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