mirror of https://github.com/python/cpython
Add several items and placeholders
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Andrew M. Kuchling
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b585255f02
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71d5c28d97
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@ -6,7 +6,8 @@
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:Release: |release|
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:Date: |today|
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.. Fix accents on Kristjan Valur Jonsson, Fuerstenau.
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.. Fix accents on Kristjan Valur Jonsson, Fuerstenau, Tarek Ziade.
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.. OrderedDict
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.. $Id$
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Rules for maintenance:
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@ -57,10 +58,18 @@ No release schedule has been decided yet for 2.7.
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.. ========================================================================
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.. Large, PEP-level features and changes should be described here.
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.. Should there be a new section here for 3k migration?
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.. Or perhaps a more general section describing module changes/deprecation?
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.. ========================================================================
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PEP 372: Adding an ordered dictionary to collections
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=============================
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XXX write this
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Several modules will now use :class:`OrderedDict` by default. The
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:mod:`ConfigParser` module uses :class:`OrderedDict` for the list
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of sections and the options within a section.
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The :method:`namedtuple._asdict` method returns an :class:`OrderedDict`
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as well.
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Other Language Changes
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@ -86,30 +95,6 @@ Some smaller changes made to the core Python language are:
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(Contributed by Fredrik Johansson and Victor Stinner; :issue:`3439`.)
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* Integers are now stored internally either in base 2**15 or in base
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2**30, the base being determined at build time. Previously, they
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were always stored in base 2**15. Using base 2**30 gives
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significant performance improvements on 64-bit machines, but
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benchmark results on 32-bit machines have been mixed. Therefore,
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the default is to use base 2**30 on 64-bit machines and base 2**15
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on 32-bit machines; on Unix, there's a new configure option
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--enable-big-digits that can be used to override this default.
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Apart from the performance improvements this change should be
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invisible to end users, with one exception: for testing and
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debugging purposes there's a new structseq ``sys.long_info`` that
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provides information about the internal format, giving the number of
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bits per digit and the size in bytes of the C type used to store
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each digit::
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>>> import sys
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>>> sys.long_info
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sys.long_info(bits_per_digit=30, sizeof_digit=4)
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(Contributed by Mark Dickinson; :issue:`4258`.)
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.. ======================================================================
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@ -129,18 +114,44 @@ A few performance enhancements have been added:
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(Suggested by Martin von Loewis and implemented by Antoine Pitrou;
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:issue:`4074`.)
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* The garbage collector tries to avoid tracking simple containers which
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can't be part of a cycle. As of now, this is true for tuples and dicts
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containing atomic types (such as ints, strings, etc.). Transitively, a dict
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containing tuples of atomic types won't be tracked either. This helps bring
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down the individual cost of each garbage collection, since it decreases the
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number of objects to be considered and traversed by the collector.
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To help diagnosing this optimization, a new function in the :mod:`gc`
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module, :func:`is_tracked`, returns True if a given instance is tracked
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by the garbage collector, False otherwise.
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* The garbage collector tries to avoid tracking simple containers
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which can't be part of a cycle. In Python 2.7, this is now true for
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tuples and dicts containing atomic types (such as ints, strings,
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etc.). Transitively, a dict containing tuples of atomic types won't
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be tracked either. This helps reduce the cost of each
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garbage collection by decreasing the number of objects to be
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considered and traversed by the collector.
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(Contributed by Antoine Pitrou; :issue:`4688`.)
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* Integers are now stored internally either in base 2**15 or in base
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2**30, the base being determined at build time. Previously, they
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were always stored in base 2**15. Using base 2**30 gives
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significant performance improvements on 64-bit machines, but
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benchmark results on 32-bit machines have been mixed. Therefore,
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the default is to use base 2**30 on 64-bit machines and base 2**15
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on 32-bit machines; on Unix, there's a new configure option
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:option:`--enable-big-digits` that can be used to override this default.
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Apart from the performance improvements this change should be
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invisible to end users, with one exception: for testing and
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debugging purposes there's a new structseq ``sys.long_info`` that
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provides information about the internal format, giving the number of
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bits per digit and the size in bytes of the C type used to store
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each digit::
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>>> import sys
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>>> sys.long_info
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sys.long_info(bits_per_digit=30, sizeof_digit=4)
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(Contributed by Mark Dickinson; :issue:`4258`.)
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* The division algorithm for long integers has been made faster
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by tightening the inner loop, doing shifts instead of multiplications,
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and fixing an unnecessary extra iteration.
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Various benchmarks show speedups of between 50% and 150% for long
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integer divisions and modulo operations.
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(Contributed by Mark Dickinson; :issue:`5512`.)
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.. ======================================================================
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@ -153,14 +164,11 @@ changes, sorted alphabetically by module name. Consult the
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:file:`Misc/NEWS` file in the source tree for a more complete list of
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changes, or look through the Subversion logs for all the details.
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* In Distutils, distutils.sdist.add_defaults now uses package_dir and data_files
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to feed MANIFEST.
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* It is not mandatory anymore to store clear text passwords in the
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* It is no longer mandatory to store clear-text passwords in the
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:file:`.pypirc` file when registering and uploading packages to PyPI. As long
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as the username is present in that file, the :mod:`distutils` package will
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prompt for the password if not present. (Added by tarek, with the initial
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contribution of Nathan Van Gheem; :issue:`4394`.)
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prompt for the password if not present. (Added by Tarek Ziade,
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with the initial contribution by Nathan Van Gheem; :issue:`4394`.)
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* The :mod:`bz2` module's :class:`BZ2File` now supports the context
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management protocol, so you can write ``with bz2.BZ2File(...) as f: ...``.
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@ -200,6 +208,13 @@ changes, or look through the Subversion logs for all the details.
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Contributed by Raymond Hettinger; :issue:`1696199`.
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* In Distutils, :func:`distutils.sdist.add_defaults` now uses
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*package_dir* and *data_files* to feed MANIFEST.
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* A new function in the :mod:`gc` module, :func:`is_tracked`, returns
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True if a given instance is tracked by the garbage collector, False
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otherwise. (Contributed by Antoine Pitrou; :issue:`4688`.)
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* The :mod:`gzip` module's :class:`GzipFile` now supports the context
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management protocol, so you can write ``with gzip.GzipFile(...) as f: ...``.
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(Contributed by Hagen Fuerstenau; :issue:`3860`.)
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@ -208,6 +223,17 @@ changes, or look through the Subversion logs for all the details.
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an invalid file descriptor. (Implemented by Benjamin Peterson;
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:issue:`4991`.)
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* The :class:`itertools`
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* The :mod:`json` module was upgraded to version 2.0.9 of the
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simplejson package, which includes a C extension that makes
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encoding and decoding faster.
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(Contributed by Bob Ippolito; :issue:`4136`.)
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To support the new :class:`OrderedDict` type, :func:`json.load`
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now has an optional *object_pairs_hook* parameter that will be called
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with any object literal that decodes to a list of pairs.
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(Contributed by Raymond Hettinger; :issue:`5381`.)
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* The :mod:`pydoc` module now has help for the various symbols that Python
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uses. You can now do ``help('<<')`` or ``help('@')``, for example.
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(Contributed by David Laban; :issue:`4739`.)
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@ -229,6 +255,13 @@ changes, or look through the Subversion logs for all the details.
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(Contributed by Gregory P. Smith.)
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* The :mod:`unittest` module was enhanced in several ways.
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Test cases can raise the :exc:`SkipTest` exception to skip a test.
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(:issue:`1034053`.)
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It will now use 'x' for expected failures
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and 'u' for unexpected successes when run in its verbose mode.
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(Contributed by Benjamin Peterson.)
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* The :func:`is_zipfile` function in the :mod:`zipfile` module will now
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accept a file object, in addition to the path names accepted in earlier
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versions. (Contributed by Gabriel Genellina; :issue:`4756`.)
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@ -236,6 +269,11 @@ changes, or look through the Subversion logs for all the details.
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.. ======================================================================
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.. whole new modules get described in subsections here
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importlib: Importing Modules
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------------------------------
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XXX write this
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ttk: Themed Widgets for Tk
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--------------------------
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@ -294,6 +332,16 @@ Port-Specific Changes: Mac OS X
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-----------------------------------
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Other Changes and Fixes
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=======================
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* The :file:`regrtest.py` script now takes a :option:`--randseed=`
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switch that takes an integer that will be used as the random seed
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for the :option:`-r` option that executes tests in random order.
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The :option:`-r` option also now reports the seed that was used
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(Added by Collin Winter.)
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.. ======================================================================
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Porting to Python 2.7
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