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Code Issues Projects Releases Packages Wiki Activity Actions 11

Note the updates to range objects.

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Raymond Hettinger 2010-12-05 02:56:21 +00:00
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Doc/whatsnew/3.2.rst
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@ -394,9 +394,16 @@ Some smaller changes made to the core Python language are:
(Added by Antoine Pitrou, :issue:`10093`.) (Added by Antoine Pitrou, :issue:`10093`.)
.. XXX: Issues #9213 and #2690 make the objects returned by range() * :class:`range` objects now support and *index* and *count* methods. This is
more sequence like in accordance with their registration as part of an effort to make more objects fully implement the :class:`collections.Sequence`
implementing the Sequence ABC :term:`abstract base class`. As a result, the language will have a more
uniform API.
In addition, :class:`range` objects now support slicing and negative indices.
This makes *range* more interoperable with lists.
(Contributed by Daniel Stuzback in :issue:`9213` and by Alexander Belopolsky
in :issue:`2690`.)
New, Improved, and Deprecated Modules New, Improved, and Deprecated Modules
@ -730,16 +737,6 @@ Optimizations
A number of small performance enhancements have been added: A number of small performance enhancements have been added:
* JSON decoding performance is improved and memory consumption is reduced
whenever the same string is repeated for multiple keys.
(Contributed by Antoine Pitrou; :issue:`7451`.)
* JSON encoding now uses the C speedups also when the ``sort_keys`` argument
is true.
(Contributed by Raymond Hettinger and Antoine Pitrou, :issue:`10314`.)
* Python's peephole optimizer now recognizes patterns such ``x in {1, 2, 3}`` as * Python's peephole optimizer now recognizes patterns such ``x in {1, 2, 3}`` as
being a test for membership in a set of constants. The optimizer recasts the being a test for membership in a set of constants. The optimizer recasts the
:class:`set` as a :class:`frozenset` and stores the pre-built constant. :class:`set` as a :class:`frozenset` and stores the pre-built constant.
@ -754,16 +751,10 @@ A number of small performance enhancements have been added:
(Patch and additional tests by Dave Malcolm; :issue:`6690`). (Patch and additional tests by Dave Malcolm; :issue:`6690`).
* The fast-search algorithm in stringlib is now used by the :meth:`split`,
:meth:`rsplit`, :meth:`splitlines` and :meth:`replace` methods on
:class:`bytes`, :class:`bytearray` and :class:`str` objects. Likewise, the
algorithm is also used by :meth:`rfind`, :meth:`rindex`, :meth:`rsplit` and
:meth:`rpartition`.
(Patch by Florent Xicluna in :issue:`7622` and :issue:`7462`.)
* Serializing and unserializing data using the :mod:`pickle` module is now * Serializing and unserializing data using the :mod:`pickle` module is now
several times faster. (Contributed by Alexandre Vassalotti, Antoine Pitrou several times faster.
(Contributed by Alexandre Vassalotti, Antoine Pitrou
and the Unladen Swallow team in :issue:`9410` and :issue:`3873`.) and the Unladen Swallow team in :issue:`9410` and :issue:`3873`.)
* The `Timsort algorithm <http://en.wikipedia.org/wiki/Timsort>`_ used in * The `Timsort algorithm <http://en.wikipedia.org/wiki/Timsort>`_ used in
@ -777,6 +768,21 @@ A number of small performance enhancements have been added:
(Patch by Daniel Stuzback in :issue:`9915`.) (Patch by Daniel Stuzback in :issue:`9915`.)
* JSON decoding performance is improved and memory consumption is reduced
whenever the same string is repeated for multiple keys. Aslo, JSON encoding
now uses the C speedups when the ``sort_keys`` argument is true.
(Contributed by Antoine Pitrou in :issue:`7451` and by Raymond Hettinger and
Antoine Pitrou in :issue:`10314`.)
* The fast-search algorithm in stringlib is now used by the :meth:`split`,
:meth:`rsplit`, :meth:`splitlines` and :meth:`replace` methods on
:class:`bytes`, :class:`bytearray` and :class:`str` objects. Likewise, the
algorithm is also used by :meth:`rfind`, :meth:`rindex`, :meth:`rsplit` and
:meth:`rpartition`.
(Patch by Florent Xicluna in :issue:`7622` and :issue:`7462`.)
Unicode Unicode
======= =======
@ -824,7 +830,8 @@ systems.
.. IDLE .. IDLE
==== ====
* Stub * The format menu now has an option to clean-up source files by strip trailing
whitespace (:issue:`5150`).
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