Merged revisions 68840,68881,68943,68945 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk ........ r68840 | andrew.kuchling | 2009-01-20 20:15:43 -0600 (Tue, 20 Jan 2009) | 1 line Add some items ........ r68881 | andrew.kuchling | 2009-01-23 21:28:18 -0600 (Fri, 23 Jan 2009) | 1 line Add various items ........ r68943 | tarek.ziade | 2009-01-25 16:09:10 -0600 (Sun, 25 Jan 2009) | 1 line Issue #5052: removed backward compatibility information (out of date) ........ r68945 | tarek.ziade | 2009-01-25 16:11:04 -0600 (Sun, 25 Jan 2009) | 1 line added missing module docstring ........
This commit is contained in:
Benjamin Peterson
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@ -6,6 +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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.. $Id$
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Rules for maintenance:
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@ -60,11 +62,6 @@ No release schedule has been decided yet for 2.7.
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.. ========================================================================
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Kristján Valur Jónsson, issue 4293
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Py_AddPendingCall is now thread safe. This allows any worker thread
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to submit notifications to the python main thread. This is particularly
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useful for asynchronous IO operations.
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Other Language Changes
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======================
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@ -95,7 +92,19 @@ Some smaller changes made to the core Python language are:
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Optimizations
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-------------
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To be written.
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A few performance enhancements have been added:
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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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pass is only performed when the middle generation has been collected
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10 times and when the number of survivor objects from the middle
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generation exceeds 10% of the number of objects in the oldest
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generation. The second condition was added to reduce the number
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of full garbage collections as the number of objects on the heap grows,
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avoiding quadratic performance when allocating very many objects.
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(Suggested by Martin von Loewis and implemented by Antoine Pitrou;
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:issue:`4074`.)
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.. ======================================================================
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@ -108,6 +117,62 @@ 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 not mandatory anymore 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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* 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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* A new :class:`Counter` class in the :mod:`collections` module is
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useful for tallying data. :class:`Counter` instances behave mostly
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like dictionaries but return zero for missing keys instead of
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raising a :exc:`KeyError`::
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>>> from collections import Counter
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>>> c=Counter()
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>>> for letter in 'here is a sample of english text':
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... c[letter] += 1
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...
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>>> c
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Counter({' ': 6, 'e': 5, 's': 3, 'a': 2, 'i': 2, 'h': 2,
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'l': 2, 't': 2, 'g': 1, 'f': 1, 'm': 1, 'o': 1, 'n': 1,
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'p': 1, 'r': 1, 'x': 1})
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>>> c['e']
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5
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>>> c['z']
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0
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There are two additional :class:`Counter` methods: :meth:`most_common`
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returns the N most common elements and their counts, and :meth:`elements`
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returns an iterator over the contained element, repeating each element
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as many times as its count::
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>>> c.most_common(5)
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[(' ', 6), ('e', 5), ('s', 3), ('a', 2), ('i', 2)]
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>>> c.elements() ->
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'a', 'a', ' ', ' ', ' ', ' ', ' ', ' ',
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'e', 'e', 'e', 'e', 'e', 'g', 'f', 'i', 'i',
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'h', 'h', 'm', 'l', 'l', 'o', 'n', 'p', 's',
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's', 's', 'r', 't', 't', 'x']
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Contributed by Raymond Hettinger; :issue:`1696199`.
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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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* 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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:issue:`4991`.)
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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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* A new function in the :mod:`subprocess` module,
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:func:`check_output`, runs a command with a specified set of arguments
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and returns the command's output as a string if the command runs without
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@ -125,11 +190,9 @@ changes, or look through the Subversion logs for all the details.
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(Contributed by Gregory P. Smith.)
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* It is not mandatory anymore 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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* 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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.. ======================================================================
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.. whole new modules get described in subsections here
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@ -145,7 +208,13 @@ Changes to Python's build process and to the C API include:
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* If you use the :file:`.gdbinit` file provided with Python,
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the "pyo" macro in the 2.7 version will now work when the thread being
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debugged doesn't hold the GIL; the macro will now acquire it before printing.
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(Contributed by haypo XXX; :issue:`3632`.)
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(Contributed by Victor Stinner; :issue:`3632`.)
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* :cfunc:`Py_AddPendingCall` is now thread safe, letting any
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worker thread submit notifications to the main Python thread. This
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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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.. ======================================================================
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@ -157,7 +226,11 @@ Port-Specific Changes: Windows
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:data:`CRT_ASSEMBLY_VERSION`,
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:data:`VC_ASSEMBLY_PUBLICKEYTOKEN`,
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and :data:`LIBRARIES_ASSEMBLY_NAME_PREFIX`.
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(Added by Martin von Loewis (XXX check); :issue:`4365`.)
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(Contributed by David Cournapeau; :issue:`4365`.)
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* The new :cfunc:`_beginthreadex` API is used to start threads, and
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the native thread-local storage functions are now used.
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(Contributed by Kristjan Valur Jonsson; :issue:`3582`.)
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.. ======================================================================
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@ -1,3 +1,8 @@
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"""distutils.command.install_lib
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Implements the Distutils 'install_lib' command
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(install all Python modules)."""
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__revision__ = "$Id$"
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import sys, os
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