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41980caf64
ut-32-be). On narrow builds the codecs combine surrogate pairs in the unicode object into one codepoint on encoding and create surrogate pairs for codepoints outside the BMP on decoding. Lone surrogates are passed through unchanged in all cases. Backport to the trunk will follow.
263 lines
7.0 KiB
Plaintext
263 lines
7.0 KiB
Plaintext
+++++++++++
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Python News
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+++++++++++
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(editors: check NEWS.help for information about editing NEWS using ReST.)
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What's New in Python 3000?
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==========================
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*Release date: XX-XXX-200X*
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TO DO
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-----
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- See PEP 3000, 3100.
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- Weed really old/weird stuff from the library.
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- Use io.py instead of C stdio everywhere.
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- Make strings all Unicode (see branches/py3k-struni).
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- Get rid of various compatibility-related flags (e.g. division flags).
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Core and Builtins
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-----------------
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- PEP 3131: Support non-ASCII identifiers.
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- PEP 3120: Change default encoding to UTF-8.
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- PEP 3123: Use proper C inheritance for PyObject.
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- Removed the __oct__ and __hex__ special methods and added a bin()
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builtin function.
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- PEP 3127: octal literals now start with "0o". Old-style octal literals
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are invalid. There are binary literals with a prefix of "0b".
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This also affects int(x, 0).
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- None, True, False are now keywords.
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- PEP 3119: isinstance() and issubclass() can be overridden.
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- Remove BaseException.message.
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- Remove tuple parameter unpacking (PEP 3113).
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- Remove the f_restricted attribute from frames. This naturally leads to teh
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removal of PyEval_GetRestricted() and PyFrame_IsRestricted().
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- PEP 3132 was accepted. That means that you can do ``a, *b = range(5)``
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to assign 0 to a and [1, 2, 3, 4] to b.
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- range() now returns an iterator rather than a list. Floats are not allowed.
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xrange() is no longer defined.
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- Patch #1660500: hide iteration variable in list comps, add set comps
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and use common code to handle compilation of iterative expressions
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- By default, != returns the opposite of ==, unless the latter returns
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NotImplemented.
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- Patch #1680961: sys.exitfunc has been removed and replaced with a private
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C-level API.
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- PEP 3115: new metaclasses: the metaclass is now specified as a
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keyword arg in the class statement, which can now use the full syntax of
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a parameter list. Also, the metaclass can implement a __prepare__ function
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which will be called to create the dictionary for the new class namespace.
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- The long-deprecated argument "pend" of PyFloat_FromString() has been
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removed.
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- The dir() function has been extended to call the __dir__() method on
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its argument, if it exists. If not, it will work like before. This allows
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customizing the output of dir() in the presence of a __getattr__().
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- Removed support for __members__ and __methods__.
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- Removed indexing/slicing on BaseException.
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- input() became raw_input(): the name input() now implements the
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functionality formerly known as raw_input(); the name raw_input()
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is no longer defined.
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- Classes listed in an 'except' clause must inherit from BaseException.
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- PEP 3106: dict.iterkeys(), .iteritems(), .itervalues() are now gone;
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and .keys(), .items(), .values() return dict views.
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- PEP 3105: print is now a function. Also (not in the PEP) the
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'softspace' attribute of files is now gone (since print() doesn't use
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it). A side effect of this change is that you can get incomplete
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output lines in interactive sessions:
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>>> print(42, end="")
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42>>>
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We may be able to fix this after the I/O library rewrite.
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- PEP 3102: keyword-only arguments.
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- Int/Long unification is complete. The 'long' built-in type
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and literals with trailing 'L' or 'l' have been removed.
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Performance may be sub-optimal (haven't really benchmarked).
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- 'except E, V' must now be spelled as 'except E as V' and deletes V
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at the end of the except clause; V must be a simple name.
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- Added function annotations per PEP 3107.
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- Added nonlocal declaration from PEP 3104
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>>> def f(x):
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... def inc():
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... nonlocal x
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... x += 1
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... return x
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... return inc
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...
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>>> inc = f(0)
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>>> inc()
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1
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>>> inc()
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2
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- Moved intern() to sys.intern().
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- exec is now a function.
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- Renamed nb_nonzero to nb_bool and __nonzero__ to __bool__.
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- Classic classes are a thing of the past. All classes are new style.
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- Exceptions *must* derive from BaseException.
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- Integer division always returns a float. The -Q option is no more.
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All the following are gone:
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* PyNumber_Divide and PyNumber_InPlaceDivide
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* __div__, __rdiv__, and __idiv__
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* nb_divide, nb_inplace_divide
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* operator.div, operator.idiv, operator.__div__, operator.__idiv__
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(Only __truediv__ and __floordiv__ remain, not sure how to handle them
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if we want to re-use __div__ and friends. If we do, it will make
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it harder to write code for both 2.x and 3.x.)
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- 'as' and 'with' are keywords.
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- Absolute import is the default behavior for 'import foo' etc.
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- Removed support for syntax:
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backticks (ie, `x`), <>
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- Removed these Python builtins:
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apply(), callable(), coerce(), execfile(), file(), reduce(), reload()
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- Removed these Python methods:
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{}.has_key
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- Removed these opcodes:
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BINARY_DIVIDE, INPLACE_DIVIDE, UNARY_CONVERT
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- Remove C API support for restricted execution.
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- zip returns an iterator
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- Additions:
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set literals, ellipsis literal
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- Added class decorators per PEP 3129.
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Extension Modules
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-----------------
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- Remove the imageop module. Obsolete long with its unit tests becoming
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useless from the removal of rgbimg and imgfile.
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- Removed these attributes from Python modules:
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* operator module: div, idiv, __div__, __idiv__, isCallable, sequenceIncludes
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* sys module: exc_clear(), exc_type, exc_value, exc_traceback
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Library
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-------
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- Remove the compiler package. Use of the _ast module and (an eventual)
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AST -> bytecode mechanism.
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- Removed these modules:
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* audiodev, Bastion, bsddb185, exceptions, linuxaudiodev,
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md5, MimeWriter, mimify, popen2,
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rexec, sets, sha, stringold, strop, sunaudiodev, timing, xmllib.
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- Moved these modules to Tools/Demos:
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* toaiff
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- Remove obsolete IRIX modules: al/AL, cd/CD, cddb, cdplayer, cl/CL, DEVICE,
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ERRNO, FILE, fl/FL, flp, fm, GET, gl/GL, GLWS, IN, imgfile, IOCTL, jpeg,
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panel, panelparser, readcd, sgi, sv/SV, torgb, WAIT.
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- Remove obsolete functions:
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* commands.getstatus(), os.popen*,
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- Remove functions in the string module that are also string methods;
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Remove string.{letters, lowercase, uppercase}.
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- Remove support for long obsolete platforms: plat-aix3, plat-irix5.
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- Remove xmlrpclib.SlowParser. It was based on xmllib.
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- Patch #1680961: atexit has been reimplemented in C.
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- Add new codecs for UTF-32, UTF-32-LE and UTF-32-BE.
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Build
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-----
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C API
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-----
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- Removed these Python slots:
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__coerce__, __div__, __idiv__, __rdiv__
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- Removed these C APIs:
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PyNumber_Coerce(), PyNumber_CoerceEx(), PyMember_Get, PyMember_Set
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- Removed these C slots/fields:
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nb_divide, nb_inplace_divide
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- Removed these macros:
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staticforward, statichere, PyArg_GetInt, PyArg_NoArgs
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- Removed these typedefs:
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intargfunc, intintargfunc, intobjargproc, intintobjargproc,
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getreadbufferproc, getwritebufferproc, getsegcountproc, getcharbufferproc,
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memberlist
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Tests
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-----
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Documentation
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-------------
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Mac
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---
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- The cfmfile was removed.
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New platforms
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-------------
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Tools/Demos
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-----------
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**(For information about older versions, consult the HISTORY file.)**
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