[Python-checkins] r77115 - python/trunk/Doc/whatsnew/2.7.rst
andrew.kuchling
python-checkins at python.org
Tue Dec 29 21:10:16 CET 2009
Author: andrew.kuchling
Date: Tue Dec 29 21:10:16 2009
New Revision: 77115
Log:
Various additions
Modified:
python/trunk/Doc/whatsnew/2.7.rst
Modified: python/trunk/Doc/whatsnew/2.7.rst
==============================================================================
--- python/trunk/Doc/whatsnew/2.7.rst (original)
+++ python/trunk/Doc/whatsnew/2.7.rst Tue Dec 29 21:10:16 2009
@@ -49,9 +49,9 @@
This saves the maintainer some effort going through the SVN logs
when researching a change.
-This article explains the new features in Python 2.7. No release
-schedule has been decided yet for 2.7; the schedule will eventually be
-described in :pep:`373`.
+This article explains the new features in Python 2.7. The final
+release of 2.7 is currently scheduled for June 2010; the detailed
+schedule is described in :pep:`373`.
.. Compare with previous release in 2 - 3 sentences here.
add hyperlink when the documentation becomes available online.
@@ -301,6 +301,9 @@
(Implemented by Mark Dickinson; :issue:`3166`.)
+ Integer division is also more accurate in its rounding behaviours. (Also
+ implemented by Mark Dickinson; :issue:`1811`.)
+
* The :class:`bytearray` type's :meth:`translate` method now accepts
``None`` as its first argument. (Fixed by Georg Brandl;
:issue:`4759`.)
@@ -315,6 +318,11 @@
supported. (Contributed by Alexander Belchenko and Amaury Forgeot
d'Arc; :issue:`1616979`.)
+* Extra parentheses in function definitions are illegal in Python 3.x,
+ meaning that you get a syntax error from ``def f((x)): pass``. In
+ Python3-warning mode, Python 2.7 will now warn about this odd usage.
+ (Noted by James Lingard; :issue:`7362`.)
+
.. ======================================================================
@@ -333,16 +341,16 @@
:keyword:`with` statements, looking up the :meth:`__enter__` and
:meth:`__exit__` methods. (Contributed by Benjamin Peterson.)
-* The garbage collector now performs better when many objects are
- being allocated without deallocating any. A full garbage collection
- pass is only performed when the middle generation has been collected
- 10 times and when the number of survivor objects from the middle
- generation exceeds 10% of the number of objects in the oldest
- generation. The second condition was added to reduce the number
- of full garbage collections as the number of objects on the heap grows,
- avoiding quadratic performance when allocating very many objects.
- (Suggested by Martin von Loewis and implemented by Antoine Pitrou;
- :issue:`4074`.)
+* The garbage collector now performs better for one common usage
+ pattern: when many objects are being allocated without deallocating
+ any of them. This would previously take quadratic
+ time for garbage collection, but now the number of full garbage collections
+ is reduced as the number of objects on the heap grows.
+ The new logic is to only perform a full garbage collection pass when
+ the middle generation has been collected 10 times and when the
+ number of survivor objects from the middle generation exceeds 10% of
+ the number of objects in the oldest generation. (Suggested by Martin
+ von Loewis and implemented by Antoine Pitrou; :issue:`4074`.)
* The garbage collector tries to avoid tracking simple containers
which can't be part of a cycle. In Python 2.7, this is now true for
@@ -410,7 +418,6 @@
conversion function that supports arbitrary bases.
(Patch by Gawain Bolton; :issue:`6713`.)
-
.. ======================================================================
New and Improved Modules
@@ -488,7 +495,9 @@
(Added by Raymond Hettinger; :issue:`1818`.)
The :class:`deque` data type now exposes its maximum length as the
- read-only :attr:`maxlen` attribute. (Added by Raymond Hettinger.)
+ read-only :attr:`maxlen` attribute, and has a
+ :meth:`reverse` method that reverses the elements of the deque in-place.
+ (Added by Raymond Hettinger.)
* The :mod:`ctypes` module now always converts ``None`` to a C NULL
pointer for arguments declared as pointers. (Changed by Thomas
@@ -539,14 +548,24 @@
process, but instead simply not install the failing extension.
(Contributed by Georg Brandl; :issue:`5583`.)
- Issue #7457: added a read_pkg_file method to.distutils.dist.DistributionMetadata
- see file:///MacDev/svn.python.org/python-trunk/Doc/build/html/distutils/examples.html#reading-the-metadata
- (:issue:`7457`, added by Tarek).
+ The :class:`distutils.dist.DistributionMetadata` class'
+ :meth:`read_pkg_file` method will read the contents of a package's
+ metadata file. For an example of its use,
+ XXX link to file:///MacDev/svn.python.org/python-trunk/Doc/build/html/distutils/examples.html#reading-the-metadata
+ (Contributed by Tarek Ziade; :issue:`7457`.)
* The :class:`Fraction` class now accepts two rational numbers
as arguments to its constructor.
(Implemented by Mark Dickinson; :issue:`5812`.)
+* The :mod:`ftplib` module gained the ability to establish secure FTP
+ connections using TLS encapsulation of authentication as well as
+ subsequent control and data transfers. This is provided by the new
+ :class:`ftplib.FTP_TLS` class.
+ (Contributed by Giampaolo Rodola', :issue:`2054`.) The :meth:`storbinary`
+ method for binary uploads can now restart uploads thanks to an added
+ *rest* parameter (patch by Pablo Mouzo; :issue:`6845`.)
+
* New function: the :mod:`gc` module's :func:`is_tracked` returns
true if a given instance is tracked by the garbage collector, false
otherwise. (Contributed by Antoine Pitrou; :issue:`4688`.)
@@ -627,8 +646,12 @@
with any object literal that decodes to a list of pairs.
(Contributed by Raymond Hettinger; :issue:`5381`.)
-* New functions: the :mod:`math` module now has
- a :func:`gamma` function.
+* New functions: the :mod:`math` module gained
+ :func:`erf` and :func:`erfc` for the error function and the complementary error function,
+ :func:`expm1` which computes ``e**x - 1`` with more precision than
+ using :func:`exp` and subtracting 1,
+ :func:`gamma` for the Gamma function, and
+ :func:`lgamma` for the natural log of the Gamma function.
(Contributed by Mark Dickinson and nirinA raseliarison; :issue:`3366`.)
* The :mod:`multiprocessing` module's :class:`Manager*` classes
@@ -640,6 +663,13 @@
* The :mod:`nntplib` module now supports IPv6 addresses.
(Contributed by Derek Morr; :issue:`1664`.)
+* New functions: the :mod:`os` module wraps the following POSIX system
+ calls: :func:`getresgid` and :func:`getresuid`, which return the
+ real, effective, and saved GIDs and UIDs;
+ :func:`setresgid` and :func:`setresuid`, which set
+ real, effective, and saved GIDs and UIDs to new values. (Contributed
+ by Travis H.; :issue:`6508`.)
+
* The :mod:`pydoc` module now has help for the various symbols that Python
uses. You can now do ``help('<<')`` or ``help('@')``, for example.
(Contributed by David Laban; :issue:`4739`.)
@@ -728,12 +758,6 @@
:mod:`zipfile` now supports archiving empty directories and
extracts them correctly. (Fixed by Kuba Wieczorek; :issue:`4710`.)
-* The :mod:`ftplib` module gains the ability to establish secure FTP
- connections using TLS encapsulation of authentication as well as
- subsequent control and data transfers. This is provided by the new
- :class:`ftplib.FTP_TLS` class.
- (Contributed by Giampaolo Rodola', :issue:`2054`.)
-
.. ======================================================================
.. whole new modules get described in subsections here
@@ -934,6 +958,12 @@
extensions needed to call :cfunc:`PyCode_New`, which had many
more arguments. (Added by Jeffrey Yasskin.)
+* New function: :cfunc:`PyErr_NewExceptionWithDoc` creates a new
+ exception class, just as the existing :cfunc:`PyErr_NewException` does,
+ but takes an extra ``char *`` argument containing the docstring for the
+ new exception class. (Added by the 'lekma' user on the Python bug tracker;
+ :issue:`7033`.)
+
* New function: :cfunc:`PyFrame_GetLineNumber` takes a frame object
and returns the line number that the frame is currently executing.
Previously code would need to get the index of the bytecode
@@ -992,6 +1022,12 @@
* The build process now supports Subversion 1.7. (Contributed by
Arfrever Frehtes Taifersar Arahesis; :issue:`6094`.)
+* Compiling Python with the :option:`--with-valgrind` option will now
+ disable the pymalloc allocator, which is difficult for the Valgrind to
+ analyze correctly. Valgrind will therefore be better at detecting
+ memory leaks and overruns. (Contributed by James Henstridge; :issue:`2422`.)
+
+
.. ======================================================================
Port-Specific Changes: Windows
@@ -1070,6 +1106,10 @@
affects new-style classes (derived from :class:`object`) and C extension
types. (:issue:`6101`.)
+* The :meth:`readline` method of :class:`StringIO` objects now does
+ nothing when a negative length is requested, as other file-like
+ objects do. (:issue:`7348`).
+
.. ======================================================================
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