatted value has no leading white space
and looks like a header. Since Generator uses Header to format all
headers, this check is made for all headers in any serialized message
at serialization time. This provides protection against header
injection attacks.
- Issue #10859: Make ``contextlib.GeneratorContextManager`` officially
private by renaming it to ``_GeneratorContextManager``.
- Issue #10042: Fixed the total_ordering decorator to handle cross-type
comparisons that could lead to infinite recursion.
- Issue #10686: the email package now :rfc:`2047`\ -encodes headers with
non-ASCII bytes (parsed by a Bytes Parser) when doing conversion to
7bit-clean presentation, instead of replacing them with ?s.
- email.header.Header was incorrectly encoding folding white space when
rfc2047-encoding header values with embedded newlines, leaving them
without folding whitespace. It now uses the continuation_ws, as it
does for continuation lines that it creates itself.
- Issue #1777412, #10827: Changed the rules for 2-digit years. The
time.asctime(), time.ctime() and time.strftime() functions will now format
any year when ``time.accept2dyear`` is False and will accept years >= 1000
otherwise. ``time.mktime`` and ``time.strftime`` now accept full range
supported by the OS. With Visual Studio or on Solaris, the year is limited to
the range [1; 9999]. Conversion of 2-digit years to 4-digit is deprecated.
- Issue #7858: Raise an error properly when os.utime() fails under Windows
on an existing file.
- Issue #3839: wsgiref should not override a Content-Length header set by
the application. Initial patch by Clovis Fabricio.
- Issue #10492: bdb.Bdb.run() only traces the execution of the code, not the
compilation (if the input is a string).
- Issue #7995: When calling accept() on a socket with a timeout, the returned
socket is now always blocking, regardless of the operating system.
- Issue #10756: atexit normalizes the exception before displaying it. Patch by
Andreas Stührk.
- Issue #10790: email.header.Header.append's charset logic now works correctly
for charsets whose output codec is different from its input codec.
- Issue #10819: SocketIO.name property returns -1 when its closed, instead of
raising a ValueError, to fix repr().
- Issue #8650: zlib.compress() and zlib.decompress() raise an OverflowError if
the input buffer length doesn't fit into an unsigned int (length bigger than
2^32-1 bytes).
- Issue #6643: Reinitialize locks held within the threading module after fork
to avoid a potential rare deadlock or crash on some platforms.
- Issue #10806, issue #9905: Fix subprocess pipes when some of the standard
file descriptors (0, 1, 2) are closed in the parent process. Initial
patch by Ross Lagerwall.
- `unittest.TestCase` can be instantiated without a method name; for simpler
exploration from the interactive interpreter.
- Issue #10798: Reject supporting concurrent.futures if the system has too
few POSIX semaphores.
- Issue #10807: Remove base64, bz2, hex, quopri, rot13, uu and zlib codecs from
the codec aliases. They are still accessible via codecs.lookup().
- Issue #10801: In zipfile, support different encodings for the header and
the filenames.
- Issue #6285: IDLE no longer crashes on missing help file; patch by Scott
David Daniels.
- Fix collections.OrderedDict.setdefault() so that it works in
subclasses that define __missing__().
- Issue #10786: unittest.TextTestRunner default stream no longer bound at
import time. `sys.stderr` now looked up at instantiation time. Fix
contributed by Mark Roddy.
- Issue #10753: Characters ';','=' and ',' in the PATH_INFO environment
variable won't be quoted when the URI is constructed by the wsgiref.util 's
request_uri method. According to RFC 3986, these characters can be a part of
params in PATH component of URI and need not be quoted.
- Issue #10738: Fix webbrowser.Opera.raise_opts.
- Issue #9824: SimpleCookie now encodes , and ; in values to cater to how
browsers actually parse cookies.
- Issue #9333: os.symlink now available regardless of user privileges.
The function now raises OSError on Windows >=6.0 when the user is unable
to create symbolic links. XP and 2003 still raise NotImplementedError.
- Issue #10783: struct.pack() no longer implicitly encodes unicode to UTF-8.
- Issue #10730: Add SVG mime types to mimetypes module.
- Issue #10768: Make the Tkinter ScrolledText widget work again.
- Issue #10777: Fix "dictionary changed size during iteration" bug in
ElementTree register_namespace().
- Issue #10626: test_logging now preserves logger disabled states.
- Issue #10774: test_logging now removes temp files created during tests.
- Issue #5258/#10642: if site.py encounters a .pth file that generates an error,
it now prints the filename, line number, and traceback to stderr and skips
the rest of that individual file, instead of stopping processing entirely.
- Issue #10763: subprocess.communicate() closes stdout and stderr if both are
pipes (bug specific to Windows).
- Issue #1693546: fix email.message RFC 2231 parameter encoding to be in better
compliance (no "s around encoded values).
- Improved the diff message in the unittest module's assertCountEqual().
- Issue #1155362: email.utils.parsedate_tz now handles a missing space before
the '-' of a timezone field as well as before a '+'.
- Issue #4871: The zipfile module now gives a more useful error message if
an attempt is made to use a string to specify the archive password.
- Issue #10750: The ``raw`` attribute of buffered IO objects is now read-only.
- Deprecated assertDictContainsSubset() in the unittest module.
C-API
-----
- Issue #10333: Remove ancient GC API, which has been deprecated since
Python 2.2.
Build
-----
- Issue #10820: Fix OS X framework installs to support version-specific
scripts (#10679).
- Issue #7716: Under Solaris, don't assume existence of /usr/xpg4/bin/grep in
the configure script but use $GREP instead. Patch by Fabian Groffen.
- Issue #10475: Don't hardcode compilers for LDSHARED/LDCXXSHARED on NetBSD
and DragonFly BSD. Patch by Nicolas Joly.
- Issue #10679: The "idle", "pydoc" and "2to3" scripts are now installed with
a version-specific suffix on "make altinstall".
- Issue #10655: Fix the build on PowerPC on Linux with GCC when building with
timestamp profiling (--with-tsc): the preprocessor test for the PowerPC
support now looks for "__powerpc__" as well as "__ppc__": the latter seems to
only be present on OS X; the former is the correct one for Linux with GCC.
Tools/Demos
-----------
- Issue #7962: The Demo directory is gone. Most of the old and unmaintained
demos have been removed, others integrated in documentation or a new
Tools/demo subdirectory.
- Issue #10502: Addition of the unittestgui tool. Originally by Steve Purcell.
Updated for test discovery by Mark Roddy and Python 3 compatibility by
Brian Curtin.
Tests
-----
- Issue #10822: Fix test_posix:test_getgroups failure under Solaris. Patch
by Ross Lagerwall.
- Make the --coverage flag work for test.regrtest.
- Issue #1677694: Refactor and improve test_timeout. Original patch by
Björn Lindqvist.
- Issue #5485: Add tests for the UseForeignDTD method of expat parser objects.
Patch by Jean-Paul Calderone and Sandro Tosi.
- Issue #6293: Have regrtest.py echo back sys.flags. This is done by default
in whole runs and enabled selectively using ``--header`` when running an
explicit list of tests. Original patch by Collin Winter.
What's New in Python 3.2 Beta 2?
================================
*Release date: 19-Dec-2010*
Core and Builtins
-----------------
- Issue #8844: Regular and recursive lock acquisitions can now be interrupted
by signals on platforms using pthreads. Patch by Reid Kleckner.
- Issue #4236: PyModule_Create2 now checks the import machinery directly
rather than the Py_IsInitialized flag, avoiding a Fatal Python
error in certain circumstances when an import is done in __del__.
- Issue #5587: add a repr to dict_proxy objects. Patch by David Stanek and
Daniel Urban.
Library
-------
- Issue #3243: Support iterable bodies in httplib. Patch Contributions by
Xuanji Li and Chris AtLee.
- Issue #10611: SystemExit exception will no longer kill a unittest run.
- Issue #9857: It is now possible to skip a test in a setUp, tearDown or clean
up function.
- Issue #10573: use actual/expected consistently in unittest methods.
The order of the args of assertCountEqual is also changed.
- Issue #9286: email.utils.parseaddr no longer concatenates blank-separated
words in the local part of email addresses, thereby preserving the input.
- Issue #6791: Limit header line length (to 65535 bytes) in http.client
and http.server, to avoid denial of services from the other party.
- Issue #10404: Use ctl-button-1 on OSX for the context menu in Idle.
- Issue #9907: Fix tab handling on OSX when using editline by calling
rl_initialize first, then setting our custom defaults, then reading .editrc.
- Issue #4188: Avoid creating dummy thread objects when logging operations
from the threading module (with the internal verbose flag activated).
- Issue #10711: Remove HTTP 0.9 support from http.client. The ``strict``
parameter to HTTPConnection and friends is deprecated.
- Issue #9721: Fix the behavior of urljoin when the relative url starts with a
';' character. Patch by Wes Chow.
- Issue #10714: Limit length of incoming request in http.server to 65536 bytes
for security reasons. Initial patch by Ross Lagerwall.
- Issue #9558: Fix distutils.command.build_ext with VS 8.0.
- Issue #10667: Fast path for collections.Counter().
- Issue #10695: passing the port as a string value to telnetlib no longer
causes debug mode to fail.
- Issue #1078919: add_header now automatically RFC2231 encodes parameters
that contain non-ascii values.
- Issue #10188 (partial resolution): tempfile.TemporaryDirectory emits
a warning on sys.stderr rather than throwing a misleading exception
if cleanup fails due to nulling out of modules during shutdown.
Also avoids an AttributeError when mkdtemp call fails and issues
a ResourceWarning on implicit cleanup via __del__.
- Issue #10107: Warn about unsaved files in IDLE on OSX.
- Issue #7213: subprocess.Popen's default for close_fds has been changed.
It is now True in most cases other than on Windows when input, output or
error handles are provided.
- Issue #6559: subprocess.Popen has a new pass_fds parameter (actually
added in 3.2beta1) to allow specifying a specific list of file descriptors
to keep open in the child process.
- Issue #1731717: Fixed the problem where subprocess.wait() could cause an
OSError exception when The OS had been told to ignore SIGCLD in our process
or otherwise not wait for exiting child processes.
Tests
-----
- Issue #775964: test_grp now skips YP/NIS entries instead of failing when
encountering them.
Tools/Demos
-----------
- Issue #6075: IDLE on Mac OS X now works with both Carbon AquaTk and
Cocoa AquaTk.
- Issue #10710: ``Misc/setuid-prog.c`` is removed from the source tree.
- Issue #10706: Remove outdated script runtests.sh. Either ``make test``
or ``python -m test`` should be used instead.
Build
-----
- The Windows build now uses Tcl/Tk 8.5.9 and sqlite3 3.7.4.
- Issue #9234: argparse supports alias names for subparsers.
What's New in Python 3.2 Beta 1?
================================
*Release date: 05-Dec-2010*
Core and Builtins
-----------------
- Issue #10630: Return dict views from the dict proxy keys()/values()/items()
methods.
- Issue #10596: Fix float.__mod__ to have the same behaviour as float.__divmod__
with respect to signed zeros. -4.0 % 4.0 should be 0.0, not -0.0.
- Issue #1772833: Add the -q command-line option to suppress copyright and
version output in interactive mode.
- Provide an *optimize* parameter in the built-in compile() function.
- Fixed several corner case issues on Windows in os.stat/os.lstat related to
reparse points.
- PEP 384 (Defining a Stable ABI) is implemented.
- Issue #2690: Range objects support negative indices and slicing.
- Issue #9915: Speed up sorting with a key.
- Issue #8685: Speed up set difference ``a - b`` when source set ``a`` is much
larger than operand ``b``. Patch by Andrew Bennetts.
- Issue #10518: Bring back the callable() builtin.
- Issue #7094: Added alternate formatting (specified by '#') to ``__format__``
method of float, complex, and Decimal. This allows more precise control over
when decimal points are displayed.
- Issue #10474: range.count() should return integers.
- Issue #1574217: isinstance now catches only AttributeError, rather than
masking all errors.
Library
-------
- logging: added "handler of last resort". See http://bit.ly/last-resort-handler
- test.support: Added TestHandler and Matcher classes for better support of
assertions about logging.
- Issue #4391: Use proper plural forms in argparse.
- Issue #10601: sys.displayhook uses 'backslashreplace' error handler on
UnicodeEncodeError.
- Add the "display" and "undisplay" pdb commands.
- Issue #7245: Add a SIGINT handler in pdb that allows to break a program again
after a "continue" command.
- Add the "interact" pdb command.
- Issue #7905: Actually respect the keyencoding parameter to shelve.Shelf.
- Issue #1569291: Speed up array.repeat().
- Provide an interface to set the optimization level of compilation in
py_compile, compileall and zipfile.PyZipFile.
- Issue #7904: Changes to urllib.parse.urlsplit to handle schemes as defined by
RFC3986. Anything before :// is considered a scheme and is followed by an
authority (or netloc) and by '/' led path, which is optional.
- Issue #6045: dbm.gnu databases now support get() and setdefault() methods.
- Issue #10620: `python -m unittest` can accept file paths instead of module
names for running specific tests.
- Issue #9424: Deprecate the `unittest.TestCase` methods `assertEquals`,
`assertNotEquals`, `assertAlmostEquals`, `assertNotAlmostEquals` and `assert_`
and replace them with the correct methods in the Python test suite.
- Issue #10272: The ssl module now raises socket.timeout instead of a generic
SSLError on socket timeouts.
- Issue #10528: Allow translators to reorder placeholders in localizable
messages from argparse.
- Issue #10497: Fix incorrect use of gettext in argparse.
- Issue #10478: Reentrant calls inside buffered IO objects (for example by
way of a signal handler) now raise a RuntimeError instead of freezing the
current process.
- logging: Added getLogRecordFactory/setLogRecordFactory with docs and tests.
- Issue #10549: Fix pydoc traceback when text-documenting certain classes.
- Issue #2001: New HTML server with enhanced Web page features. Patch by Ron
Adam.
- Issue #10360: In WeakSet, do not raise TypeErrors when testing for membership
of non-weakrefable objects.
- Issue #940286: pydoc.Helper.help() ignores input/output init parameters.
- Issue #1745035: Add a command size and data size limit to smtpd.py, to prevent
DoS attacks. Patch by Savio Sena.
- Issue #4925: Add filename to error message when executable can't be found in
subprocess.
- Issue #10391: Don't dereference invalid memory in error messages in the ast
module.
- Issue #10027: st_nlink was not being set on Windows calls to os.stat or
os.lstat. Patch by Hirokazu Yamamoto.
- Issue #9333: Expose os.symlink only when the SeCreateSymbolicLinkPrivilege is
held by the user's account, i.e., when the function can actually be used.
- Issue #8879: Add os.link support for Windows.
- Issue #7911: ``unittest.TestCase.longMessage`` defaults to True for improved
failure messages by default. Patch by Mark Roddy.
- Issue #1486713: HTMLParser now has an optional tolerant mode where it tries to
guess at the correct parsing of invalid html.
- Issue #10554: Add context manager support to subprocess.Popen objects.
- Issue #8989: email.utils.make_msgid now has a domain parameter that can
override the domain name used in the generated msgid.
- Issue #9299: Add exist_ok parameter to os.makedirs to suppress the 'File
exists' exception when a target directory already exists with the specified
mode. Patch by Ray Allen.
- Issue #9573: os.fork() now works correctly when triggered as a side effect of
a module import.
- Issue #10464: netrc now correctly handles lines with embedded '#' characters.
- Added itertools.accumulate().
- Issue #4113: Added custom ``__repr__`` method to ``functools.partial``.
Original patch by Daniel Urban.
- Issue #10273: Rename `assertRegexpMatches` and `assertRaisesRegexp` to
`assertRegex` and `assertRaisesRegex`.
- Issue #10535: Enable silenced warnings in unittest by default.
- Issue #9873: The URL parsing functions in urllib.parse now accept ASCII byte
sequences as input in addition to character strings.
- Issue #10586: The statistics API for the new functools.lru_cache has been
changed to a single cache_info() method returning a named tuple.
- Issue #10323: itertools.islice() now consumes the minimum number of inputs
before stopping. Formerly, the final state of the underlying iterator was
undefined.
- Issue #10565: The collections.Iterator ABC now checks for both __iter__ and
__next__.
- Issue #10242: Fixed implementation of unittest.ItemsEqual and gave it a new
more informative name, unittest.CountEqual.
- Issue #10561: In pdb, clear the breakpoints by the breakpoint number.
- Issue #2986: difflib.SequenceMatcher gets a new parameter, autojunk, which can
be set to False to turn off the previously undocumented 'popularity'
heuristic. Patch by Terry Reedy and Eli Bendersky.
- Issue #10534: in difflib, expose bjunk and bpopular sets; deprecate
undocumented and now redundant isbjunk and isbpopular methods.
- Issue #9846: zipfile is now correctly closing underlying file objects.
- Issue #10459: Update CJK character names to Unicode 6.0.
- Issue #4493: urllib.request adds '/' in front of path components which does not
start with '/. Common behavior exhibited by browsers and other clients.
- Issue #6378: idle.bat now runs with the appropriate Python version rather than
the system default. Patch by Sridhar Ratnakumar.
- Issue #10470: 'python -m unittest' will now run test discovery by default,
when no extra arguments have been provided.
- Issue #3709: BaseHTTPRequestHandler will buffer the headers and write to
output stream only when end_headers is invoked. This is a speedup and an
internal optimization. Patch by endian.
- Issue #10220: Added inspect.getgeneratorstate. Initial patch by Rodolpho
Eckhardt.
- Issue #10453: compileall now uses argparse instead of getopt, and thus
provides clean output when called with '-h'.
- Issue #8078: Add constants for higher baud rates in the termios module. Patch
by Rodolpho Eckhardt.
- Issue #10407: Fix two NameErrors in distutils.
- Issue #10371: Deprecated undocumented functions in the trace module.
- Issue #10467: Fix BytesIO.readinto() after seeking into a position after the
end of the file.
- configparser: 100% test coverage.
- Issue #10499: configparser supports pluggable interpolation handlers. The
default classic interpolation handler is called BasicInterpolation. Another
interpolation handler added (ExtendedInterpolation) which supports the syntax
used by zc.buildout (e.g. interpolation between sections).
- configparser: the SafeConfigParser class has been renamed to ConfigParser.
The legacy ConfigParser class has been removed but its interpolation mechanism
is still available as LegacyInterpolation.
- configparser: Usage of RawConfigParser is now discouraged for new projects
in favor of ConfigParser(interpolation=None).
- Issue #1682942: configparser supports alternative option/value delimiters.
- Issue #5412: configparser supports mapping protocol access.
- Issue #9411: configparser supports specifying encoding for read operations.
- Issue #9421: configparser's getint(), getfloat() and getboolean() methods
accept vars and default arguments just like get() does.
- Issue #9452: configparser supports reading from strings and dictionaries
(thanks to the mapping protocol API, the latter can be used to copy data
between parsers).
- configparser: accepted INI file structure is now customizable, including
comment prefixes, name of the DEFAULT section, empty lines in multiline
values, and indentation.
- Issue 10326: unittest.TestCase instances can be pickled.
- Issue 9926: Wrapped TestSuite subclass does not get __call__ executed.
- Issue #9920: Skip tests for cmath.atan and cmath.atanh applied to complex
zeros on systems where the log1p function fails to respect the sign of zero.
This fixes a test failure on AIX.
- Issue #9732: Addition of getattr_static to the inspect module.
- Issue #10446: Module documentation generated by pydoc now links to a
version-specific online reference manual.
- Make the 'No module named' exception message from importlib consistent.
- Issue #10443: Add the SSLContext.set_default_verify_paths() method.
- Issue #10440: Support RUSAGE_THREAD as a constant in the resource module.
Patch by Robert Collins.
- Issue #10429: IMAP.starttls() stored the capabilities as bytes objects, rather
than strings.
C-API
-----
- Issue #10557: Added a new API function, PyUnicode_TransformDecimalToASCII(),
which transforms non-ASCII decimal digits in a Unicode string to their ASCII
equivalents.
- Issue #9518: Extend the PyModuleDef_HEAD_INIT macro to explicitly
zero-initialize all fields, fixing compiler warnings seen when building
extension modules with gcc with "-Wmissing-field-initializers" (implied by
"-W").
- Issue #10255: Fix reference leak in Py_InitializeEx(). Patch by Neil
Schemenauer.
- structseq.h is now included in Python.h.
- Loosen PyArg_ValidateKeywordArguments to allow dict subclasses.
Tests
-----
- regrtest.py once again ensures the test directory is removed from sys.path
when it is invoked directly as the __main__ module.
- `python -m test` can be used to run the test suite as well as `python -m
test.regrtest`.
- Do not fail test_socket when the IP address of the local hostname cannot be
looked up.
- Issue #8886: Use context managers throughout test_zipfile. Patch by Eric
Carstensen.
Build
-----
- Issue #10325: Fix two issues in the fallback definitions for PY_ULLONG_MAX and
PY_LLONG_MAX that made them unsuitable for use in preprocessor conditionals.
Documentation
-------------
- Issue #10299: List the built-in functions in a table in functions.rst.
What's New in Python 3.2 Alpha 4?
=================================
*Release date: 13-Nov-2010*
Core and Builtins
-----------------
- Issue #10372: Import the warnings module only after the IO library is
initialized, so as to avoid bootstrap issues with the '-W' option.
- Issue #10293: Remove obsolete field in the PyMemoryView structure, unused
undocumented value PyBUF_SHADOW, and strangely-looking code in
PyMemoryView_GetContiguous.
- Issue #6081: Add str.format_map(), similar to ``str.format(**mapping)``.
- If FileIO.__init__ fails, close the file descriptor.
- Issue #10221: dict.pop(k) now has a key error message that includes the
missing key (same message d[k] returns for missing keys).
- Issue #5437: A preallocated MemoryError instance should not keep traceback
data (including local variables caught in the stack trace) alive infinitely.
- Issue #10186: Fix the SyntaxError caret when the offset is equal to the length
of the offending line.
- Issue #10089: Add support for arbitrary -X options on the command line. They
can be retrieved through a new attribute ``sys._xoptions``.
- Issue #4388: On Mac OS X, decode command line arguments from UTF-8, instead of
the locale encoding. If the LANG (and LC_ALL and LC_CTYPE) environment
variable is not set, the locale encoding is ISO-8859-1, whereas most programs
(including Python) expect UTF-8. Python already uses UTF-8 for the filesystem
encoding and to encode command line arguments on this OS.
- Issue #9713, #10114: Parser functions (e.g. PyParser_ASTFromFile) expect
filenames encoded to the filesystem encoding with the surrogateescape error
handler (to support undecodable bytes), instead of UTF-8 in strict mode.
- Issue #9997: Don't let the name "top" have special significance in scope
resolution.
- Issue #9862: Compensate for broken PIPE_BUF in AIX by hard coding its value as
the default 512 when compiling on AIX.
- Use locale encoding instead of UTF-8 to encode and decode filenames if
Py_FileSystemDefaultEncoding is not set.
- Issue #10095: fp_setreadl() doesn't reopen the file, instead reuse the file
descriptor.
- Issue #9418: Moved private string methods ``_formatter_parser`` and
``_formatter_field_name_split`` into a new ``_string`` module.
- Issue #9992: Remove PYTHONFSENCODING environment variable.
Library
-------
- Issue #10465: fix broken delegating of attributes by gzip._PaddedFile.
- Issue #10356: Decimal.__hash__(-1) should return -2.
- Issue #1553375: logging: Added stack_info kwarg to display stack information.
- Issue #5111: IPv6 Host in the Header is wrapped inside [ ]. Patch by Chandru.
- Fix Fraction.__hash__ so that Fraction.__hash__(-1) is -2. (See also issue
#10356.)
- Issue #4471: Add the IMAP.starttls() method to enable encryption on standard
IMAP4 connections. Original patch by Lorenzo M. Catucci.
- Issue #1466065: Add 'validate' option to base64.b64decode to raise an error if
there are non-base64 alphabet characters in the input.
- Issue #10386: Add __all__ to token module; this simplifies importing in
tokenize module and prevents leaking of private names through ``import *``.
- Issue #4471: Properly shutdown socket in IMAP.shutdown(). Patch by Lorenzo
M. Catucci.
- Fix IMAP.login() to work properly.
- Issue #9244: multiprocessing pool worker processes could terminate
unexpectedly if the return value of a task could not be pickled. Only the
``repr`` of such errors are now sent back, wrapped in an
``MaybeEncodingError`` exception.
- Issue #9244: The ``apply_async()`` and ``map_async()`` methods of
``multiprocessing.Pool`` now accepts a ``error_callback`` argument. This can
be a callback with the signature ``callback(exc)``, which will be called if
the target raises an exception.
- Issue #10022: The dictionary returned by the ``getpeercert()`` method of SSL
sockets now has additional items such as ``issuer`` and ``notBefore``.
- ``usenetrc`` is now false by default for NNTP objects.
- Issue #1926: Add support for NNTP over SSL on port 563, as well as STARTTLS.
Patch by Andrew Vant.
- Issue #10335: Add tokenize.open(), detect the file encoding using
tokenize.detect_encoding() and open it in read only mode.
- Issue #10321: Add support for binary data to smtplib.SMTP.sendmail, and a new
method send_message to send an email.message.Message object.
- Issue #6011: sysconfig and distutils.sysconfig use the surrogateescape error
handler to parse the Makefile file. Avoid a UnicodeDecodeError if the source
code directory name contains a non-ASCII character and the locale encoding is
ASCII.
- Issue #10329: The trace module writes reports using the input Python script
encoding, instead of the locale encoding. Patch written by Alexander
Belopolsky.
- Issue #10126: Fix distutils' test_build when Python was built with
--enable-shared.
- Issue #9281: Prevent race condition with mkdir in distutils. Patch by
Arfrever.
- Issue #10229: Fix caching error in gettext.
- Issue #10252: Close file objects in a timely manner in distutils code and
tests. Patch by Brian Brazil, completed by Éric Araujo.
- Issue #10180: Pickling file objects is now explicitly forbidden, since
unpickling them produced nonsensical results.
- Issue #10311: The signal module now restores errno before returning from its
low-level signal handler. Patch by Hallvard B Furuseth.
- Issue #10282: Add a ``nntp_implementation`` attribute to NNTP objects.
- Issue #10283: Add a ``group_pattern`` argument to NNTP.list().
- Issue #10155: Add IISCGIHandler to wsgiref.handlers to support IIS CGI
environment better, and to correct unicode environment values for WSGI 1.0.1.
- Issue #10281: nntplib now returns None for absent fields in the OVER/XOVER
response, instead of raising an exception.
- wsgiref now implements and validates PEP 3333, rather than an experimental
extension of PEP 333. (Note: earlier versions of Python 3.x may have
incorrectly validated some non-compliant applications as WSGI compliant; if
your app validates with Python <3.2b1+, but not on this version, it is likely
the case that your app was not compliant.)
- Issue #10280: NNTP.nntp_version should reflect the highest version advertised
by the server.
- Issue #10184: Touch directories only once when extracting a tarfile.
- Issue #10199: New package, ``turtledemo`` now contains selected demo scripts
that were formerly found under Demo/turtle.
- Issue #10265: Close file objects explicitly in sunau. Patch by Brian Brazil.
- Issue #10266: uu.decode didn't close in_file explicitly when it was given as a
filename. Patch by Brian Brazil.
- Issue #10110: Queue objects didn't recognize full queues when the maxsize
parameter had been reduced.
- Issue #10160: Speed up operator.attrgetter. Patch by Christos Georgiou.
- logging: Added style option to basicConfig() to allow %, {} or $-formatting.
- Issue #5729: json.dumps() now supports using a string such as '\t' for
pretty-printing multilevel objects.
- Issue #10253: FileIO leaks a file descriptor when trying to open a file for
append that isn't seekable. Patch by Brian Brazil.
- Support context manager protocol for file-like objects returned by mailbox
``get_file()`` methods.
- Issue #10246: uu.encode didn't close file objects explicitly when filenames
were given to it. Patch by Brian Brazil.
- Issue #10198: fix duplicate header written to wave files when writeframes() is
called without data.
- Close file objects in modulefinder in a timely manner.
- Close a io.TextIOWrapper object in email.parser in a timely manner.
- Close a file object in distutils.sysconfig in a timely manner.
- Close a file object in pkgutil in a timely manner.
- Issue #10233: Close file objects in a timely manner in the tarfile module and
its test suite.
- Issue #10093: ResourceWarnings are now issued when files and sockets are
deallocated without explicit closing. These warnings are silenced by default,
except in pydebug mode.
- tarfile.py: Add support for all missing variants of the GNU sparse extensions
and create files with holes when extracting sparse members.
- Issue #10218: Return timeout status from ``Condition.wait`` in threading.
- Issue #7351: Add ``zipfile.BadZipFile`` spelling of the exception name and
deprecate the old name ``zipfile.BadZipfile``.
- Issue #5027: The standard ``xml`` namespace is now understood by
xml.sax.saxutils.XMLGenerator as being bound to
http://www.w3.org/XML/1998/namespace. Patch by Troy J. Farrell.
- Issue #5975: Add csv.unix_dialect class.
- Issue #7761: telnetlib.interact failures on Windows fixed.
- logging: Added style option to Formatter to allow %, {} or $-formatting.
- Issue #5178: Added tempfile.TemporaryDirectory class that can be used as a
context manager.
- Issue #1349106: Generator (and BytesGenerator) flatten method and Header
encode method now support a 'linesep' argument.
- Issue #5639: Add a *server_hostname* argument to ``SSLContext.wrap_socket`` in
order to support the TLS SNI extension. ``HTTPSConnection`` and ``urlopen()``
also use this argument, so that HTTPS virtual hosts are now supported.
- Issue #10166: Avoid recursion in pstats Stats.add() for many stats items.
- Issue #10163: Skip unreadable registry keys during mimetypes initialization.
- logging: Made StreamHandler terminator configurable.
- logging: Allowed filters to be just callables.
- logging: Added tests for _logRecordClass changes.
- Issue #10092: Properly reset locale in calendar.Locale*Calendar classes.
- logging: Added _logRecordClass, getLogRecordClass, setLogRecordClass to
increase flexibility of LogRecord creation.
- Issue #5117: Case normalization was needed on ntpath.relpath(). Also fixed
root directory issue on posixpath.relpath(). (Ported working fixes from
ntpath.)
- Issue #1343: xml.sax.saxutils.XMLGenerator now has an option
short_empty_elements to direct it to use self-closing tags when appropriate.
- Issue #9807 (part 1): Expose the ABI flags in sys.abiflags. Add --abiflags
switch to python-config for command line access.
- Issue #6098: Don't claim DOM level 3 conformance in minidom.
- Issue #5762: Fix AttributeError raised by ``xml.dom.minidom`` when an empty
XML namespace attribute is encountered.
- Issue #2830: Add the ``html.escape()`` function, which quotes all problematic
characters by default. Deprecate ``cgi.escape()``.
- Issue #9409: Fix the regex to match all kind of filenames, for interactive
debugging in doctests.
- Issue #9183: ``datetime.timezone(datetime.timedelta(0))`` will now return the
same instance as ``datetime.timezone.utc``.
- Issue #7523: Add SOCK_CLOEXEC and SOCK_NONBLOCK to the socket module, where
supported by the system. Patch by Nikita Vetoshkin.
- Issue #10063: file:// scheme will stop accessing remote hosts via ftp
protocol. file:// urls had fallback to access remote hosts via ftp. This was
not correct, change is made to raise a URLError when a remote host is tried to
access via file:// scheme.
- Issue #1710703: Write structures for an empty ZIP archive when a ZipFile is
created in modes 'a' or 'w' and then closed without adding any files. Raise
BadZipfile (rather than IOError) when opening small non-ZIP files.
- Issue #10041: The signature of optional arguments in socket.makefile() didn't
match that of io.open(), and they also didn't get forwarded properly to
TextIOWrapper in text mode. Patch by Kai Zhu.
- Issue #9003: http.client.HTTPSConnection, urllib.request.HTTPSHandler and
urllib.request.urlopen now take optional arguments to allow for server
certificate checking, as recommended in public uses of HTTPS.
- Issue #6612: Fix site and sysconfig to catch os.getcwd() error, eg. if the
current directory was deleted. Patch written by W. Trevor King.
- Issue #3873: Speed up unpickling from file objects that have a peek() method.
- Issue #10075: Add a session_stats() method to SSLContext objects.
- Issue #9948: Fixed problem of losing filename case information.
Extension Modules
-----------------
- Issue #5109: array.array constructor will now use fast code when
initial data is provided in an array object with correct type.
- Issue #6317: Now winsound.PlaySound only accepts unicode.
- Issue #6317: Now winsound.PlaySound can accept non ascii filename.
- Issue #9377: Use Unicode API for gethostname on Windows.
- Issue #10143: Update "os.pathconf" values.
- Issue #6518: Support context manager protcol for ossaudiodev types.
- Issue #678250: Make mmap flush a noop on ACCESS_READ and ACCESS_COPY.
- Issue #9054: Fix a crash occurring when using the pyexpat module with expat
version 2.0.1.
- Issue #5355: Provide mappings from Expat error numbers to string descriptions
and backwards, in order to actually make it possible to analyze error codes
provided by ExpatError.
- The Unicode database was updated to 6.0.0.
C-API
-----
- Issue #10288: The deprecated family of "char"-handling macros
(ISLOWER()/ISUPPER()/etc) have now been removed: use Py_ISLOWER() etc instead.
- Issue #9778: Hash values are now always the size of pointers. A new Py_hash_t
type has been introduced.
Tools/Demos
-----------
- Issue #10117: Tools/scripts/reindent.py now accepts source files that use
encoding other than ASCII or UTF-8. Source encoding is preserved when
reindented code is written to a file.
- Issue #7287: Demo/imputil/knee.py was removed.
Tests
-----
- Issue #3699: Fix test_bigaddrspace and extend it to test bytestrings as well
as unicode strings. Initial patch by Sandro Tosi.
- Issue #10294: Remove dead code form test_unicode_file.
- Issue #10123: Don't use non-ascii filenames in test_doctest tests. Add a new
test specific to unicode (non-ascii name and filename).
Build
-----
- Issue #10268: Add a --enable-loadable-sqlite-extensions option to configure.
- Issue #8852: Allow the socket module to build on OpenSolaris.
- Drop -OPT:Olimit compiler option.
- Issue #10094: Use versioned .so files on GNU/kfreeBSD and the GNU Hurd.
- Accept Oracle Berkeley DB 5.0 and 5.1 as backend for the dbm extension.
- Issue #7473: avoid link errors when building a framework with a different set
of architectures than the one that is currently installed.
What's New in Python 3.2 Alpha 3?
=================================
*Release date: 09-Oct-2010*
Core and Builtins
-----------------
- Issue #10068: Global objects which have reference cycles with their module's
dict are now cleared again. This causes issue #7140 to appear again.
- Issue #9738: Document PyErr_SetString() and PyErr_SetFromErrnoWithFilename()
encodings.
- ast.literal_eval() can now handle negative numbers. It is also a little more
liberal in what it accepts without compromising the safety of the evaluation.
For example, 3j+4 and 3+4+5 are both accepted.
- Issue #10006: type.__abstractmethods__ now raises an AttributeError. As a
result metaclasses can now be ABCs (see #9533).
- Issue #8670: ctypes.c_wchar supports non-BMP characters with 32 bits wchar_t.
- Issue #8670: PyUnicode_AsWideChar() and PyUnicode_AsWideCharString() replace
UTF-16 surrogate pairs by single non-BMP characters for 16 bits Py_UNICODE and
32 bits wchar_t (eg. Linux in narrow build).
- Issue #10003: Allow handling of SIGBREAK on Windows. Fixes a regression
introduced by issue #9324.
- Issue #9979: Create function PyUnicode_AsWideCharString().
- Issue #7397: Mention that importlib.import_module() is probably what someone
really wants to be using in __import__'s docstring.
- Issue #8521: Allow CreateKeyEx, OpenKeyEx, and DeleteKeyEx functions of winreg
to use named arguments.
- Issue #9930: Remove bogus subtype check that was causing (e.g.)
float.__rdiv__(2.0, 3) to return NotImplemented instead of the expected 1.5.
- Issue #9808: Implement os.getlogin for Windows. Patch by Jon Anglin.
- Issue #9901: Destroying the GIL in Py_Finalize() can fail if some other
threads are still running. Instead, reinitialize the GIL on a second call to
Py_Initialize().
- All SyntaxErrors now have a column offset and therefore a caret when the error
is printed.
- Issue #9252: PyImport_Import no longer uses a fromlist hack to return the
module that was imported, but instead gets the module from sys.modules.
- Issue #9213: The range type_items now provides index() and count() methods, to
conform to the Sequence ABC. Patch by Daniel Urban and Daniel Stutzbach.
- Issue #7994: Issue a PendingDeprecationWarning if object.__format__ is called
with a non-empty format string. This is an effort to future-proof user
code. If a derived class does not currently implement __format__ but later
adds its own __format__, it would most likely break user code that had
supplied a format string. This will be changed to a DeprecationWaring in
Python 3.3 and it will be an error in Python 3.4.
- Issue #9828: Destroy the GIL in Py_Finalize(), so that it gets properly
re-created on a subsequent call to Py_Initialize(). The problem (a crash)
wouldn't appear in 3.1 or 2.7 where the GIL's structure is more trivial.
- Issue #9210: Configure option --with-wctype-functions was removed. Using the
functions from the libc caused the methods .upper() and lower() to become
locale aware and created subtly wrong results.
- Issue #9738: PyUnicode_FromFormat() and PyErr_Format() raise an error on a
non-ASCII byte in the format string.
- Issue #4617: Previously it was illegal to delete a name from the local
namespace if it occurs as a free variable in a nested block. This limitation
of the compiler has been lifted, and a new opcode introduced (DELETE_DEREF).
- Issue #9804: ascii() now always represents unicode surrogate pairs as a single
``\UXXXXXXXX``, regardless of whether the character is printable or not.
Also, the "backslashreplace" error handler now joins surrogate pairs into a
single character on UCS-2 builds.
- Issue #9757: memoryview objects get a release() method to release the
underlying buffer (previously this was only done when deallocating the
memoryview), and gain support for the context management protocol.
- Issue #9797: pystate.c wrongly assumed that zero couldn't be a valid
thread-local storage key.
Library
-------
- Issue #2236: distutils' mkpath ignored the mode parameter.
- Fix typo in one sdist option (medata-check).
- Issue #9199: Fix incorrect use of distutils.cmd.Command.announce.
- Issue #1718574: Fix options that were supposed to accept arguments but did
not in build_clib.
- Issue #9437: Fix building C extensions with non-default LDFLAGS.
- Issue #4661: email can now parse bytes input and generate either converted
7bit output or bytes output. Email version bumped to 5.1.0.
- Issue #1589: Add ssl.match_hostname(), to help implement server identity
verification for higher-level protocols.
- Issue #9759: GzipFile now raises ValueError when an operation is attempted
after the file is closed. Patch by Jeffrey Finkelstein.
- Issue #9042: Fix interaction of custom translation classes and caching in
gettext.
- Issue #6706: asyncore.dispatcher now provides a handle_accepted() method
returning a (sock, addr) pair which is called when a connection has been
established with a new remote endpoint. This is supposed to be used as a
replacement for old handle_accept() and avoids the user to call accept()
directly.
- Issue #9065: tarfile no longer uses "root" as the default for the uname and
gname field.
- Issue #8980: Fixed a failure in distutils.command check that was shadowed by
an environment that does not have docutils. Patch by Arfrever.
- Issue #1050268: parseaddr now correctly quotes double quote and backslash
characters that appear inside quoted strings in email addresses.
- Issue #10004: quoprimime no longer generates a traceback when confronted with
invalid characters after '=' in a Q-encoded word.
- Issue #1491: BaseHTTPServer nows send a ``100 Continue`` response before
sending a 200 OK for the Expect: 100-continue request header.
- Issue #9360: Cleanup and improvements to the nntplib module. The API now
conforms to the philosophy of bytes and unicode separation in Python 3. A
test suite has also been added.
- Issue #9962: GzipFile now has the peek() method.
- Issue #9090: When a socket with a timeout fails with EWOULDBLOCK or EAGAIN,
retry the select() loop instead of bailing out. This is because select() can
incorrectly report a socket as ready for reading (for example, if it received
some data with an invalid checksum).
- Issue #3612: Added new types to ctypes.wintypes. (CHAR and pointers)
- Issue #9950: Fix socket.sendall() crash or misbehaviour when a signal is
received. Now sendall() properly calls signal handlers if necessary, and
retries sending if these returned successfully, including on sockets with a
timeout.
- Issue #9947: logging: Fixed locking bug in stopListening.
- Issue #9945: logging: Fixed locking bugs in addHandler/removeHandler.
- Issue #9936: Fixed executable lines' search in the trace module.
- Issue #9790: Rework imports necessary for samefile and sameopenfile
in ntpath.
- Issue #9928: Properly initialize the types exported by the bz2 module.
- Issue #1675951: Allow GzipFile to work with unseekable file objects. Patch by
Florian Festi.
- Logging: Added QueueListener class to facilitate logging usage for
performance-critical threads.
- Issue #9916: Add some missing errno symbols.
- Issue #9877: Expose sysconfig.get_makefile_filename()
- logging: Added hasHandlers() method to Logger and LoggerAdapter.
- Issue #9908: Fix os.stat() on bytes paths under Windows 7.
- Issue #2643: msync() is not called anymore when deallocating an open mmap
object, only munmap().
- logging: Changed LoggerAdapter implementation internally, to make it easier to
subclass in a useful way.
- logging: hasHandlers method was added to Logger, and isEnabledFor,
getEffectiveLevel, hasHandlers and setLevel were added to LoggerAdapter.
LoggerAdapter was introduced into the unit tests for logging.
- Issue #1686: Fix string.Template when overriding the pattern attribute.
- Issue #9854: SocketIO objects now observe the RawIOBase interface in
non-blocking mode: they return None when an operation would block (instead of
raising an exception).
- Issue #1730136: Fix the comparison between a tk.font.Font and an object of
another kind.
- Issue #9441: logging has better coverage for rotating file handlers.
- Issue #9865: collections.OrderedDict now has a __sizeof__ method.
- Issue #9854: The default read() implementation in io.RawIOBase now handles
non-blocking readinto() returning None correctly.
- Issue #1552: socket.socketpair() now returns regular socket.socket objects
supporting the whole socket API (rather than the "raw" _socket.socket
objects).
- Issue #9853: Fix the signature of SSLSocket.recvfrom() and SSLSocket.sendto()
to match the corresponding socket methods.
- Issue 9840: Added a decorator to reprlib for wrapping __repr__ methods to make
them handle recursive calls within the same thread.
- logging: Enhanced HTTPHandler with secure and credentials initializers.
- Issue #767645: Set os.path.supports_unicode_filenames to True on Mac OS X.
- Issue #9837: The read() method of ZipExtFile objects (as returned by
ZipFile.open()) could return more bytes than requested.
- Issue #9826: OrderedDict.__repr__ can now handle self-referential values:
d['x'] = d.
- Issue #9825: Using __del__ in the definition of collections.OrderedDict made
it possible for the user to create self-referencing ordered dictionaries which
become permanently uncollectable GC garbage. Reinstated the Python 3.1
approach of using weakref proxies so that reference cycles never get created
in the first place.
- Issue #9579, #9580: Fix os.confstr() for value longer than 255 bytes and
encode the value with filesystem encoding and surrogateescape (instead of
utf-8 in strict mode) . Patch written by David Watson.
- Issue #9632: Remove sys.setfilesystemencoding() function: use PYTHONFSENCODING
environment variable to set the filesystem encoding at Python startup.
sys.setfilesystemencoding() creates inconsistencies because it is unable to
reencode all filenames in all objects.
- Issue #9410: Various optimizations to the pickle module, leading to speedups
up to 4x (depending on the benchmark). Mostly ported from Unladen Swallow;
initial patch by Alexandre Vassalotti.
- The pprint module now supports printing OrderedDicts in their given order
(formerly, it would sort the keys).
- Logging: Added QueueHandler class to facilitate logging usage with
multiprocessing.
- Issue #9707: Rewritten reference implementation of threading.local which is
friendlier towards reference cycles. This change is not normally visible
since an optimized C implementation (_thread._local) is used instead.
- Issue #6394: os.getppid() is now supported on Windows. Note that it will
still return the id of the parent process after it has exited. This process
id may even have been reused by another unrelated process.
- Issue #9792: In case of connection failure, socket.create_connection() would
swallow the exception and raise a new one, making it impossible to fetch the
original errno, or to filter timeout errors. Now the original error is
re-raised.
- Issue #9758: When fcntl.ioctl() was called with mutable_flag set to True, and
the passed buffer was exactly 1024 bytes long, the buffer wouldn't be updated
back after the system call. Original patch by Brian Brazil.
- Updates to the random module:
* Document which parts of the module are guaranteed to stay the same across
versions and which parts are subject to change.
* Update the seed() method to use all of the bits in a string instead of just
the hash value. This makes better use of the seed value and assures the
seeding is platform independent. Issue #7889.
* Improved the random()-->integer algorithm used in choice(), shuffle(),
sample(), randrange(), and randint(). Formerly, it used int(n*random())
which has a slight bias whenever n is not a power of two. Issue #9025.
* Improved documentation of arguments to randrange(). Issue #9379.
- collections.OrderedDict now supports a new method for repositioning keys to
either end.
- Issue #9754: Similarly to assertRaises and assertRaisesRegexp, unittest test
cases now also have assertWarns and assertWarnsRegexp methods to check that a
given warning type was triggered by the code under test.
- Issue #5506: BytesIO objects now have a getbuffer() method exporting a view of
their contents without duplicating them. The view is both readable and
writable.
- Issue #7566: Implement os.path.sameopenfile for Windows.
- Issue #9293: I/O streams now raise ``io.UnsupportedOperation`` when an
unsupported operation is attempted (for example, writing to a file open only
for reading).
- hashlib has two new constant attributes: algorithms_guaranteed and
algorithms_avaiable that respectively list the names of hash algorithms
guaranteed to exist in all Python implementations and the names of hash
algorithms available in the current process.
- A new package ``concurrent.futures`` as defined by PEP 3148.
C-API
-----
- Add PyErr_SyntaxLocationEx, which supports passing a column offset.
- Issue #9834: Don't segfault in PySequence_GetSlice, PySequence_SetSlice, or
PySequence_DelSlice when the object doesn't have any mapping operations
defined.
Tools/Demos
-----------
- Issue #9188: The gdb extension now handles correctly narrow (UCS2) as well as
wide (UCS4) unicode builds for both the host interpreter (embedded inside gdb)
and the interpreter under test.
Tests
-----
- Issue #9308: Added tests for importing encoded modules that do not
depend on specific stdlib modules being encoded in a certain way.
- Issue #1051: Add a script (Lib/test/make_ssl_certs.py) to generate the custom
certificate and private key files used by SSL-related certs.
- Issue #9978: Wait until subprocess completes initialization. (Win32KillTests
in test_os)
- Issue #7110: regrtest now sends test failure reports and single-failure
tracebacks to stderr rather than stdout.
- Issue #9628: fix runtests.sh -x option so more than one test can be excluded.
- Issue #9899: Fix test_tkinter.test_font on various platforms. Patch by Ned
Deily.
- Issue #9894: Do not hardcode ENOENT in test_subprocess.
- Issue #9315: Added tests for the trace module. Patch by Eli Bendersky.
- Issue #9323: Make test.regrtest.__file__ absolute, this was not always the
case when running profile or trace, for example.
- Issue #9568: Fix test_urllib2_localnet on OS X 10.3.
Build
-----
- Issue #10062: Allow building on platforms which do not have sem_timedwait.
- Issue #10054: Some platforms provide uintptr_t in inttypes.h. Patch by Akira
Kitada.
- Issue #10055: Make json C89-compliant in UCS4 mode.
- Issue #9552: Avoid unnecessary rebuild of OpenSSL. (Windows)
- Issue #1633863: Don't ignore $CC under AIX.
- Issue #9810: Compile bzip2 source files in Python's project file directly. It
used to be built with bzip2's makefile.
- Issue #9848: Stopping trying to build _weakref in setup.py as it is a built-in
module.
- Issue #9806: python-config now has an ``--extension-suffix`` option that
outputs the suffix for dynamic libraries including the ABI version name
defined by PEP 3149.
- Issue #941346: Improve the build process under AIX and allow Python to be
built as a shared library. Patch by Sébastien Sablé.
- Issue #4026: Make the fcntl extension build under AIX. Patch by Sébastien
Sablé.
- Issue #9701: The MacOSX installer can patch the shell profile to ensure that
the "bin" directory inside the framework is on the shell's search path. This
feature now also supports the ZSH shell.
What's New in Python 3.2 Alpha 2?
=================================
*Release date: 05-Sep-2010*
Core and Builtins
-----------------
- Issue #9225: Remove the ROT_FOUR and DUP_TOPX opcode, the latter replaced by
the new (and simpler) DUP_TOP_TWO. Performance isn't changed, but our
bytecode is a bit simplified. Patch by Demur Rumed.
- Issue #9766: Rename poorly named variables exposed by _warnings to prevent
confusion with the proper variables names from 'warnings' itself.
- Issue #9212: dict_keys and dict_items now provide the isdisjoint() method, to
conform to the Set ABC. Patch by Daniel Urban.
- Issue #9737: Fix a crash when trying to delete a slice or an item from a
memoryview object.
- Issue #9549: sys.setdefaultencoding() and PyUnicode_SetDefaultEncoding() are
now removed, since their effect was inexistent in 3.x (the default encoding is
hardcoded to utf-8 and cannot be changed).
- Issue #7415: PyUnicode_FromEncodedObject() now uses the new buffer API
properly. Patch by Stefan Behnel.
- Issue #5553: The Py_LOCAL_INLINE macro now results in inlining on most
platforms. Previously, it inlined only when using Microsoft Visual C.
- Issue #9712: Fix tokenize on identifiers that start with non-ascii names.
- Issue #9688: __basicsize__ and __itemsize__ must be accessed as Py_ssize_t.
- Issue #9684: Added a definition for SIZEOF_WCHAR_T to PC/pyconfig.h, to match
the pyconfig.h generated by configure on other systems.
- Issue #9666: Only catch AttributeError in hasattr(). All other exceptions that
occur during attribute lookup are now propagated to the caller.
- Issue #8622: Add PYTHONFSENCODING environment variable to override the
filesystem encoding.
- Issue #5127: The C functions that access the Unicode Database now accept and
return characters from the full Unicode range, even on narrow unicode builds
(Py_UNICODE_TOLOWER, Py_UNICODE_ISDECIMAL, and others). A visible difference
in Python is that unicodedata.numeric() now returns the correct value for
large code points, and repr() may consider more characters as printable.
- Issue #9425: Create PyModule_GetFilenameObject() function to get the filename
as a unicode object, instead of a byte string. Function needed to support
unencodable filenames. Deprecate PyModule_GetFilename() in favor on the new
function.
- Issue #8063: Call _PyGILState_Init() earlier in Py_InitializeEx().
- Issue #9612: The set object is now 64-bit clean under Windows.
- Issue #8202: sys.argv[0] is now set to '-m' instead of '-c' when searching for
the module file to be executed with the -m command line option.
- Issue #9599: Create PySys_FormatStdout() and PySys_FormatStderr() functions to
write a message formatted by PyUnicode_FromFormatV() to sys.stdout and
sys.stderr.
- Issue #9542: Create PyUnicode_FSDecoder() function, a ParseTuple converter:
decode bytes objects to unicode using PyUnicode_DecodeFSDefaultAndSize(); str
objects are output as-is.
- Issue #9203: Computed gotos are now enabled by default on supported compilers
(which are detected by the configure script). They can still be disable
selectively by specifying --without-computed-gotos.
- Issue #9425: Create PyErr_WarnFormat() function, similar to PyErr_WarnEx() but
use PyUnicode_FromFormatV() to format the warning message.
- Issue #8530: Prevent stringlib fastsearch from reading beyond the front of an
array.
- Issue #5319: Print an error if flushing stdout fails at interpreter shutdown.
- Issue #9337: The str() of a float or complex number is now identical to its
repr().
- Issue #9416: Fix some issues with complex formatting where the output with no
type specifier failed to match the str output:
- format(complex(-0.0, 2.0), '-') omitted the real part from the output,
- format(complex(0.0, 2.0), '-') included a sign and parentheses.
Extension Modules
-----------------
- Issue #8013: time.asctime and time.ctime no longer call system
asctime and ctime functions. The year range for time.asctime is now
1900 through maxint. The range for time.ctime is the same as for
time.localtime. The string produced by these functions is longer
than 24 characters when year is greater than 9999.
- Issue #6608: time.asctime is now checking struct tm fields its input
before passing it to the system asctime. Patch by MunSic Jeong.
- Issue #8734: Avoid crash in msvcrt.get_osfhandle() when an invalid file
descriptor is provided. Patch by Pascal Chambon.
- Issue #7736: Release the GIL around calls to opendir() and closedir() in the
posix module. Patch by Marcin Bachry.
- Issue #4835: make PyLong_FromSocket_t() and PyLong_AsSocket_t() private to the
socket module, and fix the width of socket descriptors to be correctly
detected under 64-bit Windows.
- Issue #1027206: Support IDNA in gethostbyname, gethostbyname_ex, getaddrinfo
and gethostbyaddr. getnameinfo is now restricted to numeric addresses as
input.
- Issue #9214: Set operations on a KeysView or ItemsView in collections now
correctly return a set. Patch by Eli Bendersky.
- Issue #5737: Add Solaris-specific mnemonics in the errno module. Patch by
Matthew Ahrens.
- Restore GIL in nis_cat in case of error. Decode NIS data to fs encoding, using
the surrogate error handler.
- Issue #665761: ``functools.reduce()`` will no longer mask exceptions other
than ``TypeError`` raised by the iterator argument.
- Issue #9570: Use PEP 383 decoding in os.mknod and os.mkfifo.
- Issue #6915: Under Windows, os.listdir() didn't release the Global Interpreter
Lock around all system calls. Original patch by Ryan Kelly.
- Issue #8524: Add a detach() method to socket objects, so as to put the socket
into the closed state without closing the underlying file descriptor.
- Issue #477863: Emit a ResourceWarning at shutdown if gc.garbage is not empty.
- Issue #6869: Fix a refcount problem in the _ctypes extension.
- Issue #5504: ctypes should now work with systems where mmap can't be
PROT_WRITE and PROT_EXEC.
- Issue #9507: Named tuple repr will now automatically display the right name in
a tuple subclass.
- Issue #9324: Add parameter validation to signal.signal on Windows in order to
prevent crashes.
- Issue #9526: Remove some outdated (int) casts that were preventing the array
module from working correctly with arrays of more than 2**31 elements.
- Fix memory leak in ssl._ssl._test_decode_cert.
- Issue #8065: Fix memory leak in readline module (from failure to free the
result of history_get_history_state()).
- Issue #9450: Fix memory leak in readline.replace_history_item and
readline.remove_history_item for readline version >= 5.0.
- Issue #8105: Validate file descriptor passed to mmap.mmap on Windows.
- Issue #8046: Add context manager protocol support and .closed property to mmap
objects.
Library
-------
- Issue #7451: Improve decoding performance of JSON objects, and reduce the
memory consumption of said decoded objects when they use the same strings as
keys.
- Issue #1100562: Fix deep-copying of objects derived from the list and dict
types. Patch by Michele Orrù and Björn Lindqvist.
- Issue #9753: Fixed socket.dup, which did not always work correctly on Windows.
- Issue #9421: Made the get<type> methods consistently accept the vars and
default arguments on all parser classes.
- Issue #7005: Fixed output of None values for RawConfigParser.write and
ConfigParser.write.
- Issue #8990: array.fromstring() and array.tostring() get renamed to
frombytes() and tobytes(), respectively, to avoid confusion. Furthermore,
array.frombytes(), array.extend() as well as the array.array() constructor now
accept bytearray objects. Patch by Thomas Jollans.
- Issue #808164: Fixed socket.close to avoid references to globals, to avoid
issues when socket.close is called from a __del__ method.
- Issue #9706: ssl module provides a better error handling in various
circumstances.
- Issue #1868: Eliminate subtle timing issues in thread-local objects by getting
rid of the cached copy of thread-local attribute dictionary.
- Issue #1512791: In setframerate() in the wave module, non-integral frame rates
are rounded to the nearest integer.
- Issue #8797: urllib2 does a retry for Basic Authentication failure instead of
falling into recursion.
- Issue #1194222: email.utils.parsedate now returns RFC2822 compliant four
character years even if the message contains RFC822 two character years.
- Issue #8750: Fixed MutableSet's methods to correctly handle reflexive
operations on its self, namely x -= x and x ^= x.
- Issue #9129: smtpd.py is vulnerable to DoS attacks deriving from missing error
handling when accepting a new connection.
- Issue #9601: ftplib now provides a workaround for non-compliant
implementations such as IIS shipped with Windows server 2003 returning invalid
response codes for MKD and PWD commands.
- Issue #658749: asyncore's connect() method now correctly interprets winsock
errors.
- Issue #9501: Fixed logging regressions in cleanup code.
- Fix functools.total_ordering() to skip methods inherited from object.
- Issue #9572: Importlib should not raise an exception if a directory it thought
it needed to create was done concurrently by another process.
- Issue #9617: Signals received during a low-level write operation aren't
ignored by the buffered IO layer anymore.
- Issue #843590: Make "macintosh" an alias to the "mac_roman" encoding.
- Create os.fsdecode(): decode from the filesystem encoding with surrogateescape
error handler, or strict error handler on Windows.
- Issue #3488: Provide convenient shorthand functions ``gzip.compress`` and
``gzip.decompress``. Original patch by Anand B. Pillai.
- Issue #8807: poplib.POP3_SSL class now accepts a context parameter, which is a
ssl.SSLContext object allowing bundling SSL configuration options,
certificates and private keys into a single (potentially long-lived)
structure.
- Issue #8866: parameters passed to socket.getaddrinfo can now be specified as
single keyword arguments.
- Address XXX comment in dis.py by having inspect.py prefer to reuse the dis.py
compiler flag values over defining its own.
- Issue #9147: Added dis.code_info() which is similar to show_code() but returns
formatted code information in a string rather than displaying on screen.
- Issue #9567: functools.update_wrapper now adds a __wrapped__ attribute
pointing to the original callable.
- Issue #3445: functools.update_wrapper now tolerates missing attributes on
wrapped callables.
- Issue #5867: Add abc.abstractclassmethod and abc.abstractstaticmethod.
- Issue #9605: posix.getlogin() decodes the username with file filesystem
encoding and surrogateescape error handler. Patch written by David Watson.
- Issue #9604: posix.initgroups() encodes the username using the fileystem
encoding and surrogateescape error handler. Patch written by David Watson.
- Issue #9603: posix.ttyname() and posix.ctermid() decode the terminal name
using the filesystem encoding and surrogateescape error handler. Patch written
by David Watson.
- Issue #7647: The posix module now has the ST_RDONLY and ST_NOSUID constants,
for use with the statvfs() function. Patch by Adam Jackson.
- Issue #8688: MANIFEST files created by distutils now include a magic comment
indicating they are generated. Manually maintained MANIFESTs without this
marker will not be overwritten or removed.
- Issue #7467: when reading a file from a ZIP archive, its CRC is checked and a
BadZipfile error is raised if it doesn't match (as used to be the case in
Python 2.5 and earlier).
- Issue #9550: a BufferedReader could issue an additional read when the original
read request had been satisfied, which could block indefinitely when the
underlying raw IO channel was e.g. a socket. Report and original patch by
Jason V. Miller.
- Issue #3757: thread-local objects now support cyclic garbage collection.
Thread-local objects involved in reference cycles will be deallocated timely
by the cyclic GC, even if the underlying thread is still running.
- Issue #9452: Add read_file, read_string, and read_dict to the configparser
API; new source attribute to exceptions.
- Issue #6231: Fix xml.etree.ElementInclude to include the tail of the current
node.
- Issue #8047: Fix the xml.etree serializer to return bytes by default. Use
``encoding="unicode"`` to generate a Unicode string.
- Issue #8280: urllib2's Request method will remove fragments in the url. This
is how it is supposed to work, wget and curl do the same. Previous behavior
was wrong.
- Issue #6683: For SMTP logins we now try all authentication methods advertised
by the server. Many servers are buggy and advertise authentication methods
they do not support in reality.
- Issue #8814: function annotations (the ``__annotations__`` attribute) are now
included in the set of attributes copied by default by functools.wraps and
functools.update_wrapper. Patch by Terrence Cole.
- Issue #2944: asyncore doesn't handle connection refused correctly.
- Issue #4184: Private attributes on smtpd.SMTPChannel made public and deprecate
the private attributes. Add tests for smtpd module.
- Issue #3196: email header decoding is now forgiving if an RFC2047 encoded word
encoded in base64 is lacking padding.
- Issue #9444: Argparse now uses the first element of prefix_chars as the option
character for the added 'h/help' option if prefix_chars does not contain a
'-', instead of raising an error.
- Issue #7372: Fix pstats regression when stripping paths from profile data
generated with the profile module.
- Issue #9428: Fix running scripts with the profile/cProfile modules from the
command line.
- Issue #7781: Fix restricting stats by entry counts in the pstats interactive
browser.
- Issue #9209: Do not crash in the pstats interactive browser on invalid regular
expressions.
- Update collections.OrderedDict to match the implementation in Py2.7 (based on
lists instead of weakly referenced Link objects).
- Issue #8397: Raise an error when attempting to mix iteration and regular reads
on a BZ2File object, rather than returning incorrect results.
- Issue #9448: Fix a leak of OS resources (mutexes or semaphores) when
re-initializing a buffered IO object by calling its ``__init__`` method.
- Issue #1713: Fix os.path.ismount(), which returned true for symbolic links
across devices.
- Issue #8826: Properly load old-style "expires" attribute in http.cookies.
- Issue #1690103: Fix initial namespace for code run with trace.main().
- Issue #7395: Fix tracebacks in pstats interactive browser.
- Issue #8230: Fix Lib/test/sortperf.py.
- Issue #8620: when a cmd.Cmd() is fed input that reaches EOF without a final
newline, it no longer truncates the last character of the last command line.
- Issue #5146: Handle UID THREAD command correctly in imaplib.
- Issue #5147: Fix the header generated for cookie files written by
http.cookiejar.MozillaCookieJar.
- Issue #8198: In pydoc, output all help text to the correct stream when
sys.stdout is reassigned.
- Issue #7909: Do not touch paths with the special prefixes ``\\.\`` or ``\\?\``
in ntpath.normpath().
- Issue #1286: Allow using fileinput.FileInput as a context manager.
- Add lru_cache() decorator to the functools module.
Tools/Demos
-----------
- Fix ``Tools/scripts/checkpyc.py`` after PEP 3147.
- Issue #8867: Fix ``Tools/scripts/serve.py`` to work with files containing
non-ASCII content.
Tests
-----
- Issue #9601: Provide a test case for ftplib.parse257.
- Issue #8857: Provide a test case for socket.getaddrinfo.
- Issue #7564: Skip test_ioctl if another process is attached to /dev/tty.
- Issue #8433: Fix test_curses failure with newer versions of ncurses.
- Issue #9496: Provide a test suite for the rlcompleter module. Patch by
Michele Orrù.
- Issue #8687: provide a test suite for sched.py module.
Build
-----
- Issue #1303434: Generate ZIP file containing all PDBs.
- Issue #9193: PEP 3149 is accepted.
- Issue #3101: Helper functions _add_one_to_index_C() and _add_one_to_index_F()
become _Py_add_one_to_index_C() and _Py_add_one_to_index_F(), respectively.
- Issue #9700: define HAVE_BROKEN_POSIX_SEMAPHORES under AIX 6.x. Patch by
Sébastien Sablé.
- Don't run pgen twice when using make -j.
What's New in Python 3.2 Alpha 1?
=================================
*Release date: 01-Aug-2010*
Core and Builtins
-----------------
- Issue #8991: convertbuffer() rejects discontigious buffers.
- Issue #7616: Fix copying of overlapping memoryview slices with the Intel
compiler.
- Issue #8413: structsequence now subclasses tuple.
- Issue #8271: during the decoding of an invalid UTF-8 byte sequence, only the
start byte and the continuation byte(s) are now considered invalid, instead of
the number of bytes specified by the start byte. E.g.:
'\xf1\x80AB'.decode('utf-8', 'replace') now returns u'\ufffdAB' and replaces
with U+FFFD only the start byte ('\xf1') and the continuation byte ('\x80')
even if '\xf1' is the start byte of a 4-bytes sequence. Previous versions
returned a single u'\ufffd'.
- Issue #9011: A negated imaginary literal (e.g., "-7j") now has real part -0.0
rather than 0.0. So "-7j" is now exactly equivalent to "-(7j)".
- Be more specific in error messages about positional arguments.
- Issue #8949: "z" format of PyArg_Parse*() functions doesn't accept bytes
objects, as described in the documentation.
- Issue #6543: Write the traceback in the terminal encoding instead of utf-8.
Fix the encoding of the modules filename. Patch written by Amaury Forgeot
d'Arc.
- Issue #9011: Remove buggy and unnecessary (in 3.x) ST->AST compilation code
dealing with unary minus applied to a constant. The removed code was mutating
the ST, causing a second compilation to fail.
- Issue #850997: mbcs encoding (Windows only) handles errors argument: strict
mode raises unicode errors. The encoder only supports "strict" and "replace"
error handlers, the decoder only supports "strict" and "ignore" error
handlers. Patch written by Mark Hammond.
- Issue #8850: Remove "w" and "w#" formats from PyArg_Parse*() functions, use
"w*" format instead. Add tests for "w*" format.
- Issue #8592: PyArg_Parse*() functions raise a TypeError for "y", "u" and "Z"
formats if the string contains a null byte/character. Write unit tests for
string formats.
- Issue #7490: To facilitate sharing of doctests between 2.x and 3.x test
suites, the IGNORE_EXCEPTION_DETAIL directive now also ignores the module
location of the raised exception.
- Issue #8969: On Windows, use mbcs codec in strict mode to encode and decode
filenames and enable os.fsencode().
- Issue #9058: Remove assertions about INT_MAX in UnicodeDecodeError.
- Issue #8941: Decoding big endian UTF-32 data in UCS-2 builds could crash the
interpreter with characters outside the Basic Multilingual Plane (higher than
0x10000).
- Issue #8950: (See also issue #5080). Py_ArgParse*() functions now raise
TypeError instead of giving a DeprecationWarning when a float is parsed using
the 'L' code (for long long). (All other integer codes already raise
TypeError in this case.)
- Issue #8922: Normalize the encoding name in PyUnicode_AsEncodedString() to
enable shortcuts for upper case encoding name. Add also a shortcut for
"iso-8859-1" in PyUnicode_AsEncodedString() and PyUnicode_Decode().
- Issue #8838: Remove codecs.charbuffer_encode() function. The buffer protocol
doesn't support "char buffer" anymore in Python 3.
- Issue #8339: Remove "t#" format of PyArg_Parse*() functions, use "s#" or "s*"
instead. codecs.charbuffer_encode() now accepts modifiable buffer objects
like bytearray.
- Issue #8837: Remove "O?" format of PyArg_Parse*() functions. The format is no
used anymore and it was never documented.
- In str.format(), raise a ValueError when indexes to arguments are too large.
- Issue #2844: Make int('42', n) consistently raise ValueError for invalid
integers n (including n = -909).
- Issue #8188: Introduce a new scheme for computing hashes of numbers (instances
of int, float, complex, decimal.Decimal and fractions.Fraction) that makes it
easy to maintain the invariant that hash(x) == hash(y) whenever x and y have
equal value.
- Issue #8748: Fix two issues with comparisons between complex and integer
objects. (1) The comparison could incorrectly return True in some cases
(2**53+1 == complex(2**53) == 2**53), breaking transitivity of equality.
(2) The comparison raised an OverflowError for large integers, leading to
unpredictable exceptions when combining integers and complex objects in sets
or dicts.
- Issue #8766: Initialize _warnings module before importing the first module.
Fix a crash if an empty directory called "encodings" exists in sys.path.
- Issue #8589: Decode PYTHONWARNINGS environment variable with the file system
encoding and surrogateescape error handler instead of the locale encoding to
be consistent with os.environ. Add PySys_AddWarnOptionUnicode() function.
- PyObject_Dump() encodes unicode objects to utf8 with backslashreplace (instead
of strict) error handler to escape surrogates.
- Issue #8715: Create PyUnicode_EncodeFSDefault() function: Encode a Unicode
object to Py_FileSystemDefaultEncoding with the "surrogateescape" error
handler, and return bytes. If Py_FileSystemDefaultEncoding is not set, fall
back to UTF-8.
- Enable shortcuts for common encodings in PyUnicode_AsEncodedString() for any
error handler, not only the default error handler (strict).
- Issue #8610: Load file system codec at startup, and display a fatal error on
failure. Set the file system encoding to utf-8 (instead of None) if getting
the locale encoding failed, or if nl_langinfo(CODESET) function is missing.
- PyFile_FromFd() uses PyUnicode_DecodeFSDefault() instead of
PyUnicode_FromString() to support surrogates in the filename and use the right
encoding.
- Issue #7507: Quote "!" in pipes.quote(); it is special to some shells.
- PyUnicode_DecodeFSDefaultAndSize() uses surrogateescape error handler.
- Issue #8419: Prevent the dict constructor from accepting non-string keyword
arguments.
- Issue #8124: PySys_WriteStdout() and PySys_WriteStderr() don't execute
indirectly Python signal handlers anymore because mywrite() ignores exceptions
(KeyboardInterrupt).
- Issue #8092: Fix PyUnicode_EncodeUTF8() to support error handler producing
unicode string (eg. backslashreplace).
- Issue #8485: PyUnicode_FSConverter() doesn't accept byteearray objects
anymore, you have to convert your bytearray filenames to bytes.
- Issue #7332: Remove the 16KB stack-based buffer in
PyMarshal_ReadLastObjectFromFile, which doesn't bring any noticeable benefit
compared to the dynamic memory allocation fallback. Patch by Charles-François
Natali.
- Issue #8417: Raise an OverflowError when an integer larger than sys.maxsize is
passed to bytes or bytearray.
- Issue #7301: Add environment variable $PYTHONWARNINGS.
- Issue #8329: Don't return the same lists from select.select when no fds are
changed.
- Issue #8259: 1L << (2**31) no longer produces an 'outrageous shift error' on
64-bit machines. The shift count for either left or right shift is permitted
to be up to sys.maxsize.
- Ensure that tokenization of identifiers is not affected by locale.
- Issue #1222585: Added LDCXXSHARED for C++ support. Patch by Arfrever.
- Raise a TypeError when trying to delete a T_STRING_INPLACE struct member.
- Issue #8211: Save/restore CFLAGS around AC_PROG_CC in configure.in, in case it
is set.
- Issue #8226: sys.setfilesystemencoding() raises a LookupError if the encoding
is unknown.
- Issue #1583863: A str subclass can now override the __str__ method.
- Issue #8014: Setting a T_UINT or T_PYSSIZET attribute of an object with
PyMemberDefs could produce an internal error; raise TypeError instead.
- Issue #7845: Rich comparison methods on the complex type now return
NotImplemented rather than raising a TypeError when comparing with an
incompatible type; this allows user-defined classes to implement their own
comparisons with complex.
- Issue #3137: Don't ignore errors at startup, especially a keyboard interrupt
(SIGINT). If an error occurs while importing the site module, the error is
printed and Python exits. Initialize the GIL before importing the site module.
- Issue #7173: Generator finalization could invalidate sys.exc_info().
- Issue #7544: Preallocate thread memory before creating the thread to avoid a
fatal error in low memory condition.
- Issue #7820: The parser tokenizer restores all bytes in the right if the BOM
check fails.
- Handle errors from looking up __prepare__ correctly.
- Issue #5939: Add additional runtime checking to ensure a valid capsule in
Modules/_ctypes/callproc.c.
- Issue #7309: Fix unchecked attribute access when converting
UnicodeEncodeError, UnicodeDecodeError, and UnicodeTranslateError to strings.
- Issue #6902: Fix problem with built-in types format incorrectly with 0
padding.
- Issue #7988: Fix default alignment to be right aligned for complex.__format__.
Now it matches other numeric types.
- Issue #5988: Remove deprecated functions PyOS_ascii_formatd,
PyOS_ascii_strtod, and PyOS_ascii_atof. Use PyOS_double_to_string and
PyOS_string_to_double instead. See issue #5835 for the original deprecations.
- Issue #7385: Fix a crash in `MemoryView_FromObject` when `PyObject_GetBuffer`
fails. Patch by Florent Xicluna.
- Issue #7788: Fix an interpreter crash produced by deleting a list slice with
very large step value.
- Issue #7766: Change sys.getwindowsversion() return value to a named tuple and
add the additional members returned in an OSVERSIONINFOEX structure. The new
members are service_pack_major, service_pack_minor, suite_mask, and
product_type.
- Issue #7561: Operations on empty bytearrays (such as `int(bytearray())`) could
crash in many places because of the PyByteArray_AS_STRING() macro returning
NULL. The macro now returns a statically allocated empty string instead.
- Issue #6690: Optimize the bytecode for expressions such as `x in {1, 2, 3}`,
where the right hand operand is a set of constants, by turning the set into a
frozenset and pre-building it as a constant. The comparison operation is made
against the constant instead of building a new set each time it is executed (a
similar optimization already existed which turned a list of constants into a
pre-built tuple). Patch and additional tests by Dave Malcolm.
- Issue #7622: Improve the split(), rsplit(), splitlines() and replace() methods
of bytes, bytearray and unicode objects by using a common implementation based
on stringlib's fast search. Patch by Florent Xicluna.
- Issue #7632: Fix various str -> float conversion bugs present in 2.7 alpha 2,
including: (1) a serious 'wrong output' bug that could occur for long (> 40
digit) input strings, (2) a crash in dtoa.c that occurred in debug builds when
parsing certain long numeric strings corresponding to subnormal values, (3) a
memory leak for some values large enough to cause overflow, and (4) a number
of flaws that could lead to incorrectly rounded results.
- The __complex__ method is now looked up on the class of instances to make it
consistent with other special methods.
- Issue #7462: Implement the stringlib fast search algorithm for the `rfind`,
`rindex`, `rsplit` and `rpartition` methods. Patch by Florent Xicluna.
- Issue #7604: Deleting an unset slotted attribute did not raise an
AttributeError.
- Issue #7534: Fix handling of IEEE specials (infinities, nans, negative zero)
in ** operator. The behaviour now conforms to that described in C99 Annex F.
- Issue #1811: improve accuracy and cross-platform consistency for true division
of integers: the result of a/b is now correctly rounded for ints a and b (at
least on IEEE 754 platforms), and in particular does not depend on the
internal representation of an int.
- Issue #6834: replace the implementation for the 'python' and 'pythonw'
executables on OSX.
These executables now work properly with the arch(1) command: ``arch -ppc
python`` will start a universal binary version of python in PPC mode (unlike
previous releases).
- Issue #7466: Segmentation fault when the garbage collector is called in the
middle of populating a tuple. Patch by Florent Xicluna.
- Issue #7419: setlocale() could crash the interpreter on Windows when called
with invalid values.
- Issue #6077: On Windows, files opened with tempfile.TemporaryFile in "wt+"
mode would appear truncated on the first '0x1a' byte (aka. Ctrl+Z).
- Issue #7085: Fix crash when importing some extensions in a thread on MacOSX
10.6.
- Issue #1757126: Fix the cyrillic-asian alias for the ptcp154 encoding.
- Issue #6970: Remove redundant calls when comparing objects that don't
implement the relevant rich comparison methods.
- Issue #7298: Fixes for range and reversed(range(...)). Iteration over
range(a, b, c) incorrectly gave an empty iterator when a, b and c fit in C
long but the length of the range did not. Also fix several cases where
reversed(range(a, b, c)) gave wrong results, and fix a refleak for
reversed(range(a, b, c)) with large arguments.
- Issue #7244: itertools.izip_longest() no longer ignores exceptions raised
during the formation of an output tuple.
- Issue #3297: On wide unicode builds, do not split unicode characters into
surrogates.
- Remove length limitation when constructing a complex number from a string.
- Issue #1087418: Boost performance of bitwise operations for longs.
- Support for AtheOS has been completely removed from the code base. It was
disabled since Python 3.0.
- Support for several legacy threading libraries has been disabled. These
libraries are: Mach C threads, SunOS LWP, GNU pth, Irix threads. Support code
will be entirely removed in 3.3.
- Support for OSF* has been disabled. If nobody stands up, support will be
removed in 3.3. See <http://bugs.python.org/issue8606>.
- Peephole constant folding had missed UNARY_POSITIVE.
- Issue #1722344: threading._shutdown() is now called in Py_Finalize(), which
fixes the problem of some exceptions being thrown at shutdown when the
interpreter is killed. Patch by Adam Olsen.
- Issue #7147: Remove support for compiling Python without complex number
support.
- Issue #7120: logging: Removed import of multiprocessing which is causing crash
in GAE.
- Issue #1754094: Improve the stack depth calculation in the compiler. There
should be no other effect than a small decrease in memory use. Patch by
Christopher Tur Lesniewski-Laas.
- Issue #7065: Fix a crash in bytes.maketrans and bytearray.maketrans when using
byte values greater than 127. Patch by Derk Drukker.
- Issue #1571184: The Unicode database contains properties for more characters.
The tables for code points representing numeric values, white spaces or line
breaks are now generated from the official Unicode Character Database files,
and include information from the Unihan.txt file.
- Issue #7019: Raise ValueError when unmarshalling bad long data, instead of
producing internally inconsistent Python longs.
- Issue #6990: Fix threading.local subclasses leaving old state around after a
reference cycle GC which could be recycled by new locals.
- Issue #5460: Fix an ambiguity in the grammar.
- Issue #1766304: Improve performance of membership tests on range objects.
- Issue #6713: Improve performance of integer -> string conversions.
- Issue #6846: Fix bug where bytearray.pop() returns negative integers.
- Issue #6750: A text file opened with io.open() could duplicate its output when
writing from multiple threads at the same time.
- Issue #6707: dir() on an uninitialized module caused a crash.
- Issue #6540: Fixed crash for bytearray.translate() with invalid parameters.
- Issue #6573: set.union() stopped processing inputs if an instance of self
occurred in the argument chain.
- Issue #6070: On posix platforms import no longer copies the execute bit from
the .py file to the .pyc file if it is set.
- Issue #1616979: Added the cp720 (Arabic DOS) encoding.
- Issue #6428: Since Python 3.0, the __bool__ method must return a bool object,
and not an int. Fix the corresponding error message, and the documentation.
- The deprecated PyCObject has been removed.
- Issue #6347: Include inttypes.h as well as stdint.h in pyport.h. This fixes a
build failure on HP-UX: int32_t and uint32_t are defined in inttypes.h instead
of stdint.h on that platform.
- Issue #6373: Fixed a SystemError when encoding with the latin-1 codec and the
'surrogateescape' error handler, a string which contains unpaired surrogates.
- Issue #4856: Remove checks for win NT.
- Issue #6687: PyBytes_FromObject() no longer accepts an integer as its argument
to construct a null-initialized bytes object.
- Issue #1023290: Add from_bytes() and to_bytes() methods to integers. These
methods allow the conversion of integers to bytes, and vice-versa.
- Issue #7382: Fix bug in bytes.__getnewargs__ that prevented bytes instances
from being copied with copy.copy(), and bytes subclasses from being pickled
properly.
- Code objects now support weak references.
- Issue #7072: isspace(0xa0) is true on Mac OS X.
- Issue #8084: PEP 370 now conforms to system conventions for framework builds
on MacOS X. That is, "python setup.py install --user" will install into
"~/Library/Python/2.7" instead of "~/.local".
C-API
-----
- Issue #2443: A new macro, `Py_VA_COPY`, copies the state of the
variable argument list. `Py_VA_COPY` is equivalent to C99
`va_copy`, but available on all python platforms.
- PySlice_GetIndicesEx now clips the step to [-PY_SSIZE_T_MAX, PY_SSIZE_T_MAX]
instead of [-PY_SSIZE_T_MAX-1, PY_SSIZE_T_MAX]. This makes it safe to do
"step = -step" when reversing a slice.
- Issue #5753: A new C API function, `PySys_SetArgvEx`, allows embedders of the
interpreter to set sys.argv without also modifying sys.path. This helps fix
`CVE-2008-5983
<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5983>`_.
- Add PyArg_ValidateKeywordArguments, which checks if all keyword arguments are
strings in an efficient manner.
- Issue #8276: PyEval_CallObject() is now only available in macro form. The
function declaration, which was kept for backwards compatibility reasons, is
now removed (the macro was introduced in 1997!).
- Issue #7767: New function PyLong_AsLongLongAndOverflow added, analogous to
PyLong_AsLongAndOverflow.
- Make PyUnicode_CompareWithASCIIString return not equal if the Python string
has '\0' at the end.
- Issue #5080: The argument parsing functions PyArg_ParseTuple,
PyArg_ParseTupleAndKeywords, PyArg_VaParse, PyArg_VaParseTupleAndKeywords and
PyArg_Parse now raise a DeprecationWarning for float arguments passed with the
'L' format code. This will become a TypeError in a future version of Python,
to match the behaviour of the other integer format codes.
- Issue #7033: Function ``PyErr_NewExceptionWithDoc()`` added.
- Issue #7414: 'C' code wasn't being skipped properly (for keyword arguments) in
PyArg_ParseTupleAndKeywords.
- Issue #7228: Add '%lld' and '%llu' support to PyString_FromFormat(V) and
PyErr_Format, on machines with HAVE_LONG_LONG defined.
- Issue #6151: Made PyDescr_COMMON conform to standard C (like PyObject_HEAD in
PEP 3123). The PyDescr_TYPE and PyDescr_NAME macros should be should used for
accessing the d_type and d_name members of structures using PyDescr_COMMON.
- Issue #6405: Remove duplicate type declarations in descrobject.h.
- The code flags for old __future__ features are now available again.
- Issue #5954: Add a PyFrame_GetLineNumber() function to replace most uses of
PyCode_Addr2Line().
- Issue #5959: Add a PyCode_NewEmpty() function to create a new empty code
object at a specified file, function, and line number.
- Issue #1419652: Change the first argument to PyImport_AppendInittab() to
``const char *`` as the string is stored beyond the call.
- Issue #2422: When compiled with the ``--with-valgrind`` option, the pymalloc
allocator will be automatically disabled when running under Valgrind. This
gives improved memory leak detection when running under Valgrind, while taking
advantage of pymalloc at other times.
Library
-------
- In pdb, when Ctrl-C is entered while defining commands for a breakpoint, the
old commands are restored.
- For traceback debugging, the pdb listing now also shows the locations where
the exception was originally (re)raised, if it differs from the last line
executed (e.g. in case of finally clauses).
- The pdb command "source" has been added. It displays the source code for a
given object, if possible.
- The pdb command "longlist" has been added. It displays the whole source code
for the current function.
- Issue #1503502: Make pdb.Pdb easier to subclass by putting message and error
output into methods.
- Issue #809887: Make the output of pdb's breakpoint deletions more consistent;
emit a message when a breakpoint is enabled or disabled.
- Issue #5294: Fix the behavior of pdb's "continue" command when called in the
top-level debugged frame.
- Issue #5727: Restore the ability to use readline when calling into pdb in
doctests.
- Issue #6719: In pdb, do not stop somewhere in the encodings machinery if the
source file to be debugged is in a non-builtin encoding.
- Issue #8048: Prevent doctests from failing when sys.displayhook has been
reassigned.
- Issue #8015: In pdb, do not crash when an empty line is entered as a
breakpoint command.
- In pdb, allow giving a line number to the "until" command.
- Issue #1437051: For pdb, allow "continue" and related commands in .pdbrc
files. Also, add a command-line option "-c" that runs a command as if given
in .pdbrc.
- Issue #4179: In pdb, allow "list ." as a command to return to the currently
debugged line.
- Issue #4108: In urllib.robotparser, if there are multiple ``User-agent: *``
entries, consider the first one.
- Issue #6630: Allow customizing regex flags when subclassing the
string.Template class.
- Issue #9411: Allow specifying an encoding for config files in the configparser
module.
- Issue #1682942: Improvements to configparser: support alternate delimiters,
alternate comment prefixes and empty lines in values.
- Issue #9354: Provide getsockopt() in asyncore's file_wrapper.
- Issue #8966: ctypes: Remove implicit bytes-unicode conversion.
- Issue #9378: python -m pickle <pickle file> will now load and display the
first object in the pickle file.
- Issue #4770: Restrict binascii module to accept only bytes (as specified).
And fix the email package to encode to ASCII instead of ``raw-unicode-escape``
before ASCII-to-binary decoding.
- Issue #9384: ``python -m tkinter`` will now display a simple demo applet.
- The default size of the re module's compiled regular expression cache has been
increased from 100 to 500 and the cache replacement policy has changed from
simply clearing the entire cache on overflow to forgetting the least recently
used cached compiled regular expressions. This is a performance win for
applications that use a lot of regular expressions and limits the impact of
the performance hit anytime the cache is exceeded.
- Issue #7113: Speed up loading in configparser. Patch by Łukasz Langa.
- Issue #9032: XML-RPC client retries the request on EPIPE error. The EPIPE
error occurs when the server closes the socket and the client sends a big
XML-RPC request.
- Issue #4629: getopt raises an error if an argument ends with "=", whereas
getopt doesn't accept a value (eg. --help= is rejected if getopt uses
['help='] long options).
- Issue #7989: Added pure python implementation of the `datetime` module. The C
module is renamed to `_datetime` and if available, overrides all classes
defined in datetime with fast C impementation. Python implementation is based
on the original python prototype for the datetime module by Tim Peters with
minor modifications by the PyPy project. The test suite now tests `datetime`
module with and without `_datetime` acceleration using the same test cases.
- Issue #7895: platform.mac_ver() no longer crashes after calling os.fork().
- Issue #9323: Fixed a bug in trace.py that resulted in loosing the name of the
script being traced. Patch by Eli Bendersky.
- Issue #9282: Fixed --listfuncs option of trace.py. Thanks Eli Bendersky for
the patch.
- Issue #3704: http.cookiejar was not properly handling URLs with a / in the
parameters.
- Issue #9268: ``pickletools.dis()`` now has an optional *annotate* argument
which controls printing of opcode descriptions in ``dis()`` output.
- Issue #1555570: email no longer inserts extra blank lines when a \r\n combo
crosses an 8192 byte boundary.
- Issue #9243: Fix sndhdr module and add unit tests, contributed by James Lee.
- ``ast.literal_eval()`` now allows byte literals.
- Issue #9137: Fix issue in MutableMapping.update, which incorrectly treated
keyword arguments called 'self' or 'other' specially.
- ``ast.literal_eval()`` now allows set literals.
- Issue #9164: Ensure that sysconfig handles duplicate -arch flags in CFLAGS.
- Issue #7646: The fnmatch pattern cache no longer grows without bound.
- Issue #9136: Fix 'dictionary changed size during iteration' RuntimeError
produced when profiling the decimal module. This was due to a dangerous
iteration over 'locals()' in Context.__init__.
- Fix extreme speed issue in Decimal.pow when the base is an exact power of 10
and the exponent is tiny (for example, ``Decimal(10) **
Decimal('1e-999999999')``).
- Issue #9186: Fix math.log1p(-1.0) to raise ValueError, not OverflowError.
- Issue #9130: Fix validation of relative imports in parser module.
- Issue #9128: Fix validation of class decorators in parser module.
- Issue #9094: python -m pickletools will now disassemble pickle files listed in
the command line arguments. See output of python -m pickletools -h for more
details.
- Issue #5468: urlencode to handle bytes type and other encodings in its query
parameter. Patch by Dan Mahn.
- Issue #7673: Fix security vulnerability (CVE-2010-2089) in the audioop module,
ensure that the input string length is a multiple of the frame size.
- Issue #6507: Accept source strings in dis.dis(). Original patch by Daniel
Urban.
- Issue #7829: Clearly document that the dis module is exposing an
implementation detail that is not stable between Python VMs or releases.
- Issue #6589: cleanup asyncore.socket_map in case smtpd.SMTPServer constructor
raises an exception.
- Issue #9110: Addition of ContextDecorator to contextlib, for creating APIs
that act as both context managers and decorators. contextmanager changes to
use ContextDecorator.
- Implement importlib.abc.SourceLoader and deprecate PyLoader and PyPycLoader
for removal in Python 3.4.
- Issue #9064: pdb's "up" and "down" commands now accept an optional argument
giving the number of frames to go.
- Issue #9018: os.path.normcase() now raises a TypeError if the argument is not
``str`` or ``bytes``.
- Issue #9075: In the ssl module, remove the setting of a ``debug`` flag on an
OpenSSL structure.
- Issue #8682: The ssl module now temporary increments the reference count of a
socket object got through ``PyWeakref_GetObject``, so as to avoid possible
deallocation while the object is still being used.
- Issue #1368368: FancyURLOpener class changed to throw an Exception on wrong
password instead of presenting an interactive prompt. Older behavior can be
obtained by passing retry=True to http_error_xxx methods of FancyURLOpener.
- Issue #8720: Fix regression caused by fix for #4050 by making getsourcefile
smart enough to find source files in the linecache.
- Issue #5610: feedparser no longer eats extra characters at the end of a body
part if the body part ends with a ``\r\n``.
- Issue #8986: math.erfc was incorrectly raising OverflowError for values
between -27.3 and -30.0 on some platforms.
- Issue #8784: Set tarfile default encoding to 'utf-8' on Windows.
- Issue #8966: If a ctypes structure field is an array of c_char, convert its
value to bytes instead of str (as done for c_char and c_char_p).
- Issue #8188: Comparisons between Decimal and Fraction objects are now
permitted, returning a result based on the exact numerical values of the
operands. This builds on issue #2531, which allowed Decimal-to-float
comparisons; all comparisons involving numeric types (bool, int, float,
complex, Decimal, Fraction) should now act as expected.
- Issue #8897: Fix sunau module, use bytes to write the header. Patch written by
Thomas Jollans.
- Issue #8899: time.struct_time now has class and attribute docstrings.
- Issue #6470: Drop UNC prefix in FixTk.
- Issue #4768: base64 encoded email body parts were incorrectly stored as binary
strings. They are now correctly converted to strings.
- Issue #8833: tarfile created hard link entries with a size field != 0 by
mistake.
- Charset.body_encode now correctly handles base64 encoding by encoding with the
output_charset before calling base64mime.encode. Passes the tests from 2.x
issue #1368247.
- Issue #8845: sqlite3 Connection objects now have a read-only in_transaction
attribute that is True iff there are uncommitted changes.
- Issue #1289118: datetime.timedelta objects can now be multiplied by float and
divided by float and int objects. Results are rounded to the nearest multiple
of timedelta.resolution with ties resolved using round-half-to-even method.
- Issue #7150: Raise OverflowError if the result of adding or subtracting
timedelta from date or datetime falls outside of the MINYEAR:MAXYEAR range.
- Issue #8806: add SSL contexts support to ftplib.
- Issue #4769: Fix main() function of the base64 module, use sys.stdin.buffer
and sys.stdout.buffer (instead of sys.stdin and sys.stdout) to use the bytes
API.
- Issue #8770: Now sysconfig displays information when it's called as a script.
Initial idea by Sridhar Ratnakumar.
- Issue #6662: Fix parsing of malformatted charref (&#bad;), patch written by
Fredrik Håård.
- Issue #8540: Decimal module: rename the Context._clamp attribute to
Context.clamp and make it public. This is useful in creating contexts that
correspond to the decimal interchange formats specified in IEEE 754.
- Issue #6268: Fix seek() method of codecs.open(), don't read or write the BOM
twice after seek(0). Fix also reset() method of codecs, UTF-16, UTF-32 and
StreamWriter classes.
- Issue #3798: sys.exit(message) writes the message to sys.stderr file, instead
of the C file stderr, to use stderr encoding and error handler.
- Issue #8782: Add a trailing newline in linecache.updatecache to the last line
of files without one.
- Issue #8729: Return NotImplemented from collections.Mapping.__eq__ when
comparing to a non-mapping.
- Issue #8774: tabnanny uses the encoding cookie (#coding:...) to use the
correct encoding.
- Issue #4870: Add an `options` attribute to SSL contexts, as well as several
``OP_*`` constants to the `ssl` module. This allows to selectively disable
protocol versions, when used in combination with `PROTOCOL_SSLv23`.
- Issue #8759: Fixed user paths in sysconfig for posix and os2 schemes.
- Issue #8663: distutils.log emulates backslashreplace error handler. Fix
compilation in a non-ASCII directory if stdout encoding is ASCII (eg. if
stdout is not a TTY).
- Issue #8513: os.get_exec_path() supports b'PATH' key and bytes value.
subprocess.Popen() and os._execvpe() support bytes program name. Add
os.supports_bytes_environ flag: True if the native OS type of the environment
is bytes (eg. False on Windows).
- Issue #8633: tarfile is now able to read and write archives with "raw" binary
pax headers as described in POSIX.1-2008.
- Issue #1285086: Speed up urllib.parse functions: quote, quote_from_bytes,
unquote, unquote_to_bytes.
- Issue #8688: Distutils now recalculates MANIFEST everytime.
- Issue #8477: ssl.RAND_egd() and ssl._test_decode_cert() support str with
surrogates and bytes for the filename.
- Issue #8550: Add first class ``SSLContext`` objects to the ssl module.
- Issue #8681: Make the zlib module's error messages more informative when the
zlib itself doesn't give any detailed explanation.
- The audioop module now supports sound fragments of length greater than 2**31
bytes on 64-bit machines, and is PY_SSIZE_T_CLEAN.
- Issue #4972: Add support for the context manager protocol to the ftplib.FTP
class.
- Issue #8664: In py_compile, create __pycache__ when the compiled path is
given.
- Issue #8514: Add os.fsencode() function (Unix only): encode a string to bytes
for use in the file system, environment variables or the command line.
- Issue #8571: Fix an internal error when compressing or decompressing a chunk
larger than 1GB with the zlib module's compressor and decompressor objects.
- Issue #8603: Support bytes environmental variables on Unix: Add os.environb
mapping and os.getenvb() function. os.unsetenv() encodes str argument to the
file system encoding with the surrogateescape error handler (instead of
utf8/strict) and accepts bytes. posix.environ keys and values are now bytes.
- Issue #8573: asyncore _strerror() function might throw ValueError.
- Issue #8483: asyncore.dispatcher's __getattr__ method produced confusing error
messages when accessing undefined class attributes because of the cheap
inheritance with the underlying socket object. The cheap inheritance has been
deprecated.
- Issue #4265: shutil.copyfile() was leaking file descriptors when disk fills.
Patch by Tres Seaver.
- Issue #8390: tarfile uses surrogateescape as the default error handler
(instead of replace in read mode or strict in write mode).
- Issue #7755: Use an unencumbered audio file for tests.
- Issue #8621: uuid.uuid4() returned the same sequence of values in the parent
and any children created using ``os.fork`` on MacOS X 10.6.
- Issue #8567: Fix precedence of signals in Decimal module: when a Decimal
operation raises multiple signals and more than one of those signals is
trapped, the specification determines the order in which the signals should be
handled. In many cases this order wasn't being followed, leading to the wrong
Python exception being raised.
- Issue #7865: The close() method of :mod:`io` objects should not swallow
exceptions raised by the implicit flush(). Also qensure that calling close()
several times is supported. Patch by Pascal Chambon.
- Issue #4687: Fix accuracy of garbage collection runtimes displayed with
gc.DEBUG_STATS.
- Issue #8354: The siginterrupt setting is now preserved for all signals, not
just SIGCHLD.
- Issue #7192: webbrowser.get("firefox") now works on Mac OS X, as does
webbrowser.get("safari").
- Issue #8464: tarfile no longer creates files with execute permissions set when
mode="w|" is used.
- Issue #7834: Fix connect() of Bluetooth L2CAP sockets with recent versions of
the Linux kernel. Patch by Yaniv Aknin.
- Issue #8295: Added shutil.unpack_archive.
- Issue #6312: Fixed http HEAD request when the transfer encoding is chunked.
It should correctly return an empty response now.
- Issue #8546: Reject None given as the buffering argument to _pyio.open.
- Issue #8549: Fix compiling the _ssl extension under AIX. Patch by
Sridhar Ratnakumar.
- Issue #6656: fix locale.format_string to handle escaped percents
and mappings.
- Issue #2302: Fix a race condition in SocketServer.BaseServer.shutdown, where
the method could block indefinitely if called just before the event loop
started running. This also fixes the occasional freezes witnessed in
test_httpservers.
- Issue #8524: When creating an SSL socket, the timeout value of the original
socket wasn't retained (instead, a socket with a positive timeout would be
turned into a non-blocking SSL socket).
- Issue #5103: SSL handshake would ignore the socket timeout and block
indefinitely if the other end didn't respond.
- The do_handshake() method of SSL objects now adjusts the blocking mode of the
SSL structure if necessary (as other methods already do).
- Issue #8391: os.execvpe() and os.getenv() supports unicode with surrogates and
bytes strings for environment keys and values.
- Issue #8467: Pure Python implementation of subprocess encodes the error
message using surrogatepass error handler to support surrogates in the
message.
- Issue #8468: bz2.BZ2File() accepts str with surrogates and bytes filenames.
- Issue #8451: Syslog module now uses basename(sys.argv[0]) instead of the
string "python" as the *ident*. openlog() arguments are all optional and
keywords.
- Issue #8108: Fix the unwrap() method of SSL objects when the socket has a
non-infinite timeout. Also make that method friendlier with applications
wanting to continue using the socket in clear-text mode, by disabling
OpenSSL's internal readahead. Thanks to Darryl Miles for guidance.
- Issue #8496: make mailcap.lookup() always return a list, rather than an
iterator. Patch by Gregory Nofi.
- Issue #8195: Fix a crash in sqlite Connection.create_collation() if the
collation name contains a surrogate character.
- Issue #8484: Load all ciphers and digest algorithms when initializing the _ssl
extension, such that verification of some SSL certificates doesn't fail
because of an "unknown algorithm".
- Issue #6547: Added the ignore_dangling_symlinks option to shutil.copytree.
- Issue #1540112: Now allowing the choice of a copy function in shutil.copytree.
- Issue #4814: timeout parameter is now applied also for connections resulting
from PORT/EPRT commands.
- Issue #8463: added missing reference to bztar in shutil's documentation.
- Issue #7154: urllib.request can now detect the proxy settings on OSX 10.6 (as
long as the user didn't specify 'automatic proxy configuration').
- Issue #3817: ftplib.FTP.abort() method now considers 225 a valid response code
as stated in RFC-959 at chapter 5.4.
- Issue #8394: _ctypes.dlopen() accepts bytes, bytearray and str with
surrogates.
- Issue #850728: Add a *timeout* parameter to the `acquire()` method of
`threading.Semaphore` objects. Original patch by Torsten Landschoff.
- Issue #8322: Add a *ciphers* argument to SSL sockets, so as to change the
available cipher list. Helps fix test_ssl with OpenSSL 1.0.0.
- Issue #8393: subprocess accepts bytes, bytearray and str with surrogates for
the current working directory.
- Issue #7606: XML-RPC traceback stored in X-traceback is now encoded to ASCII
using backslashreplace error handler.
- Issue #8412: os.system() now accepts bytes, bytearray and str with surrogates.
- Issue #2987: RFC2732 support for urlparse (IPv6 addresses). Patch by Tony
Locke and Hans Ulrich Niedermann.
- Issue #5277: Fix quote counting when parsing RFC 2231 encoded parameters.
- Issue #7316: The acquire() method of lock objects in the :mod:`threading`
module now takes an optional timeout argument in seconds. Timeout support
relies on the system threading library, so as to avoid a semi-busy wait loop.
- Issue #8383: pickle and pickletools use surrogatepass error handler when
encoding unicode as utf8 to support lone surrogates and stay compatible with
Python 2.x and 3.x.
- Issue #7585: difflib context and unified diffs now place a tab between
filename and date, conforming to the 'standards' they were originally designed
to follow. This improves compatibility with patch tools.
- Issue #7472: Fixed typo in email.encoders module; messages using ISO-2022
character sets will now consistently use a Content-Transfer-Encoding of 7bit
rather than sometimes being marked as 8bit.
- Issue #8375: test_distutils now checks if the temporary directory are still
present before it cleans them.
- Issue #8374: Update the internal alias table in the :mod:`locale` module to
cover recent locale changes and additions.
- Issue #8321: Give access to OpenSSL version numbers from the `ssl` module,
using the new attributes `ssl.OPENSSL_VERSION`, `ssl.OPENSSL_VERSION_INFO` and
`ssl.OPENSSL_VERSION_NUMBER`.
- Add functools.total_ordering() and functools.cmp_to_key().
- Issue #8257: The Decimal construct now accepts a float instance directly,
converting that float to a Decimal of equal value:
>>> Decimal(1.1)
Decimal('1.100000000000000088817841970012523233890533447265625')
- Issue #8294: The Fraction constructor now accepts Decimal and float instances
directly.
- Issue #7279: Comparisons involving a Decimal signaling NaN now signal
InvalidOperation instead of returning False. (Comparisons involving a quiet
NaN are unchanged.) Also, Decimal quiet NaNs are now hashable; Decimal
signaling NaNs remain unhashable.
- Issue #2531: Comparison operations between floats and Decimal instances now
return a result based on the numeric values of the operands; previously they
returned an arbitrary result based on the relative ordering of id(float) and
id(Decimal). See also issue #8188, which adds Decimal-to-Fraction
comparisons.
- Added a subtract() method to collections.Counter().
- Issue #8233: When run as a script, py_compile.py optionally takes a single
argument `-` which tells it to read files to compile from stdin. Each line is
read on demand and the named file is compiled immediately. (Original patch by
Piotr Ożarowski).
- Backwards incompatible change: Unicode codepoints line tabulation (0x0B) and
form feed (0x0C) are now considered linebreaks, as specified in Unicode
Standard Annex #14. See issue #7643. http://www.unicode.org/reports/tr14/
- Comparisons using one of <, <=, >, >= between a complex instance and a
Fractions instance now raise TypeError instead of returning True/False. This
makes Fraction <=> complex comparisons consistent with int <=> complex, float
<=> complex, and complex <=> complex comparisons.
- Issue #8139: ossaudiodev didn't initialize its types properly, therefore some
methods (such as oss_mixer_device.fileno()) were not available. Initial patch
by Bertrand Janin.
- Issue #8205: Remove the "Modules" directory from sys.path when Python is
running from the build directory (POSIX only).
- Issue #7512: shutil.copystat() could raise an OSError when the filesystem
didn't support chflags() (for example ZFS under FreeBSD). The error is now
silenced.
- Issue #7860: platform.uname now reports the correct 'machine' type when Python
is running in WOW64 mode on 64 bit Windows.
- Issue #3890, #8222: Fix recv() and recv_into() on non-blocking SSL sockets.
Also, enable the SSL_MODE_AUTO_RETRY flag on SSL sockets, so that blocking
reads and writes are always retried by OpenSSL itself.
- Issue #4282: Fix the main function of the profile module for a non-ASCII
script, open the file in binary mode and not in text mode with the default
(utf8) encoding.
- Issue #8179: Fix macpath.realpath() on a non-existing path.
- Issue #8024: Update the Unicode database to 5.2.
- Issue #8168: py_compile now handles files with utf-8 BOMS.
- ``tokenize.detect_encoding`` now returns ``'utf-8-sig'`` when a UTF-8 BOM is
detected.
- Issue #6716/2: Backslash-replace error output in compilall.
- Issue #4961: Inconsistent/wrong result of askyesno function in tkMessageBox
with Tcl/Tk-8.5.
- Issue #8140: extend compileall to compile single files. Add -i option.
- Issue #7356: ctypes.util: Make parsing of ldconfig output independent of the
locale.
- The internals of the subprocess module on POSIX systems have been replaced by
an extension module (_posixsubprocess) so that the fork()+exec() can be done
safely without the possibility of deadlock in multithreaded applications.
- subprocess.Popen now has restore_signals and start_new_session features. The
default of restore_signals=True is a new behavior compared to earlier Python
versions. This means that signals such as SIGPIPE are not ignored by default
in subprocesses launched by Python (Issue #1652).
- Issue #6472: The xml.etree package is updated to ElementTree 1.3. The
cElementTree module is updated too.
- Issue #7774: Set sys.executable to an empty string if argv[0] has been set to
an non existent program name and Python is unable to retrieve the real program
name.
- Issue #7880: Fix sysconfig when the python executable is a symbolic link.
- Issue #6509: fix re.sub to work properly when the pattern, the string, and the
replacement were all bytes. Patch by Antoine Pitrou.
- The sqlite3 module was updated to pysqlite 2.6.0. This fixes several obscure
bugs and allows loading SQLite extensions from shared libraries.
- Issue #1054943: Fix ``unicodedata.normalize('NFC', text)`` for the Public
Review Issue #29 (http://unicode.org/review/pr-29.html).
- Issue #7494: fix a crash in _lsprof (cProfile) after clearing the profiler,
reset also the pointer to the current pointer context.
- Issue #7232: Add support for the context manager protocol to the TarFile
class.
- Issue #7250: Fix info leak of os.environ across multi-run uses of
wsgiref.handlers.CGIHandler.
- Issue #1729305: Fix doctest to handle encode error with "backslashreplace".
- Issue #691291: codecs.open() should not convert end of lines on reading and
writing.
- Issue #7869: logging: improved diagnostic for format-time errors.
- Issue #7868: logging: added loggerClass attribute to Manager.
- logging: Implemented PEP 391.
- Issue #1537721: Add a writeheader() method to csv.DictWriter.
- Issue #7959: ctypes callback functions are now registered correctly with the
cycle garbage collector.
- Issue #5801: removed spurious empty lines in wsgiref.
- Issue #6666: fix bug in trace.py that applied the list of directories to be
ignored only to the first file. Noted by Bogdan Opanchuk.
- Issue #7597: curses.use_env() can now be called before initscr(). Noted by
Kan-Ru Chen.
- Issue #7310: fix the __repr__ of os.environ to show the environment variables.
- Issue #7970: email.Generator.flatten now correctly flattens message/rfc822
messages parsed by email.Parser.HeaderParser.
- Issue #7361: Importlib was not properly checking the number of bytes in
bytecode file when it was less then 8 bytes.
- Issue #7633: In the decimal module, Context class methods (with the exception
of canonical and is_canonical) now accept instances of int and long wherever a
Decimal instance is accepted, and implicitly convert that argument to Decimal.
Previously only some arguments were converted.
- Issue #7835: shelve should no longer produce mysterious warnings during
interpreter shutdown.
- Issue #2746: Don't escape ampersands and angle brackets ("&", "<", ">") in XML
processing instructions and comments. These raw characters are allowed by the
XML specification, and are necessary when outputting e.g. PHP code in a
processing instruction. Patch by Neil Muller.
- Issue #6233: ElementTree failed converting unicode characters to XML entities
when they could't be represented in the requested output encoding. Patch by
Jerry Chen.
- Issue #6003: add an argument to ``zipfile.Zipfile.writestr`` to specify the
compression type.
- Issue #4772: Raise a ValueError when an unknown Bluetooth protocol is
specified, rather than fall through to AF_PACKET (in the `socket` module).
Also, raise ValueError rather than TypeError when an unknown TIPC address type
is specified. Patch by Brian Curtin.
- Issue #6939: Fix file I/O objects in the `io` module to keep the original file
position when calling `truncate()`. It would previously change the file
position to the given argument, which goes against the tradition of
ftruncate() and other truncation APIs. Patch by Pascal Chambon.
- Issue #7610: Reworked implementation of the internal
:class:`zipfile.ZipExtFile` class used to represent files stored inside an
archive. The new implementation is significantly faster and can be wrapped in
a :class:`io.BufferedReader` object for more speedups. It also solves an
issue where interleaved calls to `read()` and `readline()` give wrong results.
Patch by Nir Aides.
- Issue #6963: Added "maxtasksperchild" argument to multiprocessing.Pool,
allowing for a maximum number of tasks within the pool to be completed by the
worker before that worker is terminated, and a new one created to replace it.
- Issue #7792: Registering non-classes to ABCs raised an obscure error.
- Issue #7785: Don't accept bytes in FileIO.write().
- Removed the functions 'verify' and 'vereq' from Lib/test/support.py.
- Issue #7773: Fix an UnboundLocalError in platform.linux_distribution() when
the release file is empty.
- Issue #7561: Fix crashes when using bytearray objects with the posix
module.
- Issue #1670765: Prevent email.generator.Generator from re-wrapping headers in
multipart/signed MIME parts, which fixes one of the sources of invalid
modifications to such parts by Generator.
- Issue #7703: Add support for the new buffer API to `binascii.a2bhqx`. Patch
by Florent Xicluna, along with some additional tests.
- Issue #7701: Fix crash in binascii.b2a_uu() in debug mode when given a 1-byte
argument. Patch by Victor Stinner.
- Issue #3299: Fix possible crash in the _sre module when given bad argument
values in debug mode. Patch by Victor Stinner.
- Issue #2846: Add support for gzip.GzipFile reading zero-padded files. Patch
by Brian Curtin.
- Issue #7681: Use floor division in appropiate places in the wave module.
- Issue #5372: Drop the reuse of .o files in Distutils' ccompiler (since
Extension extra options may change the output without changing the .c
file). Initial patch by Collin Winter.
- Issue #7617: Make sure distutils.unixccompiler.UnixCCompiler recognizes gcc
when it has a fully qualified configuration prefix. Initial patch by Arfrever.
- Issue #7105: Make WeakKeyDictionary and WeakValueDictionary robust against the
destruction of weakref'ed objects while iterating.
- Issue #7455: Fix possible crash in cPickle on invalid input. Patch by Victor
Stinner.
- Issue #1628205: Socket file objects returned by socket.socket.makefile() now
properly handles EINTR within the read, readline, write & flush methods. The
socket.sendall() method now properly handles interrupted system calls.
- Issue #7471: Improve the performance of GzipFile's buffering mechanism, and
make it implement the `io.BufferedIOBase` ABC to allow for further speedups by
wrapping it in an `io.BufferedReader`. Patch by Nir Aides.
- Issue #3972: http.client.HTTPConnection now accepts an optional source_address
parameter to allow specifying where your connections come from.
- socket.create_connection now accepts an optional source_address parameter.
- Issue #5511: now zipfile.ZipFile can be used as a context manager. Initial
patch by Brian Curtin.
- Issue #7556: Make sure Distutils' msvc9compile reads and writes the MSVC XML
Manifest file in text mode so string patterns can be used in regular
expressions.
- Issue #7552: Removed line feed in the base64 Authorization header in the
Distutils upload command to avoid an error when PyPI reads it. This occurs on
long passwords. Initial patch by JP St. Pierre.
- Issue #7231: urllib2 cannot handle https with proxy requiring auth. Patch by
Tatsuhiro Tsujikawa.
- Issue #4757: `zlib.compress` and other methods in the zlib module now raise a
TypeError when given an `str` object (rather than a `bytes`-like object).
Patch by Victor Stinner and Florent Xicluna.
- Issue #7349: Make methods of file objects in the io module accept None as an
argument where file-like objects (ie StringIO and BytesIO) accept them to mean
the same as passing no argument.
- Issue #7357: tarfile no longer suppresses fatal extraction errors by default.
- Issue #5949: added check for correct lineends in input from IMAP server in
imaplib.
- Add count() and reverse() methods to collections.deque().
- Fix variations of extending deques: d.extend(d) d.extendleft(d) d+=d
- Issue #6986: Fix crash in the JSON C accelerator when called with the wrong
parameter types. Patch by Victor Stinner.
- Issue #7457: added a read_pkg_file method to
distutils.dist.DistributionMetadata.
- logging: Added optional `secure` parameter to SMTPHandler, to enable use of
TLS with authentication credentials.
- Issue #1923: Fixed the removal of meaningful spaces when PKG-INFO is generated
in Distutils. Patch by Stephen Emslie.
- Issue #4120: Drop reference to CRT from manifest when building extensions with
msvc9compiler.
- Issue #7333: The `posix` module gains an `initgroups()` function providing
access to the initgroups(3) C library call on Unix systems which implement it.
Patch by Jean-Paul Calderone.
- Issue #7408: Fixed distutils.tests.sdist so it doesn't check for group
ownership when the group is not forced, because the group may be different
from the user's group and inherit from its container when the test is run.
- Issue #4486: When an exception has an explicit cause, do not print its
implicit context too. This affects the `traceback` module as well as built-in
exception printing.
- Issue #1515: Enable use of deepcopy() with instance methods. Patch by Robert
Collins.
- Issue #7403: logging: Fixed possible race condition in lock creation.
- Issue #6845: Add restart support for binary upload in ftplib. The
`storbinary()` method of FTP and FTP_TLS objects gains an optional `rest`
argument. Patch by Pablo Mouzo.
- Issue #5788: `datetime.timedelta` objects get a new `total_seconds()` method
returning the total number of seconds in the duration. Patch by Brian
Quinlan.
- Issue #7133: SSL objects now support the new buffer API.
- Issue #1488943: difflib.Differ() doesn't always add hints for tab characters.
- Issue #6123: tarfile now opens empty archives correctly and consistently
raises ReadError on empty files.
- Issue #7354: distutils.tests.test_msvc9compiler - dragfullwindows can be 2.
- Issue #5037: Proxy the __bytes__ special method instead to __bytes__ instead
of __str__.
- Issue #7341: Close the internal file object in the TarFile constructor in case
of an error.
- Issue #7293: distutils.test_msvc9compiler is fixed to work on any fresh
Windows box. Help provided by David Bolen.
- Issue #2054: ftplib now provides an FTP_TLS class to do secure FTP using TLS
or SSL. Patch by Giampaolo Rodola'.
- Issue #7328: pydoc no longer corrupts sys.path when run with the '-m' switch.
- Issue #4969: The mimetypes module now reads the MIME database from the
registry under Windows. Patch by Gabriel Genellina.
- Issue #6816: runpy now provides a run_path function that allows Python code to
execute file paths that refer to source or compiled Python files as well as
zipfiles, directories and other valid sys.path entries that contain a
__main__.py file. This allows applications that run other Python scripts to
support the same flexibility as the CPython command line itself.
- Issue #7318: multiprocessing now uses a timeout when it fails to establish a
connection with another process, rather than looping endlessly. The default
timeout is 20 seconds, which should be amply sufficient for local connections.
- Issue #7197: Allow unittest.TextTestRunner objects to be pickled and
unpickled. This fixes crashes under Windows when trying to run
test_multiprocessing in verbose mode.
- Issue #7893: ``unittest.TextTestResult`` is made public and a ``resultclass``
argument added to the TextTestRunner constructor allowing a different result
class to be used without having to subclass.
- Issue #7588: ``unittest.TextTestResult.getDescription`` now includes the test
name in failure reports even if the test has a docstring.
- Issue #3001: Add a C implementation of recursive locks which is used by
default when instantiating a `threading.RLock` object. This makes recursive
locks as fast as regular non-recursive locks (previously, they were slower by
10x to 15x).
- Issue #7282: Fix a memory leak when an RLock was used in a thread other than
those started through `threading.Thread` (for example, using
`_thread.start_new_thread()`).
- Issue #7187: Importlib would not silence the IOError raised when trying to
write new bytecode when it was made read-only.
- Issue #7264: Fix a possible deadlock when deallocating thread-local objects
which are part of a reference cycle.
- Issue #7211: Allow 64-bit values for the `ident` and `data` fields of kevent
objects on 64-bit systems. Patch by Michael Broghton.
- Issue #6896: mailbox.Maildir now invalidates its internal cache each time a
modification is done through it. This fixes inconsistencies and test failures
on systems with slightly bogus mtime behaviour.
- Issue #7246 & Issue #7208: getpass now properly flushes input before reading
from stdin so that existing input does not confuse it and lead to incorrect
entry or an IOError. It also properly flushes it afterwards to avoid the
terminal echoing the input afterwards on OSes such as Solaris.
- Issue #7233: Fix a number of two-argument Decimal methods to make sure that
they accept an int or long as the second argument. Also fix buggy handling of
large arguments (those with coefficient longer than the current precision) in
shift and rotate.
- Issue #4750: Store the basename of the original filename in the gzip FNAME
header as required by RFC 1952.
- Issue #1180: Added a new global option to ignore ~/.pydistutils.cfg in
Distutils.
- Issue #7218: Fix test_site for win32, the directory comparison was done with
an uppercase.
- Issue #7205: Fix a possible deadlock when using a BZ2File object from
several threads at once.
- Issue #7077: logging: SysLogHandler now treats Unicode as per RFC 5424.
- Issue #7099: Decimal.is_normal now returns True for numbers with exponent
larger than emax.
- Issue #7080: locale.strxfrm() raises a MemoryError on 64-bit non-Windows
platforms, and assorted locale fixes by Derk Drukker.
- Issue #5833: Fix extra space character in readline completion with the GNU
readline library version 6.0.
- Issue #6894: Fixed the issue urllib2 doesn't respect "no_proxy" environment.
- Issue #7086: Added TCP support to SysLogHandler, and tidied up some
anachronisms in the code which were a relic of 1.5.2 compatibility.
- Issue #7082: When falling back to the MIME 'name' parameter, the correct place
to look for it is the Content-Type header.
- Make tokenize.detect_coding() normalize utf-8 and iso-8859-1 variants like the
builtin tokenizer.
- Issue #7048: Force Decimal.logb to round its result when that result is too
large to fit in the current precision.
- Issue #6236, #6348: Fix various failures in the I/O library under AIX and
other platforms, when using a non-gcc compiler. Patch by Derk Drukker.
- Issue #4606: Passing 'None' if ctypes argtype is set to POINTER(...) does now
always result in NULL.
- Issue #5042: Structure sub-subclass does now initialize correctly with base
class positional arguments.
- Issue #6882: Import uuid creates zombies processes.
- Issue #6635: Fix profiler printing usage message.
- Issue #6856: Add a filter keyword argument to TarFile.add().
- Issue #6888: pdb's alias command was broken when no arguments were given.
- Issue #6857: Default format() alignment should be '>' for Decimal instances.
- Issue #6795: int(Decimal('nan')) now raises ValueError instead of returning
NaN or raising InvalidContext. Also, fix infinite recursion in
long(Decimal('nan')).
- Issue #6850: Fix bug in Decimal._parse_format_specifier for formats with no
type specifier.
- Issue #6239: ctypes.c_char_p return value must return bytes.
- Issue #6838: Use a list to accumulate the value instead of repeatedly
concatenating strings in http.client's HTTPResponse._read_chunked providing a
significant speed increase when downloading large files servend with a
Transfer-Encoding of 'chunked'.
- Trying to import a submodule from a module that is not a package, ImportError
should be raised, not AttributeError.
- When the globals past to importlib.__import__() has __package__ set to None,
fall back to computing what __package__ should be instead of giving up.
- Raise a TypeError when the name of a module to be imported for
importlib.__import__ is not a string (was raising an AttributeError before).
- Allow the fromlist passed into importlib.__import__ to be any iterable.
- Have importlib raise ImportError if None is found in sys.modules.
- Issue #6054: Do not normalize stored pathnames in tarfile.
- Issue #6794: Fix Decimal.compare_total and Decimal.compare_total_mag: NaN
payloads are now ordered by integer value rather than lexicographically.
- Issue #1356969: Add missing info methods in tix.HList.
- Issue #1522587: New constants and methods for the tix.Grid widget.
- Issue #1250469: Fix the return value of tix.PanedWindow.panes.
- Issue #1119673: Do not override tkinter.Text methods when creating a
ScrolledText.
- Issue #6665: Fix fnmatch to properly match filenames with newlines in them.
- Issue #1135: Add the XView and YView mix-ins to avoid duplicating the xview*
and yview* methods.
- Issue #6629: Fix a data corruption issue in the new I/O library, which could
occur when writing to a BufferedRandom object (e.g. a file opened in "rb+" or
"wb+" mode) after having buffered a certain amount of data for reading. This
bug was not present in the pure Python implementation.
- Issue #6622: Fix "local variable 'secret' referenced before assignment" bug in
POP3.apop.
- Issue #2715: Remove remnants of Carbon.File from binhex module.
- Issue #6595: The Decimal constructor now allows arbitrary Unicode decimal
digits in input, as recommended by the standard. Previously it was restricted
to accepting [0-9].
- Issue #6106: telnetlib.Telnet.process_rawq doesn't handle default WILL/WONT
DO/DONT correctly.
- Issue #1424152: Fix for http.client, urllib.request to support SSL while
working through proxy. Original patch by Christopher Li, changes made by
Senthil Kumaran.
- Add importlib.abc.ExecutionLoader to represent the PEP 302 protocol for
loaders that allow for modules to be executed. Both importlib.abc.PyLoader and
PyPycLoader inherit from this class and provide implementations in relation to
other methods required by the ABCs.
- importlib.abc.PyLoader did not inherit from importlib.abc.ResourceLoader like
the documentation said it did even though the code in PyLoader relied on the
abstract method required by ResourceLoader.
- Issue #6431: Make Fraction type return NotImplemented when it doesn't know how
to handle a comparison without loss of precision. Also add correct handling
of infinities and nans for comparisons with float.
- Issue #6415: Fixed warnings.warn segfault on bad formatted string.
- Issue #6358: The exit status of a command started with os.popen() was reported
differently than it did with python 2.x.
- Issue #6323: The pdb debugger did not exit when running a script with a syntax
error.
- Issue #3392: The subprocess communicate() method no longer fails in select()
when file descriptors are large; communicate() now uses poll() when possible.
- Issue #6369: Fix an RLE decompression bug in the binhex module.
- Issue #6344: Fixed a crash of mmap.read() when passed a negative argument.
- The deprecated function string.maketrans has been removed.
- Issue #4005: Fixed a crash of pydoc when there was a zip file present in
sys.path.
- Issue #6218: io.StringIO and io.BytesIO instances are now picklable.
- The os.get_exec_path() function to return the list of directories that will be
searched for an executable when launching a subprocess was added.
- Issue #7481: When a threading.Thread failed to start it would leave the
instance stuck in initial state and present in threading.enumerate().
- Issue #1068268: The subprocess module now handles EINTR in internal os.waitpid
and os.read system calls where appropriate.
- Issue #6729: Added ctypes.c_ssize_t to represent ssize_t.
- Issue #6247: The argparse module has been added to the standard library.
- Issue #8235: _socket: Add the constant ``SO_SETFIB``. SO_SETFIB is a socket
option available on FreeBSD 7.1 and newer.
- Issue #9315: Fix for the trace module to record correct class name
for tracing methods.
Extension Modules
-----------------
- Issue #9959: Tweak formula used for computing math.log of an integer,
making it marginally more accurate for exact powers of 2.
- Issue #9422: Fix memory leak when re-initializing a struct.Struct object.
- Issue #7900: The getgroups(2) system call on MacOSX behaves rather oddly
compared to other unix systems. In particular, os.getgroups() does not reflect
any changes made using os.setgroups() but basicly always returns the same
information as the id command. os.getgroups() can now return more than 16
groups on MacOSX.
- Issue #6095: Make directory argument to os.listdir optional.
- Issue #9277: Fix bug in struct.pack for bools in standard mode (e.g.,
struct.pack('>?')): if conversion to bool raised an exception then that
exception wasn't properly propagated on machines where char is unsigned.
- Issue #5180: Fixed a bug that prevented loading 2.x pickles in 3.x python when
they contain instances of old-style classes.
- Issue #9165: Add new functions math.isfinite and cmath.isfinite, to accompany
existing isinf and isnan functions.
- Issue #1578269: Implement os.symlink for Windows 6.0+. Patch by Jason
R. Coombs.
- In struct.pack, correctly propogate exceptions from computing the truth of an
object in the '?' format.
- Issue #9000: datetime.timezone objects now have eval-friendly repr.
- In the math module, correctly lookup __trunc__, __ceil__, and __floor__ as
special methods.
- Issue #9005: Prevent utctimetuple() from producing year 0 or year 10,000.
Prior to this change, timezone adjustment in utctimetuple() could produce
tm_year value of 0 or 10,000. Now an OverflowError is raised in these edge
cases.
- Issue #6641: The ``datetime.strptime`` method now supports the ``%z``
directive. When the ``%z`` directive is present in the format string, an
aware ``datetime`` object is returned with ``tzinfo`` bound to a
``datetime.timezone`` instance constructed from the parsed offset. If both
``%z`` and ``%Z`` are present, the data in ``%Z`` field is used for timezone
name, but ``%Z`` data without ``%z`` is discarded.
- Issue #5094: The ``datetime`` module now has a simple concrete class
implementing ``datetime.tzinfo`` interface. Instances of the new class,
``datetime.timezone``, return fixed name and UTC offset from their
``tzname(dt)`` and ``utcoffset(dt)`` methods. The ``dst(dt)`` method always
returns ``None``. A class attribute, ``utc`` contains an instance
representing the UTC timezone. Original patch by Rafe Kaplan.
- Issue #8973: Add __all__ to struct module; this ensures that help(struct)
includes documentation for the struct.Struct class.
- Issue #3129: Trailing digits in struct format string are no longer ignored.
For example, "1" or "ilib123" are now invalid formats and cause
``struct.error`` to be raised. Patch by Caleb Deveraux.
- Issue #7384: If the system readline library is linked against ncurses, the
curses module must be linked against ncurses as well. Otherwise it is not safe
to load both the readline and curses modules in an application.
- Issue #2810: Fix cases where the Windows registry API returns ERROR_MORE_DATA,
requiring a re-try in order to get the complete result.
- Issue #8692: Optimize math.factorial: replace the previous naive algorithm
with an improved 'binary-split' algorithm that uses fewer multiplications and
allows many of the multiplications to be performed using plain C integer
arithmetic instead of PyLong arithmetic. Also uses a lookup table for small
arguments.
- Issue #8674: Fixed a number of incorrect or undefined-behaviour-inducing
overflow checks in the audioop module.
- Issue #8644: The accuracy of td.total_seconds() has been improved (by
calculating with integer arithmetic instead of float arithmetic internally):
the result is now always correctly rounded, and is equivalent to ``td /
timedelta(seconds=1)``.
- Issue #2706: Allow division of a timedelta by another timedelta: timedelta /
timedelta, timedelta % timedelta, timedelta // timedelta and divmod(timedelta,
timedelta) are all supported.
- Issue #8314: Fix unsigned long long bug in libffi on Sparc v8.
- Issue #8300: When passing a non-integer argument to struct.pack with any
integer format code, struct.pack first attempts to convert the non-integer
using its __index__ method. If that method is non-existent or raises
TypeError it goes on to try the __int__ method, as described below.
- Issue #8142: Update libffi to the 3.0.9 release.
- Issue #6949: Allow the _dbm extension to be built with db 4.8.x.
- Issue #6544: Fix a reference leak in the kqueue implementation's error
handling.
- Stop providing crtassem.h symbols when compiling with Visual Studio 2010, as
msvcr100.dll is not a platform assembly anymore.
- Issue #6508: Add posix.{getresuid,getresgid,setresuid,setresgid}.
- Issue #7078: Set struct.__doc__ from _struct.__doc__.
- Issue #3366: Add erf, erfc, expm1, gamma, lgamma functions to math module.
- Issue #6877: It is now possible to link the readline extension to the libedit
readline emulation on OSX 10.5 or later.
- Issue #6848: Fix curses module build failure on OS X 10.6.
- Fix a segfault that could be triggered by expat with specially formed input.
- Issue #6561: '\d' in a regex now matches only characters with Unicode category
'Nd' (Number, Decimal Digit). Previously it also matched characters with
category 'No'.
- Issue #4509: Array objects are no longer modified after an operation failing
due to the resize restriction in-place when the object has exported buffers.
- Issue #2389: Array objects are now pickled in a portable manner.
- Expat: Fix DoS via XML document with malformed UTF-8 sequences
(CVE_2009_3560).
- Issue #7242: On Solaris 9 and earlier calling os.fork() from within a thread
could raise an incorrect RuntimeError about not holding the import lock. The
import lock is now reinitialized after fork.
- Issue #7999: os.setreuid() and os.setregid() would refuse to accept a -1
parameter on some platforms such as OS X.
- Build the ossaudio extension on GNU/kFreeBSD.
- Issue #7347: winreg: Add CreateKeyEx and DeleteKeyEx, as well as fix a bug in
the return value of QueryReflectionKey.
- Issue #7567: PyCurses_setupterm: Don't call ``setupterm`` twice.
Build
-----
- Use OpenSSL 1.0.0a on Windows.
- Issue #9280: Make sharedinstall depend on sharedmods.
- Issue #9189: Make a user-specified CFLAGS, CPPFLAGS, or LDFLAGS setting
override the configure and makefile defaults, without deleting options the
user didn't intend to override. Developers should no longer need to specify
OPT or EXTRA_CFLAGS, although those variables are still present for
backward-compatibility.
- Issue #8854: Fix finding Visual Studio 2008 on Windows x64.
- Issue #1759169, #8864: Drop _XOPEN_SOURCE on Solaris, define it for
multiprocessing only.
- Issue #8625: Turn off optimization in --with-pydebug builds with gcc.
(Optimization was unintentionally turned on in gcc --with-pydebug builds as a
result of the issue #1628484 fix, combined with autoconf's strange choice of
default CFLAGS produced by AC_PROG_CC for gcc.)
- Issue #3646: It is now easily possible to install a Python framework into your
home directory on MacOSX, see Mac/README for more information.
- Issue #3928: os.mknod() now available in Solaris, also.
- Issue #3326: Build Python without -fno-strict-aliasing when the gcc does not
give false warnings.
- Issue #1628484: The Makefile doesn't ignore the CFLAGS environment variable
anymore. It also forwards the LDFLAGS settings to the linker when building a
shared library.
- Issue #6716: Quote -x arguments of compileall in MSI installer. Exclude 2to3
tests from compileall.
- Issue #3920, #7903: Define _BSD_SOURCE on OpenBSD 4.4 through 4.9.
- Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the private
memory allocation scheme in dtoa.c and use PyMem_Malloc and PyMem_Free
instead. Also disable caching of powers of 5.
- Issue #6491: Allow --with-dbmliborder to specify that no dbms will be built.
- Issue #6943: Use pkg-config to find the libffi headers when the
--with-system-ffi flag is used.
- Issue #7609: Add a --with-system-expat option that causes the system's expat
library to be used for the pyexpat module instead of the one included with
Python.
- Issue #7589: Only build the nis module when the correct header files are
found.
- Switch to OpenSSL 0.9.8l and sqlite 3.6.21 on Windows.
- Issue #5792: Extend the short float repr support to x86 systems using
icc or suncc.
- Issue #6603: Change READ_TIMESTAMP macro in ceval.c so that it compiles
correctly under gcc on x86-64. This fixes a reported problem with the
--with-tsc build on x86-64.
- Issue #6802: Fix build issues on MacOSX 10.6.
- Issue #6244: Allow detect_tkinter to look for Tcl/Tk 8.6.
- Issue #4601: 'make install' did not set the appropriate permissions on
directories.
- Issue #5390: Add uninstall icon independent of whether file extensions are
installed.
- Issue #7541: When using ``python-config`` with a framework install the
compiler might use the wrong library.
- python-config now supports multiple options on the same command line.
- Issue #8509: Fix quoting in help strings and code snippets in configure.in.
- Issue #8510: Update to autoconf2.65.
Documentation
-------------
- Issue #9817: Add expat COPYING file; add expat, libffi and expat licenses
to Doc/license.rst.
- Issue #9524: Document that two CTRL* signals are meant for use only
with os.kill.
- Issue #9255: Document that the 'test' package is meant for internal Python use
only.
- A small WSGI server was added as Tools/scripts/serve.py, and is used to
implement a local documentation server via 'make serve' in the doc directory.
- Updating `Using Python` documentation to include description of CPython's -J
and -X options.
- Document that importing a module that has None in sys.modules triggers an
ImportError.
- Issue #6556: Fixed the Distutils configuration files location explanation for
Windows.
- Update python manual page (options -B, -O0, -s, environment variables
PYTHONDONTWRITEBYTECODE, PYTHONNOUSERSITE).
- Issue #8909: Added the size of the bitmap used in the installer created by
distutils' bdist_wininst. Patch by Anatoly Techtonik.
Tests
-----
- Issue #9251: test_threaded_import didn't fail when run through regrtest if the
import lock was disabled.
- Issue #8605: Skip test_gdb if Python is compiled with optimizations.
- Issue #7449: Skip test_socketserver if threading support is disabled.
- Issue #8672: Add a zlib test ensuring that an incomplete stream can be handled
by a decompressor object without errors (it returns incomplete uncompressed
data).
- Issue #8533: regrtest uses backslashreplace error handler for stdout to avoid
UnicodeEncodeError (write non-ASCII character to stdout using ASCII encoding).
- Issue #8576: Remove use of find_unused_port() in test_smtplib and
test_multiprocessing. Patch by Paul Moore.
- Issue #7449: Fix many tests to support Python compiled without thread
support. Patches written by Jerry Seutter.
- Issue #8108: test_ftplib's non-blocking SSL server now has proper handling of
SSL shutdowns.
- Issues #8279, #8330, #8437, #8480, #8495: Fix test_gdb failures, patch written
by Dave Malcolm.
- Issue #3864: Skip three test_signal tests on freebsd6 because they fail if any
thread was previously started, most likely due to a platform bug.
- Issue #8193: Fix test_zlib failure with zlib 1.2.4.
- Issue #8248: Add some tests for the bool type. Patch by Gregory Nofi.
- Issue #8263: Now regrtest.py will report a failure if it receives a
KeyboardInterrupt (SIGINT).
- Issue #8180 and #8207: Fix test_pep277 on OS X and add more tests for special
Unicode normalization cases.
- Issue #7783: test.support.open_urlresource invalidates the outdated files from
the local cache.
- Issue #7849: Now the utility ``check_warnings`` verifies if the warnings are
effectively raised.
- The four path modules (genericpath, macpath, ntpath, posixpath) share a common
TestCase for some tests: test_genericpath.CommonTest.
- Print platform information when running the whole test suite, or using the
--verbose flag.
- Issue #767675: enable test_pep277 on POSIX platforms with Unicode-friendly
filesystem encoding.
- Issue #6292: for the moment at least, the test suite runs cleanly if python is
run with the -OO flag. Tests requiring docstrings are skipped.
- Issue #7712: test.support gained a new `temp_cwd` context manager which is now
also used by regrtest to run all the tests in a temporary directory. The
original CWD is saved in `support.SAVEDCWD`. Thanks to Florent Xicluna who
helped with the patch.
- Issue #7924: Fix an intermittent 'XXX undetected error' failure in test_capi
(only seen so far on platforms where the curses module wasn't built), due to
an uncleared exception.
- Issue #7728: test_timeout was changed to use support.bind_port instead of a
hard coded port.
- Issue #7376: Instead of running a self-test (which was failing) when called
with no arguments, doctest.py now gives a usage message.
- Issue #7396: fix regrtest -s, which was broken by the -j enhancement.
- Issue #7498: test_multiprocessing now uses test.support.find_unused_port
instead of a hardcoded port number in test_rapid_restart.
- Issue #7431: Use TESTFN in test_linecache instead of trying to create a file
in the Lib/test directory, which might be read-only for the user running the
tests.
- Issue #7324: Add a sanity check to regrtest argument parsing to catch the case
of an option with no handler.
- Issue #7312: Add a -F flag to run the selected tests in a loop until a test
fails. Can be combined with -j.
- Issue #6551: test_zipimport could import and then destroy some modules of the
encodings package, which would make other tests fail further down the road
because the internally cached encoders and decoders would point to empty
global variables.
- Issue #7295: Do not use a hardcoded file name in test_tarfile.
- Issue #7270: Add some dedicated unit tests for multi-thread synchronization
primitives such as Lock, RLock, Condition, Event and Semaphore.
- Issue #7248 (part 2): Use a unique temporary directory for importlib source
tests instead of tempfile.tempdir. This prevents the tests from sharing state
between concurrent executions on the same system.
- Issue #7248: In importlib.test.source.util a try/finally block did not make
sure that some referenced objects actually were created in the block before
calling methods on the object.
- Issue #7222: Make thread "reaping" more reliable so that reference
leak-chasing test runs give sensible results. The previous method of reaping
threads could return successfully while some Thread objects were still
referenced. This also introduces a new private function:
:func:`_thread._count()`.
- Issue #7151: Fixed regrtest -j so that output to stderr from a test no longer
runs the risk of causing the worker thread to fail.
- Issue #7055: test___all__ now greedily detects all modules which have an
__all__ attribute, rather than using a hardcoded and incomplete list.
- Issue #7058: Added save/restore for things like sys.argv and cwd to
runtest_inner in regrtest, with warnings if the called test modifies them, and
a new section in the summary report at the end.
- Issue #7042: Fix test_signal (test_itimer_virtual) failure on OS X 10.6.
- Fixed tests in importlib.test.source.test_abc_loader that were masking the
proper exceptions that should be raised for missing or improper code object
bytecode.
- Removed importlib's custom test discovery code and switched to
unittest.TestLoader.discover().
Tools/Demos
-----------
- Issue #5464, #8974: Implement plural forms in msgfmt.py.
- iobench (a file I/O benchmark) and ccbench (a concurrency benchmark) were
added to the `Tools/` directory. They were previously living in the sandbox.
What's New in Python 3.1?
=========================
*Release date: 27-June-2009*
Core and Builtins
-----------------
- Issue #6334: Fix bug in range length calculation for ranges with
large arguments.
- Issue #6329: Fixed iteration for memoryview objects (it was being blocked
because it wasn't recognized as a sequence).
Library
-------
- Issue #6126: Fixed pdb command-line usage.
- Issue #6314: logging: performs extra checks on the "level" argument.
- Issue #6274: Fixed possible file descriptors leak in subprocess.py
- Accessing io.StringIO.buffer now raises an AttributeError instead of
io.UnsupportedOperation.
- Issue #6271: mmap tried to close invalid file handle (-1) when anonymous.
(On Unix)
- Issue #1202: zipfile module would cause a struct.error when attempting to
store files with a CRC32 > 2**31-1.
Extension Modules
-----------------
- Issue #5590: Remove unused global variable in pyexpat extension.
What's New in Python 3.1 Release Candidate 2?
=============================================
*Release date: 13-June-2009*
Core and Builtins
-----------------
- Fixed SystemError triggered by "range([], 1, -1)".
- Issue #5924: On Windows, a large PYTHONPATH environment variable
(more than 255 characters) would be completely ignored.
- Issue #4547: When debugging a very large function, it was not always
possible to update the lineno attribute of the current frame.
- Issue #5330: C functions called with keyword arguments were not reported by
the various profiling modules (profile, cProfile). Patch by Hagen Fürstenau.
Library
-------
- Issue #6438: Fixed distutils.cygwinccompiler.get_versions : the regular
expression string pattern was trying to match against a bytes returned by
Popen. Tested under win32 to build the py-postgresql project.
- Issue #6258: Support AMD64 in bdist_msi.
- Issue #6195: fixed doctest to no longer try to read 'source' data from
binary files.
- Issue #5262: Fixed bug in next rollover time computation in
TimedRotatingFileHandler.
- Issue #6217: The C implementation of io.TextIOWrapper didn't include the
errors property. Additionally, the errors and encoding properties of StringIO
are always None now.
- Issue #6137: The pickle module now translates module names when loading
or dumping pickles with a 2.x-compatible protocol, in order to make data
sharing and migration easier. This behaviour can be disabled using the
new `fix_imports` optional argument.
- Removed the ipaddr module.
- Issue #3613: base64.{encode,decode}string are now called
base64.{encode,decode}bytes which reflects what type they accept and return.
The old names are still there as deprecated aliases.
- Issue #5767: Remove sgmlop support from xmlrpc.client.
- Issue #6150: Fix test_unicode on wide-unicode builds.
- Issue #6149: Fix initialization of WeakValueDictionary objects from non-empty
parameters.
Windows
-------
- Issue #6221: Delete test registry key before running the test.
- Issue #6158: Package Sine-1000Hz-300ms.aif in MSI file.
C-API
-----
- Issue #5735: Python compiled with --with-pydebug should throw an
ImportError when trying to import modules compiled without
--with-pydebug, and vice-versa.
Build
-----
- Issue #6154: Make sure the intl library is added to LIBS if needed. Also
added LIBS to OS X framework builds.
- Issue #5809: Specifying both --enable-framework and --enable-shared is
an error. Configure now explicity tells you about this.
What's New in Python 3.1 release candidate 1?
=============================================
*Release date: 2009-05-30*
Core and Builtins
-----------------
- Issue #6097: Escape UTF-8 surrogates resulting from mbstocs conversion
of the command line.
- Issue #6012: Add cleanup support to O& argument parsing.
- Issue #6089: Fixed str.format with certain invalid field specifiers
that would raise SystemError.
- Issue #5982: staticmethod and classmethod now expose the wrapped
function with __func__.
- Added support for multiple context managers in the same with-statement.
Deprecated contextlib.nested() which is no longer needed.
- Issue #5829: complex("1e500") no longer raises OverflowError. This
makes it consistent with float("1e500") and interpretation of real
and imaginary literals.
- Issue #3527: Removed Py_WIN_WIDE_FILENAMES which is not used any more.
- Issue #5994: the marshal module now has docstrings.
- Issue #5981: Fix three minor inf/nan issues in float.fromhex:
(1) inf and nan strings with trailing whitespace were incorrectly
rejected; (2) parsing of strings representing infinities and nans
was locale aware; and (3) the interpretation of fromhex('-nan')
didn't match that of float('-nan').
Library
-------
- Issue #4859: Implement PEP 383 for pwd, spwd, and grp.
- smtplib 'login' and 'cram-md5' login are also fixed (see Issue #5259).
- Issue #6121: pydoc now ignores leading and trailing spaces in the
argument to the 'help' function.
- Issue #6118: urllib.parse.quote_plus ignored the encoding and errors
arguments for strings with a space in them.
- collections.namedtuple() was not working with the following field
names: cls, self, tuple, itemgetter, and property.
- In unittest, using a skipping decorator on a class is now equivalent to
skipping every test on the class. The ClassTestSuite class has been removed.
- Issue #6050: Don't fail extracting a directory from a zipfile if
the directory already exists.
- Issue #1309352: fcntl now converts its third arguments to a C `long` rather
than an int, which makes some operations possible under 64-bit Linux (e.g.
DN_MULTISHOT with F_NOTIFY).
- Issue #5761: Add the name of the underlying file to the repr() of various
IO objects.
- Issue #5259: smtplib plain auth login no longer gives a traceback. Fix
by Musashi Tamura, tests by Marcin Bachry.
- Issue #1983: Fix functions taking or returning a process identifier to use
the dedicated C type ``pid_t`` instead of a C ``int``. Some platforms have
a process identifier type wider than the standard C integer type.
- Issue #4066: smtplib.SMTP_SSL._get_socket now correctly returns the socket.
Patch by Farhan Ahmad, test by Marcin Bachry.
- Issue #2116: Weak references and weak dictionaries now support copy()ing and
deepcopy()ing.
- Issue #1655: Make imaplib IPv6-capable. Patch by Derek Morr.
- Issue #5918: Fix a crash in the parser module.
- Issue #1664: Make nntplib IPv6-capable. Patch by Derek Morr.
- Issue #5006: Better handling of unicode byte-order marks (BOM) in the io
library. This means, for example, that opening an UTF-16 text file in
append mode doesn't add a BOM at the end of the file if the file isn't
empty.
- Issue #4050: inspect.findsource/getsource now raise an IOError if the 'source'
file is a binary. Patch by Brodie Rao, tests by Daniel Diniz. This fix
corrects a pydoc regression.
- Issue #5955: aifc's close method did not close the file it wrapped,
now it does. This also means getfp method now returns the real fp.
Installation
------------
- Issue #6047: fullinstall has been removed because Python 3's executable will
now be known as python3.
- Lib/smtpd.py is no longer installed as a script.
Extension Modules
-----------------
- Issue #3061: Use wcsftime for time.strftime where available.
- Issue #4873: Fix resource leaks in error cases of pwd and grp.
- Issue #6093: Fix off-by-one error in locale.strxfrm.
- The _functools and _locale modules are now built into the libpython shared
library instead of as extension modules.
Build
-----
- Issue #3585: Add pkg-config support. It creates a python-2.7.pc file
and a python3.pc symlink in the $(LIBDIR)/pkgconfig directory. Patch by
Clinton Roy.
Tests
-----
- Issue #5442: Tests for importlib were not properly skipping case-sensitivity
tests on darwin even when the OS was installed on a case-sensitive
filesystem. Also fixed tests that should not be run when
sys.dont_write_bytecode is true.
What's New in Python 3.1 beta 1?
================================
*Release date: 2009-05-06*
Core and Builtins
-----------------
- Issue #5914: Add new C API function PyOS_string_to_double, and
deprecate PyOS_ascii_strtod and PyOS_ascii_atof.
- Issue #3382: float.__format__, complex.__format__, and %-formatting
no longer map 'F' to 'f'. Because of issue #5859 (below), this only
affects nan -> NAN and inf -> INF.
- Issue #5799: ntpath (ie, os.path on Windows) fully supports UNC pathnames
in all operations, including splitdrive, split, etc. splitunc() now issues
a PendingDeprecation warning.
- Issue #5920: For float.__format__, change the behavior with the
empty presentation type (that is, not one of 'e', 'f', 'g', or 'n')
to be like 'g' but with at least one decimal point and with a
default precision of 12. Previously, the behavior the same but with
a default precision of 6. This more closely matches str(), and
reduces surprises when adding alignment flags to the empty
presentation type. This also affects the new complex.__format__ in
the same way.
- Implement PEP 383, Non-decodable Bytes in System Character Interfaces.
- Issue #5890: in subclasses of 'property' the __doc__ attribute was
shadowed by classtype's, even if it was None. property now
inserts the __doc__ into the subclass instance __dict__.
- Issue #4426: The UTF-7 decoder was too strict and didn't accept some legal
sequences. Patch by Nick Barnes and Victor Stinner.
- Issue #3672: Reject surrogates in utf-8 codec; add surrogatepass error handler.
- Issue #5883: In the io module, the BufferedIOBase and TextIOBase ABCs have
received a new method, detach(). detach() disconnects the underlying stream
from the buffer or text IO and returns it.
- Issue #5859: Remove switch from '%f' to '%g'-style formatting for
floats with absolute value over 1e50. Also remove length
restrictions for float formatting: '%.67f' % 12.34 and '%.120e' %
12.34 no longer raise an exception.
- Issue #1588: Add complex.__format__. For example,
format(complex(1, 2./3), '.5') now produces a sensible result.
- Issue #5864: Fix empty format code formatting for floats so that it
never gives more than the requested number of significant digits.
- Issue #5793: Rationalize isdigit / isalpha / tolower, etc. Includes
new Py_ISDIGIT / Py_ISALPHA / Py_TOLOWER, etc. in pctypes.h.
- Issue #5835: Deprecate PyOS_ascii_formatd.
- Issue #4971: Fix titlecase for characters that are their own
titlecase, but not their own uppercase.
- Issue #5283: Setting __class__ in __del__ caused a segfault.
- Issue #5816: complex(repr(z)) now recovers z exactly, even when
z involves nans, infs or negative zeros.
- Issue #3166: Make int -> float conversions correctly rounded.
- Issue #1869 (and many duplicates): make round(x, n) correctly
rounded for a float x, by using the decimal <-> binary conversions
from Python/dtoa.c. As a consequence, (e.g.) round(x, 2) now
consistently agrees with format(x, '.2f').
- Issue #5787: object.__getattribute__(some_type, "__bases__") segfaulted on
some builtin types.
- Issue #5772: format(1e100, '<') produces '1e+100', not '1.0e+100'.
- Issue #5515: str.format() type 'n' combined with commas and leading
zeros no longer gives odd results with ints and floats.
- Implement PEP 378, Format Specifier for Thousands Separator, for
floats.
- The str function switches to exponential notation at
1e11, not 1e12. This avoids printing 13 significant digits in
situations where only 12 of them are correct. Example problem
value: str(1e11 + 0.5). (This minor issue has existed in 2.x for a
long time.)
- Issue #1580: On most platforms, use a 'short' float repr: for a
finite float x, repr(x) now outputs a string based on the shortest
sequence of decimal digits that rounds to x. Previous behaviour was
to output 17 significant digits and then strip trailing zeros.
Another minor difference is that the new repr switches to
exponential notation at 1e16 instead of the previous 1e17; this
avoids misleading output in some cases.
There's a new sys attribute sys.float_repr_style, which takes
the value 'short' to indicate that we're using short float repr,
and 'legacy' if the short float repr isn't available for one
reason or another.
The float repr change involves incorporating David Gay's 'perfect
rounding' code into the Python core (it's in Python/dtoa.c). As a
secondary consequence, all string-to-float and float-to-string
conversions (including all float formatting operations) will be
correctly rounded on these platforms.
See issue #1580 discussions for details of platforms for which
this change does not apply.
- Issue #5759: float() didn't call __float__ on str subclasses.
- The string.maketrans() function is deprecated; there is a new static method
maketrans() on the bytes and bytearray classes. This removes confusion about
the types string.maketrans() is supposed to work with, and mirrors the
methods available on the str class.
- Issue #2170: refactored xml.dom.minidom.normalize, increasing both
its clarity and its speed.
- Issue #1113244: Py_XINCREF, Py_DECREF, Py_XDECREF: Add ``do { ... } while (0)``
to avoid compiler warnings.
- Issue #3739: The unicode-internal encoder now reports the number of characters
consumed like any other encoder (instead of the number of bytes).
Installation
------------
- Issue #5756: Install idle and pydoc with a 3 suffix.
Library
-------
- Issue #8203: Fix IDLE Credits dialog: view_file() uses its encoding argument.
- Issue #5311: bdist_msi can now build packages that do not depend on a
specific Python version.
- Issue #5150: IDLE's format menu now has an option to strip trailing
whitespace.
- Issue #5940: distutils.command.build_clib.check_library_list was not doing
the right type checkings anymore.
- Issue #4875: On win32, ctypes.util.find_library does no longer
return directories.
- Issue #5142: Add the ability to skip modules while stepping to pdb.
- Issue #1309567: Fix linecache behavior of stripping subdirectories when
looking for files given by a relative filename.
- Issue #5923: Update the ``turtle`` module to version 1.1, add two new
turtle demos in Demo/turtle.
- Issue #5692: In :class:`zipfile.Zipfile`, fix wrong path calculation when
extracting a file to the root directory.
- Issue #5913: os.listdir() should fail for empty path on windows.
- Issue #5084: unpickling now interns the attribute names of pickled objects,
saving memory and avoiding growth in size of subsequent pickles. Proposal
and original patch by Jake McGuire.
- The json module now works exclusively with str and not bytes.
- Issue #3959: The ipaddr module has been added to the standard library.
Contributed by Google.
- Issue #3002: ``shutil.copyfile()`` and ``shutil.copytree()`` now raise an
error when a named pipe is encountered, rather than blocking infinitely.
- Issue #5857: tokenize.tokenize() now returns named tuples.
- Issue #4305: ctypes should now build again on mipsel-linux-gnu
- Issue #1734234: Massively speedup ``unicodedata.normalize()`` when the
string is already in normalized form, by performing a quick check beforehand.
Original patch by Rauli Ruohonen.
- Issue #5853: calling a function of the mimetypes module from several threads
at once could hit the recursion limit if the mimetypes database hadn't been
initialized before.
- Issue #5854: Updated __all__ to include some missing names and remove some
names which should not be exported.
- Issue #3102: All global symbols that the _ctypes extension defines
are now prefixed with 'Py' or '_ctypes'.
- Issue #5041: ctypes does now allow pickling wide character.
- Issue #5812: For the two-argument form of the Fraction constructor,
Fraction(m, n), m and n are permitted to be arbitrary Rational
instances.
- Issue #5812: Fraction('1e6') is valid: more generally, any string
that's valid for float() is now valid for Fraction(), with the
exception of strings representing NaNs and infinities.
- Issue #5734: BufferedRWPair was poorly tested and had several glaring
bugs. Patch by Brian Quinlan.
- Issue #1161031: fix readwrite select flag handling: POLLPRI now
results in a handle_expt_event call, not handle_read_event, and POLLERR
and POLLNVAL now call handle_close, not handle_expt_event. Also,
dispatcher now has an 'ignore_log_types' attribute for suppressing
log messages, which is set to 'warning' by default.
- Issue #2703: SimpleXMLRPCDispatcher.__init__: Provide default values for
new arguments introduced in 2.5.
- Issue #5828 (Invalid behavior of unicode.lower): Fixed bogus logic in
makeunicodedata.py and regenerated the Unicode database (This fixes
u'\u1d79'.lower() == '\x00').
Extension Modules
-----------------
- Issue #5881: Remove old undocumented compatibility interfaces in hashlib and
pwd.
- Issue #5463: In struct module, remove deprecated float coercion
for integer type codes: struct.pack('L', 0.3) should now raise
an error. The _PY_STRUCT_FLOAT_COERCE constant has been removed.
The version number has been bumped to 0.3.
- Issue #5359: Readd the Berkeley DB detection code to allow _dbm be built
using Berkeley DB.
Tests
-----
- Issue #5354: New test support function import_fresh_module() makes
it easy to import both normal and optimised versions of modules.
test_heapq and test_warnings have been adjusted to use it, tests for
other modules with both C and Python implementations in the stdlib
can be adjusted to use it over time.
- Issue #5837: Certain sequences of calls to set() and unset() for
support.EnvironmentVarGuard objects restored the environment variables
incorrectly on __exit__.
C-API
-----
- Issue #5630: A replacement PyCObject API, PyCapsule, has been added.
What's New in Python 3.1 alpha 2?
=================================
*Release date: 2009-4-4*
Core and Builtins
-----------------
- Implement PEP 378, Format Specifier for Thousands Separator, for
integers.
- Issue #5666: Py_BuildValue's 'c' code should create byte strings.
- Issue #5499: The 'c' code for argument parsing functions now only accepts a
byte, and the 'C' code only accepts a unicode character.
- Fix a problem in PyErr_NormalizeException that leads to "undetected errors"
when hitting the recursion limit under certain circumstances.
- Issue #1665206: Remove the last eager import in _warnings.c and make it lazy.
- Fix a segfault when running test_exceptions with coverage, caused by
insufficient checks in accessors of Exception.__context__.
- Issue #5604: non-ASCII characters in module name passed to
imp.find_module() were converted to UTF-8 while the path is
converted to the default filesystem encoding, causing nonsense.
- Issue #5126: str.isprintable() returned False for space characters.
- Issue #4865: On MacOSX /Library/Python/2.7/site-packages is added to
the end sys.path, for compatibility with the system install of Python.
- Issue #4688: Add a heuristic so that tuples and dicts containing only
untrackable objects are not tracked by the garbage collector. This can
reduce the size of collections and therefore the garbage collection overhead
on long-running programs, depending on their particular use of datatypes.
- Issue #5512: Rewrite PyLong long division algorithm (x_divrem) to
improve its performance. Long divisions and remainder operations
are now between 50% and 150% faster.
- Issue #4258: Make it possible to use base 2**30 instead of base
2**15 for the internal representation of integers, for performance
reasons. Base 2**30 is enabled by default on 64-bit machines. Add
--enable-big-digits option to configure, which overrides the
default. Add sys.int_info structseq to provide information about
the internal format.
- Issue #4474: PyUnicode_FromWideChar now converts characters outside
the BMP to surrogate pairs, on systems with sizeof(wchar_t) == 4
and sizeof(Py_UNICODE) == 2.
- Issue #5237: Allow auto-numbered fields in str.format(). For
example: '{} {}'.format(1, 2) == '1 2'.
- Issue #5392: when a very low recursion limit was set, the interpreter would
abort with a fatal error after the recursion limit was hit twice.
- Issue #3845: In PyRun_SimpleFileExFlags avoid invalid memory access with
short file names.
Library
-------
- Issue #2625: added missing items() call to the for loop in
mailbox.MH.get_message().
- Issue #5640: Fix _multibytecodec so that CJK codecs don't repeat
error substitutions from non-strict codec error callbacks in
incrementalencoder and StreamWriter.
- Issue #5656: Fix the coverage reporting when running the test suite with
the -T argument.
- Issue #5647: MutableSet.__iand__() no longer mutates self during iteration.
- Issue #5624: Fix the _winreg module name still used in several modules.
- Issue #5628: Fix io.TextIOWrapper.read() with a unreadable buffer.
- Issue #5619: Multiprocessing children disobey the debug flag and causes
popups on windows buildbots. Patch applied to work around this issue.
- Issue #5400: Added patch for multiprocessing on netbsd compilation/support
- Issue #5387: Fixed mmap.move crash by integer overflow.
- Issue #5261: Patch multiprocessing's semaphore.c to support context
manager use: "with multiprocessing.Lock()" works now.
- Issue #5236: Change time.strptime() to only take strings. Didn't work with
bytes already but the failure was non-obvious.
- Issue #5177: Multiprocessing's SocketListener class now uses
socket.SO_REUSEADDR on all connections so that the user no longer needs
to wait 120 seconds for the socket to expire.
- Issue #5595: Fix UnboundedLocalError in ntpath.ismount().
- Issue #1174606: Calling read() without arguments of an unbounded file
(typically /dev/zero under Unix) could crash the interpreter.
- The max_buffer_size arguments of io.BufferedWriter, io.BufferedRWPair, and
io.BufferedRandom have been deprecated for removal in Python 3.2.
- Issue #5068: Fixed the tarfile._BZ2Proxy.read() method that would loop
forever on incomplete input. That caused tarfile.open() to hang when used
with mode 'r' or 'r:bz2' and a fileobj argument that contained no data or
partial bzip2 compressed data.
- Issue #2110: Add support for thousands separator and 'n' type
specifier to Decimal.__format__
- Fix Decimal.__format__ bug that swapped the meanings of the '<' and
'>' alignment characters.
- The error detection code in FileIO.close() could fail to reflect the `errno`
value, and report it as -1 instead.
- Issue #5016: FileIO.seekable() could return False if the file position
was negative when truncated to a C int. Patch by Victor Stinner.
Extension Modules
-----------------
- Issue #5391: mmap now deals exclusively with bytes.
- Issue #5463: In struct module, remove deprecated overflow wrapping
when packing an integer: struct.pack('=L', -1) now raises
struct.error instead of returning b'\xff\xff\xff\xff'. The
_PY_STRUCT_RANGE_CHECKING and _PY_STRUCT_OVERFLOW_MASKING constants
have been removed from the struct module.
What's New in Python 3.1 alpha 1
================================
*Release date: 2009-03-07*
Core and Builtins
-----------------
- The io module has been reimplemented in C for speed.
- Give dict views an informative __repr__.
- Issue #5247: Improve error message when unknown format codes are
used when using str.format() with str, int, and float arguments.
- Issue #5249: time.strftime returned malformed string when format string
contained non ascii character on windows.
- Issue #4626: compile(), exec(), and eval() ignore the coding cookie if the
source has already been decoded into str.
- Issue #5186: Reduce hash collisions for objects with no __hash__ method by
rotating the object pointer by 4 bits to the right.
- Issue #4575: Fix Py_IS_INFINITY macro to work correctly on x87 FPUs:
it now forces its argument to double before testing for infinity.
- Issue #5137: Make len() correctly raise a TypeError when a __len__ method
returns a non-number type.
- Issue #5182: Removed memoryview.__str__.
- Issue #1717: Removed builtin cmp() function, dropped tp_compare
slot, the C API functions PyObject_Compare and PyUnicode_Compare and
the type definition cmpfunc. The tp_compare slot has been renamed
to tp_reserved, and is reserved for future usage.
- Issue #1242657: the __len__() and __length_hint__() calls in several tools
were suppressing all exceptions. These include list() and bytearray().
- Issue #4707: round(x, n) now returns an integer if x is an integer.
Previously it returned a float.
- Issue #4753: By enabling a configure option named '--with-computed-gotos'
on compilers that support it (notably: gcc, SunPro, icc), the bytecode
evaluation loop is compiled with a new dispatch mechanism which gives
speedups of up to 20%, depending on the system, on various benchmarks.
- Issue #4874: Most builtin decoders now reject unicode input.
- Issue #4842: Don't allow trailing 'L' when constructing an integer
from a string.
- Issue #4991: os.fdopen now raises an OSError for invalid file descriptors.
- Issue #4838: When a module is deallocated, free the memory backing the
optional module state data.
- Issue #4910: Rename nb_long slot to nb_reserved, and change its
type to ``(void *)``.
- Issue #4935: The overflow checking code in the expandtabs() method common
to str, bytes and bytearray could be optimized away by the compiler, letting
the interpreter segfault instead of raising an error.
- Issue #3720: Fix a crash when an iterator modifies its class and removes its
__next__ method.
- Issue #4910: Builtin int() function and PyNumber_Long/PyNumber_Int API
function no longer attempt to call the __long__ slot to convert an object
to an integer. Only the __int__ and __trunc__ slots are examined.
- Issue #4893: Use NT threading on CE.
- Issue #4915: Port sysmodule to Windows CE.
- Issue #4868: utf-8, utf-16 and latin1 decoding are now 2x to 4x faster. The
common cases are optimized thanks to a dedicated fast path and a moderate
amount of loop unrolling.
- Issue #4074: Change the criteria for doing a full garbage collection (i.e.
collecting the oldest generation) so that allocating lots of objects without
destroying them does not show quadratic performance. Based on a proposal by
Martin von Löwis at
http://mail.python.org/pipermail/python-dev/2008-June/080579.html.
- Issue #4604: Some objects of the I/O library could still be used after
having been closed (for instance, a read() call could return some
previously buffered data). Patch by Dmitry Vasiliev.
- Issue #4705: Fix the -u ("unbuffered binary stdout and stderr") command-line
flag to work properly. Furthermore, when specifying -u, the text stdout
and stderr streams have line-by-line buffering enabled (the default being
to buffer arbitrary chunks of data).
- The internal table, _PyLong_DigitValue, is now an array of unsigned chars
instead of ints (reducing its size from 4 to 8 times thereby reducing
Python's overall memory).
- Issue #1180193: When importing a module from a .pyc (or .pyo) file with
an existing .py counterpart, override the co_filename attributes of all
code objects if the original filename is obsolete (which can happen if the
file has been renamed, moved, or if it is accessed through different paths).
Patch by Ziga Seilnacht and Jean-Paul Calderone.
- Issue #4580: Fix slicing of memoryviews when the item size is greater than
one byte. Also fixes the meaning of len() so that it returns the number of
items, rather than the size in bytes.
- Issue #4075: Use OutputDebugStringW in Py_FatalError.
- Issue #4747: When the terminal does not use utf-8, executing a script with
non-ascii characters in its name could fail with a "SyntaxError: None" error.
- Issue #4797: IOError.filename was not set when ``_fileio.FileIO`` failed
to open file with a bytes filename on Windows.
- Issue #3680: Reference cycles created through a dict, set or deque iterator
did not get collected.
- Issue #4701: PyObject_Hash now implicitly calls PyType_Ready on types
where the tp_hash and tp_dict slots are both NULL.
- Issue #4759: None is now allowed as the first argument of
bytearray.translate(). It was always allowed for bytes.translate().
- Added test case to ensure attempts to read from a file opened for writing
fail.
- Issue #3106: Speedup some comparisons (str/str and int/int).
- Issue #2183: Simplify and optimize bytecode for list, dict and set
comprehensions. Original patch for list comprehensions by Neal Norwitz.
- Issue #2467: gc.DEBUG_STATS reported invalid elapsed times. Also, always
print elapsed times, not only when some objects are uncollectable /
unreachable. Original patch by Neil Schemenauer.
- Issue #3439: Add a bit_length method to int.
- Issue #2173: When getting device encoding, check that return value of
nl_langinfo is not the empty string. This was causing silent build
failures on OS X.
- Issue #4597: Fixed several opcodes that weren't always propagating
exceptions.
- Issue #4589: Fixed exception handling when the __exit__ function of a
context manager returns a value that cannot be converted to a bool.
- Issue #4445: Replace "sizeof(PyBytesObject)" with
"offsetof(PyBytesObject, ob_sval) + 1" when allocating memory for
bytes instances. On a typical machine this saves 3 bytes of memory
(on average) per allocation of a bytes instance.
- Issue #4533: File read operation was dreadfully slow due to a slowly
growing read buffer. Fixed by using the same growth rate algorithm as
Python 2.x.
- Issue #4509: Various issues surrounding resize of bytearray objects to
which there are buffer exports (e.g. memoryview instances).
- Issue #4233: Changed semantic of ``_fileio.FileIO``'s ``close()``
method on file objects with closefd=False. The file descriptor is still
kept open but the file object behaves like a closed file. The ``FileIO``
object also got a new readonly attribute ``closefd``.
- Issue #4569: Interpreter crash when mutating a memoryview with an item size
larger than 1.
- Issue #4748: Lambda generators no longer return a value.
- The re.sub(), re.subn() and re.split() functions now accept a flags parameter.
- Issue #5108: Handle %s like %S, %R and %A in PyUnicode_FromFormatV(): Call
PyUnicode_DecodeUTF8() once, remember the result and output it in a second
step. This avoids problems with counting UTF-8 bytes that ignores the effect
of using the replace error handler in PyUnicode_DecodeUTF8().
Library
-------
- Issue #7071: byte-compilation in Distutils is now done with respect to
sys.dont_write_bytecode.
- Issue #7066: archive_util.make_archive now restores the cwd if an error is
raised. Initial patch by Ezio Melotti.
- Issue #6516: Added owner/group support when creating tar archives in
Distutils.
- Issue #6954: Fixed crash when using DISTUTILS_DEBUG flag in Distutils.
- Issue #6163: Fixed HP-UX runtime library dir options in
distutils.unixcompiler. Initial patch by Sridhar Ratnakumar and
Michael Haubenwallner.
- Issue #6693: New functions in site.py to get user/global site packages paths.
- Issue #6511: ZipFile now raises BadZipfile (instead of an IOError) when
opening an empty or very small file.
- Issue #6545: Removed assert statements in distutils.Extension, so the
behavior is similar when used with -O.
- unittest has been split up into a package. All old names should still work.
- Issue #6466: now distutils.cygwinccompiler and distutils.emxccompiler
uses the same refactored function to get gcc/ld/dllwrap versions numbers.
It's `distutils.util.get_compiler_versions`. Added deprecation warnings
for the obsolete get_versions() functions.
- Issue #6433: fixed issues with multiprocessing.pool.map hanging on empty list
- Issue #6314: logging: Extra checks on the "level" argument in more places.
- Issue #2622: Fixed an ImportError when importing email.message from a
standalone application built with py2exe or py2app.
- Issue #6455: Fixed test_build_ext under win32.
- Issue #6377: Enabled the compiler option, and deprecate its usage as an
attribute.
- Issue #6413: Fixed the log level in distutils.dist for announce.
- Issue #6403: Fixed package path usage in build_ext.
- Issues #5155, 5313, 5331: multiprocessing.Process._bootstrap was
unconditionally calling "os.close(sys.stdin.fileno())" resulting in file
descriptor errors
- Issue #6365: Distutils build_ext inplace mode was copying the compiled
extension in a subdirectory if the extension name had dots.
- Issue #6164: Added an AIX specific linker argument in Distutils
unixcompiler. Original patch by Sridhar Ratnakumar.
- Issue #6286: Now Distutils upload command is based on urllib2 instead of
httplib, allowing the usage of http_proxy.
- Issue #6287: Added the license field in Distutils documentation.
- Issue #6263: Fixed syntax error in distutils.cygwincompiler.
- Issue #5201: distutils.sysconfig.parse_makefile() now understands `$$`
in Makefiles. This prevents compile errors when using syntax like:
`LDFLAGS='-rpath=\$$LIB:/some/other/path'`. Patch by Floris Bruynooghe.
- Issue #6131: test_modulefinder leaked when run after test_distutils.
Patch by Hirokazu Yamamoto.
- Issue #6048: Now Distutils uses the tarfile module in archive_util.
- Issue #6062: In distutils, fixed the package option of build_ext. Feedback
and tests on pywin32 by Tim Golden.
- Issue #6053: Fixed distutils tests on win32. patch by Hirokazu Yamamoto.
- Issue #6046: Fixed the library extension when distutils build_ext is used
inplace. Initial patch by Roumen Petrov.
- Issue #6041: Now distutils `sdist` and `register` commands use `check` as a
subcommand.
- Issue #6022: a test file was created in the current working directory by
test_get_outputs in Distutils.
- Issue #5977: distutils build_ext.get_outputs was not taking into account the
inplace option. Initial patch by kxroberto.
- Issue #5984: distutils.command.build_ext.check_extensions_list checks were broken
for old-style extensions.
- Issue #5976: Fixed Distutils test_check_environ.
- Issue #5941: Distutils build_clib command was not working anymore because
of an incomplete costumization of the archiver command. Added ARFLAGS in the
Makefile besides AR and make Distutils use it. Original patch by David
Cournapeau.
- Issue #2245: aifc now skips chunk types it doesn't recognize, per spec.
- Issue #5874: distutils.tests.test_config_cmd is not locale-sensitive
anymore.
- Issue #5810: Fixed Distutils test_build_scripts so it uses
sysconfig.get_config_vars.
- Issue #4951: Fixed failure in test_httpservers.
- Issue #5795: Fixed test_distutils failure on Debian ppc.
- Issue #5607: fixed Distutils test_get_platform for Mac OS X fat binaries.
- Issue #5741: don't disallow "%%" (which is an escape for "%") when setting
a value in SafeConfigParser.
- Issue #5732: added a new command in Distutils: check.
- Issue #5731: Distutils bdist_wininst no longer worked on non-Windows
platforms. Initial patch by Paul Moore.
- Issue #5095: Added bdist_msi to the list of bdist supported formats.
Initial fix by Steven Bethard.
- Issue #1491431: Fixed distutils.filelist.glob_to_re for edge cases.
Initial fix by Wayne Davison.
- Issue #5694: removed spurious test output in Distutils (test_clean).
- Issue #1326077: fix the formatting of SyntaxErrors by the traceback module.
- Issue #1665206 (partially): Move imports in cgitb to the top of the module
instead of performing them in functions. Helps prevent import deadlocking in
threads.
- Issue #2522: locale.format now checks its first argument to ensure it has
been passed only one pattern, avoiding mysterious errors where it appeared
that it was failing to do localization.
- Issue #5583: Added optional Extensions in Distutils. Initial patch by Georg
Brandl.
- Issue #1222: locale.format() bug when the thousands separator is a space
character.
- Issue #5472: Fixed distutils.test_util tear down. Original patch by
Tim Golden.
- collections.deque() objects now have a read-only attribute called maxlen.
- Issue #2638: Show a window constructed with tkSimpleDialog.Dialog only after
it is has been populated and properly configured in order to prevent
window flashing.
- Issue #4792: Prevent a segfault in _tkinter by using the
guaranteed to be safe interp argument given to the PythonCmd in place of
the Tcl interpreter taken from a PythonCmd_ClientData.
- Issue #5193: Guarantee that tkinter.Text.search returns a string.
- Issue #5394: removed > 2.3 syntax from distutils.msvc9compiler.
Original patch by Akira Kitada.
- Issue #5334: array.fromfile() failed to insert values when EOFError was raised.
- Issue #5385: Fixed mmap crash after resize failure on windows.
- Issue #5179: Fixed subprocess handle leak on failure on windows.
- PEP 372: Added collections.OrderedDict().
- The _asdict() for method for namedtuples now returns an OrderedDict().
- configparser now defaults to using an ordered dictionary.
- Issue #5401: Fixed a performance problem in mimetypes when ``from mimetypes
import guess_extension`` was used.
- Issue #1733986: Fixed mmap crash in accessing elements of second map object
with same tagname but larger size than first map. (Windows)
- Issue #5386: mmap.write_byte didn't check map size, so it could cause buffer
overrun.
- Issue #1533164: Installed but not listed ``*.pyo`` was breaking Distutils
bdist_rpm command.
- Issue #5378: added --quiet option to Distutils bdist_rpm command.
- Issue #5052: make Distutils compatible with 2.3 again.
- Issue #5316: Fixed buildbot failures introduced by multiple inheritance
in Distutils tests.
- Issue #5287: Add exception handling around findCaller() call to help out
IronPython.
- Issue #5282: Fixed mmap resize on 32bit windows and unix. When offset > 0,
The file was resized to wrong size.
- Issue #5292: Fixed mmap crash on its boundary access m[len(m)].
- Issue #2279: distutils.sdist.add_defaults now add files
from the package_data and the data_files metadata.
- Issue #5257: refactored all tests in distutils, so they use
support.TempdirManager, to avoid writing in the tests directory.
- Issue #4524: distutils build_script command failed with --with-suffix=3.
Initial patch by Amaury Forgeot d'Arc.
- Issue #2461: added tests for distutils.util
- Issue #4998: The memory saving effect of __slots__ had been lost on Fractions
which inherited from numbers.py which did not have __slots__ defined. The
numbers hierarchy now has its own __slots__ declarations.
- Issue #4631: Fix urlopen() result when an HTTP response uses chunked
encoding.
- Issue #5203: Fixed ctypes segfaults when passing a unicode string to a
function without argtypes (only occurs if HAVE_USABLE_WCHAR_T is false).
- Issue #3386: distutils.sysconfig.get_python_lib prefix argument was ignored
under NT and OS2. Patch by Philip Jenvey.
- Issue #5128: Make compileall properly inspect bytecode to determine if needs
to be recreated. This avoids a timing hole thanks to the old reliance on the
ctime of the files involved.
- Issue #5122: Synchronize tk load failure check to prevent a potential
deadlock.
- Issue #1818: collections.namedtuple() now supports a keyword argument
'rename' which lets invalid fieldnames be automatically converted to
positional names in the form, _1, _2, ...
- Issue #4890: Handle empty text search pattern in Tkinter.Text.search.
- Issue #4512 (part 2): Promote ``ZipImporter._get_filename()`` to be a
public documented method ``ZipImporter.get_filename()``.
- Issue #4195: The ``runpy`` module (and the ``-m`` switch) now support
the execution of packages by looking for and executing a ``__main__``
submodule when a package name is supplied. Initial patch by Andi
Vajda.
- Issue #1731706: Call Tcl_ConditionFinalize for Tcl_Conditions that will
not be used again (this requires Tcl/Tk 8.3.1), also fix a memory leak in
Tkapp_Call when calling from a thread different than the one that created
the Tcl interpreter. Patch by Robert Hancock.
- Issue #4285: Change sys.version_info to be a named tuple. Patch by
Ross Light.
- Issue #1520877: Now distutils.sysconfig reads $AR from the
environment/Makefile. Patch by Douglas Greiman.
- Issue #1276768: The verbose option was not used in the code of
distutils.file_util and distutils.dir_util.
- Issue #5132: Fixed trouble building extensions under Solaris with
--enabled-shared activated. Initial patch by Dave Peterson.
- Issue #1581476: Always use the Tcl global namespace when calling into Tcl.
- The shelve module now defaults to pickle protocol 3.
- Fix a bug in the trace module where a bytes object from co_lnotab had its
items being passed through ord().
- Issue #2047: shutil.move() could believe that its destination path was
inside its source path if it began with the same letters (e.g. "src" vs.
"src.new").
- Added the ttk module. See issue #2983: Ttk support for Tkinter.
- Removed isSequenceType(), isMappingType, and isNumberType() from the
operator module; use the abstract base classes instead. Also removed
the repeat() function; use mul() instead.
- Issue #5021: doctest.testfile() did not create __name__ and
collections.namedtuple() relied on __name__ being defined.
- Backport importlib from Python 3.1. Only the import_module() function has
been backported to help facilitate transitions from 2.7 to 3.1.
- Issue #1885: distutils. When running sdist with --formats=tar,gztar
the tar file was overriden by the gztar one.
- Issue #4863: distutils.mwerkscompiler has been removed.
- Added a new itertools functions: combinations_with_replacement()
and compress().
- Issue #5032: added a step argument to itertools.count() and
allowed non-integer arguments.
- Fix and properly document the multiprocessing module's logging
support, expose the internal levels and provide proper usage
examples.
- Issue #1672332: fix unpickling of subnormal floats, which was
producing a ValueError on some platforms.
- Issue #3881: Help Tcl to load even when started through the
unreadable local symlink to "Program Files" on Vista.
- Issue #4710: Extract directories properly in the zipfile module;
allow adding directories to a zipfile.
- Issue #3807: _multiprocessing build fails when configure is passed
--without-threads argument. When this occurs, _multiprocessing will
be disabled, and not compiled.
- Issue #5008: When a file is opened in append mode with the new IO library,
do an explicit seek to the end of file (so that e.g. tell() returns the
file size rather than 0). This is consistent with the behaviour of the
traditional 2.x file object.
- Issue #5013: Fixed a bug in FileHandler which occurred when the delay
parameter was set.
- Issue #4842: Always append a trailing 'L' when pickling longs using
pickle protocol 0. When reading, the 'L' is optional.
- Add the importlib package.
- Issue #4301: Patch the logging module to add processName support, remove
_check_logger_class from multiprocessing.
- Issue #3325: Remove python2.x try: except: imports for old cPickle from
multiprocessing.
- Issue #4959: inspect.formatargspec now works for keyword only arguments
without defaults.
- Issue #3321: ``_multiprocessing.Connection()`` doesn't check handle; added checks
for Unix machines for negative handles and large int handles. Without this check
it is possible to segfault the interpreter.
- Issue #4449: AssertionError in mp_benchmarks.py, caused by an underlying issue
in sharedctypes.py.
- Issue #1225107: inspect.isclass() returned True for instances with a custom
__getattr__.
- Issue #3826 and #4791: The socket module now closes the underlying socket
appropriately when it is being used via socket.makefile() objects
rather than delaying the close by waiting for garbage collection to do it.
- Issue #1696199: Add collections.Counter() for rapid and convenient
counting.
- Issue #3860: GzipFile and BZ2File now support the context manager protocol.
- Issue #4867: Fixed a crash in ctypes when passing a string to a
function without defining argtypes.
- Issue #4272: Add an optional argument to the GzipFile constructor to override
the timestamp in the gzip stream. The default value remains the current time.
The information can be used by e.g. gunzip when decompressing. Patch by
Jacques Frechet.
- Restore Python 2.3 compatibility for decimal.py.
- Issue #3638: Remove functions from _tkinter module level that depend on
TkappObject to work with multiple threads.
- Issue #4718: Adapt the wsgiref package so that it actually works with
Python 3.x, in accordance with the `official amendments of the spec
<http://www.wsgi.org/wsgi/Amendments_1.0>`_.
- Issue #4796: Added Decimal.from_float() and Context.create_decimal_from_float()
to the decimal module.
- Fractions.from_float() no longer loses precision for integers too big to
cast as floats.
- Issue #4812: add missing underscore prefix to some internal-use-only
constants in the decimal module. (Dec_0 becomes _Dec_0, etc.)
- Issue #4790: The nsmallest() and nlargest() functions in the heapq module
did unnecessary work in the common case where no key function was specified.
- Issue #4795: inspect.isgeneratorfunction() returns False instead of None when
the function is not a generator.
- Issue #4702: Throwing a DistutilsPlatformError instead of IOError in case
no MSVC compiler is found under Windows. Original patch by Philip Jenvey.
- Issue #4646: distutils was choking on empty options arg in the setup
function. Original patch by Thomas Heller.
- Issue #3767: Convert Tk object to string in tkColorChooser.
- Issue #3248: Allow placing ScrolledText in a PanedWindow.
- Issue #4444: Allow assertRaises() to be used as a context handler, so that
the code under test can be written inline if more practical.
- Issue #4739: Add pydoc help topics for symbols, so that e.g. help('@')
works as expected in the interactive environment.
- Issue #4756: zipfile.is_zipfile() now supports file-like objects. Patch by
Gabriel Genellina.
- Issue #4574: reading an UTF16-encoded text file crashes if \r on 64-char
boundary.
- Issue #4223: inspect.getsource() will now correctly display source code
for packages loaded via zipimport (or any other conformant PEP 302
loader). Original patch by Alexander Belopolsky.
- Issue #4201: pdb can now access and display source code loaded via
zipimport (or any other conformant PEP 302 loader). Original patch by
Alexander Belopolsky.
- Issue #4197: doctests in modules loaded via zipimport (or any other PEP
302 conformant loader) will now work correctly in most cases (they
are still subject to the constraints that exist for all code running
from inside a module loaded via a PEP 302 loader and attempting to
perform IO operations based on __file__). Original patch by
Alexander Belopolsky.
- Issues #4082 and #4512: Add runpy support to zipimport in a manner that
allows backporting to maintenance branches. Original patch by
Alexander Belopolsky.
- Issue #4163: textwrap module: allow word splitting on a hyphen preceded by
a non-ASCII letter.
- Issue #4616: TarFile.utime(): Restore directory times on Windows.
- Issue #4021: tokenize.detect_encoding() now raises a SyntaxError when the
codec cannot be found. This is for compatibility with the builtin behavior.
- Issue #4084: Fix max, min, max_mag and min_mag Decimal methods to
give correct results in the case where one argument is a quiet NaN
and the other is a finite number that requires rounding.
- Issue #4483: _dbm module now builds on systems with gdbm & gdbm_compat
libs.
- Added the subprocess.check_call_output() convenience function to get output
from a subprocess on success or raise an exception on error.
- Issue #1055234: cgi.parse_header(): Fixed parsing of header parameters to
support unusual filenames (such as those containing semi-colons) in
Content-Disposition headers.
- Issue #4384: Added logging integration with warnings module using
captureWarnings(). This change includes a NullHandler which does nothing;
it will be of use to library developers who want to avoid the "No handlers
could be found for logger XXX" message which can appear if the library user
doesn't configure logging.
- Issue #3741: DISTUTILS_USE_SDK set causes msvc9compiler.py to raise an
exception.
- Issue #4529: fix the parser module's validation of try-except-finally
statements.
- Issue #4458: getopt.gnu_getopt() now recognizes a single "-" as an argument,
not a malformed option.
- Added the subprocess.check_output() convenience function to get output
from a subprocess on success or raise an exception on error.
- Issue #4542: On Windows, binascii.crc32 still accepted str as binary input;
the corresponding tests now pass.
- Issue #4537: webbrowser.UnixBrowser would fail to open the browser because
it was calling the wrong open() function.
- Issue #1055234: cgi.parse_header(): Fixed parsing of header parameters to
support unusual filenames (such as those containing semi-colons) in
Content-Disposition headers.
- Issue #4861: ctypes.util.find_library(): Robustify. Fix library detection on
biarch systems. Try to rely on ldconfig only, without using objdump and gcc.
- Issue #5104: The socket module now raises OverflowError when 16-bit port and
protocol numbers are supplied outside the allowed 0-65536 range on bind()
and getservbyport().
- Windows locale mapping updated to Vista.
Tools/Demos
-----------
- Issue #4704: remove use of cmp() in pybench, bump its version number to 2.1,
and make it 2.6-compatible.
- Ttk demos added in Demo/tkinter/ttk/
- Issue #4677: add two list comprehension tests to pybench.
Build
-----
- Issue #6094: Build correctly with Subversion 1.7.
- Issue #5847: Remove -n switch on "Edit with IDLE" menu item.
- Issue #5726: Make Modules/ld_so_aix return the actual exit code of the
linker, rather than always exit successfully. Patch by Floris Bruynooghe.
- Issue #4587: Add configure option --with-dbmliborder=db1:db2:... to specify
the order that backends for the dbm extension are checked.
- Link the shared python library with $(MODLIBS).
- Issue #5134: Silence compiler warnings when compiling sqlite with VC++.
- Issue #4494: Fix build with Py_NO_ENABLE_SHARED on Windows.
- Issue #4895: Use _strdup on Windows CE.
- Issue #4472: "configure --enable-shared" now works on OSX
- Issues #4728 and #4060: WORDS_BIGEDIAN is now correct in Universal builds.
- Issue #4389: Add icon to the uninstall entry in "add-and-remove-programs".
- Issue #4289: Remove Cancel button from AdvancedDlg.
- Issue #1656675: Register a drop handler for .py* files on Windows.
- Issue #4120: Exclude manifest from extension modules in VS2008.
- Issue #4091: Install pythonxy.dll in system32 again.
- Issue #4018: Disable "for me" installations on Vista.
- Issue #3758: Add ``patchcheck`` build target to .PHONY.
- Issue #4204: Fixed module build errors on FreeBSD 4.
C-API
-----
- Issue #6624: yArg_ParseTuple with "s" format when parsing argument with
NUL: Bogus TypeError detail string.
- Issue #5175: PyLong_AsUnsignedLongLong now raises OverflowError
for negative arguments. Previously, it raised TypeError.
- Issue #4720: The format for PyArg_ParseTupleAndKeywords can begin with '|'.
- Issue #3632: from the gdb debugger, the 'pyo' macro can now be called when
the GIL is released, or owned by another thread.
- Issue #4122: On Windows, fix a compilation error when using the
Py_UNICODE_ISSPACE macro in an extension module.
Extension Modules
-----------------
- Issue #3745: Fix hashlib to always reject unicode and non buffer-api
supporting objects as input no matter how it was compiled (built in
implementations or external openssl library).
- Issue #4397: Fix occasional test_socket failure on OS X.
- Issue #4279: Fix build of parsermodule under Cygwin.
- Issue #4751: hashlib now releases the GIL when hashing large buffers
(with a hardwired threshold of 2048 bytes), allowing better parallelization
on multi-CPU systems. Contributed by Lukas Lueg (ebfe) and Victor Stinner.
- Issue #4051: Prevent conflict of UNICODE macros in cPickle.
- Issue #4738: Each zlib object now has a separate lock, allowing to compress
or decompress several streams at once on multi-CPU systems. Also, the GIL
is now released when computing the CRC of a large buffer. Patch by ebfe.
- Issue #4228: Pack negative values the same way as 2.4 in struct's L format.
- Issue #1040026: Fix os.times result on systems where HZ is incorrect.
- Issues #3167, #3682: Fix test_math failures for log, log10 on Solaris,
OpenBSD.
- Issue #4583: array.array would not always prohibit resizing when a buffer
has been exported, resulting in an interpreter crash when accessing the
buffer.
- Issue #5228: Make functools.partial objects can now be pickled.
Tests
-----
- Issue #6152: New option '-j'/'--multiprocess' for regrtest allows running
regression tests in parallel, shortening the total runtime.
- Issue #5450: Moved tests involving loading tk from Lib/test/test_tcl to
Lib/tkinter/test/test_tkinter/test_loadtk. With this, these tests demonstrate
the same behaviour as test_ttkguionly (and now also test_tk) which is to
skip the tests if DISPLAY is defined but can't be used.
- regrtest no longer treats ImportError as equivalent to SkipTest. Imports
that should cause a test to be skipped are now done using import_module
from test support, which does the conversion.
- Issue #5083: New 'gui' resource for regrtest.
Docs
----
**(For information about older versions, consult the HISTORY file.)**
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