Add various items
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Andrew M. Kuchling
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@ -113,7 +113,13 @@ Some smaller changes made to the core Python language are:
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Optimizations
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-------------
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A few performance enhancements have been added:
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Several performance enhancements have been added:
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.. * A new :program:`configure` option, :option:`--with-computed-gotos`,
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compiles the main bytecode interpreter loop using a new dispatch
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mechanism that gives speedups of up to 20%, depending on the system
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and benchmark. The new mechanism is only supported on certain
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compilers, such as gcc, SunPro, and icc.
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* The garbage collector now performs better when many objects are
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being allocated without deallocating any. A full garbage collection
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@ -158,7 +164,7 @@ A few performance enhancements have been added:
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(Contributed by Mark Dickinson; :issue:`4258`.)
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Another set of changes made long objects a few bytes smaller: 2 bytes
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smaller on 32-bit systems and 6 bytes on 64-bit. (:
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smaller on 32-bit systems and 6 bytes on 64-bit.
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(Contributed by Mark Dickinson; :issue:`5260`.)
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* The division algorithm for long integers has been made faster
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@ -168,6 +174,10 @@ A few performance enhancements have been added:
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integer divisions and modulo operations.
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(Contributed by Mark Dickinson; :issue:`5512`.)
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* List comprehensions with an ``if`` condition are compiled into
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faster bytecode. (Patch by Antoine Pitrou, back-ported to 2.7
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by Jeffrey Yasskin; :issue:`4715`.)
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.. ======================================================================
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New, Improved, and Deprecated Modules
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@ -179,12 +189,6 @@ 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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* 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 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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(Contributed by Hagen Fuerstenau; :issue:`3860`.)
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@ -224,7 +228,24 @@ 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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*package_dir* and *data_files* to create the MANIFEST file.
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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 Ziade,
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with the initial contribution by Nathan Van Gheem; :issue:`4394`.)
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* New method: the :class:`Decimal` class gained a
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:meth:`from_float` class method that performs an exact conversion
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of a floating-point number to a :class:`Decimal`.
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Note that this is an **exact** conversion that strives for the
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closest decimal approximation to the floating-point representation's value;
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the resulting decimal value will therefore still include the inaccuracy,
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if any.
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For example, ``Decimal.from_float(0.1)`` returns
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``Decimal('0.1000000000000000055511151231257827021181583404541015625')``.
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(Implemented by Raymond Hettinger; :issue:`4796`.)
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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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@ -233,6 +254,9 @@ changes, or look through the Subversion logs for all the details.
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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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It's now possible to override the modification time
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recorded in a gzipped file by providing an optional timestamp to
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the constructor. (Contributed by Jacques Frechet; :issue:`4272`.)
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* The :class:`io.FileIO` class now raises an :exc:`OSError` when passed
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an invalid file descriptor. (Implemented by Benjamin Peterson;
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@ -263,6 +287,11 @@ changes, or look through the Subversion logs for all the details.
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floats or :class:`Decimal` instances. (Implemented by Raymond
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Hettinger; :issue:`5032`.)
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:func:`itertools.combinations` and :func:`itertools.product` were
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previously raising :exc:`ValueError` for values of *r* larger than
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the input iterable. This was deemed a specification error, so they
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now return an empty iterator. (Fixed by Raymond Hettinger; :issue:`4816`.)
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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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@ -351,6 +380,11 @@ Changes to Python's build process and to the C API include:
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is particularly useful for asynchronous IO operations.
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(Contributed by Kristjan Valur Jonsson; :issue:`4293`.)
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* The :program:`configure` script now checks for floating-point rounding bugs
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on certain 32-bit Intel chips and defines a :cmacro:`X87_DOUBLE_ROUNDING`
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preprocessor definition. No code currently uses this definition,
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but it's available if anyone wishes to use it.
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(Added by Mark Dickinson; :issue:`2937`.)
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.. ======================================================================
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@ -373,10 +407,22 @@ Port-Specific Changes: Windows
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Port-Specific Changes: Mac OS X
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-----------------------------------
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* The ``/Library/Python/2.7/site-packages`` is now appended to
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``sys.path``, in order to share added packages between the system
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installation and a user-installed copy of the same version.
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(Changed by Ronald Oussoren; :issue:`4865`.)
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Other Changes and Fixes
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=======================
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* When importing a module from a :file:`.pyc` or :file:`.pyo` file
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with an existing :file:`.py` counterpart, the :attr:`co_filename`
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attributes of all code objects if the original filename is obsolete,
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which can happen if the file has been renamed, moved, or is accessed
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through different paths. (Patch by Ziga Seilnacht and Jean-Paul
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Calderone; :issue:`1180193`.)
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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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