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More notes on 3.1 improvements.

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This commit is contained in:
Raymond Hettinger 2009-04-04 11:59:00 +00:00
parent e7ec57dcfa
commit f41857e183
1 changed files with 57 additions and 2 deletions
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Doc/whatsnew/3.1.rst
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@ -88,12 +88,12 @@ order. The :mod:`collections` module's :meth:`namedtuple._asdict` method now
returns a dictionary with the values appearing in the same order as the
underlying tuple.count The :mod:`json` module is being built-out with an
*object_pairs_hook* to allow OrderedDicts to be built by the decoder.
Support was also builtin for third-party tools like PyYAML.
Support was also added for third-party tools like PyYAML.
.. seealso::
:pep:`372` - Ordered Dictionaries
PEP written by Armin Roancher and Raymond D. Hettinger; implemented by
PEP written by Armin Ronacher and Raymond Hettinger; implemented by
Raymond Hettinger
PEP 378: Format Specifier for Thousands Separator
@ -211,6 +211,48 @@ Some smaller changes made to the core Python language are:
(Contributed by Raymond Hettinger.)
* :class:`collections.deque` objects now have a read-only attribute
called *maxlen*.
(Contributed by Raymond Hettinger.)
* :func:`collections.namedtuple` now supports a keyword argument
*rename* which lets invalid fieldnames be automatically converted to
positional names in the form _0, _1, etc. This is useful when
the field names are being created by an external source such as a
CSV header, SQL field list, or user input.
(Contributed by Raymond Hettinger; :issue:`1818`.)
* :func:`round`(x, n) now returns an integer if *x* is an integer.
Previously it returned a float.
(Contributed by Mark Dickinson; :issue:`4707`.)
* The :func:`re.sub`, :func:`re.subn` and :func:`re.split` functions now
accept a flags parameter.
(Contributed by Gregory Smith.)
* The :mod:`runpy` module which supports the ``-m`` command line switch
now supports the execution of packages by looking for and executing
a ``__main__`` submodule when a package name is supplied.
(Contributed by Andi Vajda; :issue:`4195`.)
* The :mod:`pdb` module can now access and display source code loaded via
:mod:`zipimport` (or any other conformant :pep:`302` loader).
(Contributed by Alexander Belopolsky; :issue:`4201`.)
* :class:`functools.partial` objects can now be pickled.
(Suggested by Antoine Pitrou and Jesse Noller. Implemented by
Jack Diedrich; :issue:`5228`.)
XXX Brett Cannon's importlib package
XXX New unittest assert methods
.. ======================================================================
@ -242,6 +284,19 @@ Major performance enhancements have been added:
(Contributed by Antoine Pitrou, :issue:`4688`.)
* 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.
(Contributed by Antoine Pitrou and Jeffrey Yasskin along with a number
of other participants, :issue:`4753`).
* The decoding of UTF-8, UTF-16 and LATIN-1 is now two to four times
faster.
(Contributed by Antoine Pitrou and Amaury Forgeot d'Arc, :issue:`4868`.)
XXX The JSON module is getting a C extension for speed.
.. ======================================================================