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What's New in Python 2.6.3
==========================
*Release date: 02-Oct-2009*
What's New in Python 2.6.3rc1
=============================
*Release date: 29-Sep-2009*
Core and Builtins
-----------------
- Issue #5329: Fix os.popen* regression from 2.5 with commands as a
sequence running through the shell. Patch by Jean-Paul Calderone
and Jani Hakala.
- Issue #6990: Fix threading.local subclasses leaving old state around
after a reference cycle GC which could be recycled by new locals.
- Issue #6922: Fix an infinite loop when trying to decode an invalid
UTF-32 stream with a non-raising error handler like "replace" or "ignore".
- Issue #1590864: Fix potential deadlock when mixing threads and fork().
- Issue #6844: Do not emit DeprecationWarnings when accessing a "message"
attribute on exceptions that was set explicitly.
- Issue #6846: Fix bug where bytearray.pop() returns negative integers.
- Issue #6707: dir() on an uninitialized module caused a crash.
- Issue #6540: Fixed crash for bytearray.translate() with invalid parameters.
- Issue #6573: set.union() stopped processing inputs if an instance of self
occurred in the argument chain.
- Issue #6070: On posix platforms import no longer copies the execute bit
from the .py file to the .pyc file if it is set.
- Issue #4547: When debugging a very large function, it was not always
possible to update the lineno attribute of the current frame.
- Issue #4618: When unicode arguments are passed to print(), the default
separator and end should be unicode also.
- Issue #6119: Fixed a incorrect Py3k warning about order comparisons of
builtin functions and methods.
- Issue #5330: C functions called with keyword arguments were not reported by
the various profiling modules (profile, cProfile). Patch by Hagen Fürstenau.
- Issue #6089: str.format can raise SystemError with certain invalid
field specifiers.
- Issue #5994: the marshal module now has docstrings.
- Issue #5981: Fix two minor inf/nan issues in float.fromhex: (1) inf
and nan strings with trailing whitespace were incorrectly rejected
and (2) the interpretation of fromhex('-nan') didn't match that of
float('-nan').
- Issue #5890: in subclasses of 'property' the __doc__ attribute was
shadowed by classtype's, even if it was None. property now
inserts the __doc__ into the subclass instance __dict__.
- Issue #5724: (See also issue #4575.) Fix Py_IS_INFINITY macro to
work correctly on x87 FPUs: it now forces its argument to double
before testing for infinity.
- Issue #4971: Fix titlecase for characters that are their own
titlecase, but not their own uppercase.
- Issue #5829: complex('1e-500') no longer raises an exception
- Issue #5787: object.__getattribute__(some_type, "__bases__") segfaulted on
some builtin types.
- Issue #5283: Setting __class__ in __del__ caused a segfault.
- Issue #5759: float() didn't call __float__ on str subclasses.
- Issue #5108: Handle %s like %S and %R in PyUnicode_FromFormatV(): Call
PyUnicode_DecodeUTF8() once, remember the result and output it in a second
step. This avoids problems with counting UTF-8 bytes that ignores the effect
of using the replace error handler in PyUnicode_DecodeUTF8().
Library
-------
- Issue #6790: Make it possible again to pass an `array.array` to
`httplib.HTTPConnection.send`. Patch by Kirk McDonald.
- Issue #6236, #6348: Fix various failures in the `io` module under AIX
and other platforms, when using a non-gcc compiler. Patch by egreen.
- Issue #6851: Fix urllib.urlopen crash on secondairy threads on OSX 10.6
- Issue #6947: Fix distutils test on windows. Patch by Hirokazu Yamamoto.
- Issue #4606: Passing 'None' if ctypes argtype is set to POINTER(...)
does now always result in NULL.
- Issue #5042: ctypes Structure sub-subclass does now initialize
correctly with base class positional arguments.
- Issue #6938: Fix a TypeError in string formatting of a multiprocessing
debug message.
- Issue #6635: Fix profiler printing usage message.
- Issue #6795: int(Decimal('nan')) now raises ValueError instead of
returning NaN or raising InvalidContext. Also, fix infinite recursion
in long(Decimal('nan')).
- Issue #6850: Fix bug in Decimal._parse_format_specifier for formats
with no type specifier.
- Issue #4937: plat-mac/bundlebuilder revers to non-existing version.plist
- Issue #6838: Use a list to accumulate the value instead of
repeatedly concatenating strings in httplib's
HTTPResponse._read_chunked providing a significant speed increase
when downloading large files servend with a Transfer-Encoding of 'chunked'.
- Issue #6794: Fix Decimal.compare_total and Decimal.compare_total_mag: NaN
payloads are now ordered by integer value rather than lexicographically.
- Issue #6117: Fix O(n**2) performance degradation when outputting lots of
small data on a buffered socket.socket.makefile() object.
- Issue #6637: defaultdict.copy() did not work when the default factory
was left unspecified. Also, the eval/repr round-trip would fail when
the default_factory was None.
- Issue #1424152: Fix for httplib, urllib2 to support SSL while working through
proxy. Original patch by Christopher Li, changes made by Senthil Kumaran.
- Issues #5155, 5313, 5331: multiprocessing.Process._bootstrap was
unconditionally calling "os.close(sys.stdin.fileno())" resulting in file
descriptor errors
- Issue #6415: Fixed warnings.warn sagfault on bad formatted string.
- Issue #6344: Fixed a crash of mmap.read() when passed a negative argument.
- Issue #5230: pydoc would report no documentation found if a module generated
a 'not found' import error when loaded; it now reports the import errors.
Thanks to Lucas Prado Melo for initial fix and collaboration on the tests.
- Issue #6274: Fixed possible file descriptors leak in subprocess.py
- Issue #6271: mmap tried to close invalid file handle (-1) when annonymous.
(On Unix)
- Issue #6258: Support AMD64 in bdist_msi.
- Issue #5262: Fixed bug in next rollover time computation in
TimedRotatingFileHandler.
- Issue #6121: pydoc now ignores leading and trailing spaces in the
argument to the 'help' function.
- Issue #6050: Don't fail extracting a directory from a zipfile if
the directory already exists.
- collections.namedtuple() was not working with the following field
names: cls, self, tuple, itemgetter, and property.
- Issue #1309352: fcntl now converts its third arguments to a C `long` rather
than an int, which makes some operations possible under 64-bit Linux (e.g.
DN_MULTISHOT with F_NOTIFY).
- Issue #1983: Fix functions taking or returning a process identifier to use
the dedicated C type ``pid_t`` instead of a C ``int``. Some platforms have
a process identifier type wider than the standard C integer type.
- Issue #4066: smtplib.SMTP_SSL._get_socket now correctly returns the socket.
Patch by Farhan Ahmad, test by Marcin Bachry.
- Issue #1655: Make imaplib IPv6-capable. Patch by Derek Morr.
- Issue #1664: Make nntplib IPv6-capable. Patch by Derek Morr.
- Issue #5971: StreamHandler.handleError now swallows IOErrors which occur when
trying to print a traceback.
- Issue 5955: aifc's close method did not close the file it wrapped,
now it does. This also means getfp method now returns the real fp.
- Issue #4875: On win32, ctypes.util.find_library does no longer
return directories.
- Issue #5692: In :class:`zipfile.Zipfile`, fix wrong path calculation when
extracting a file to the root directory.
- Issue #2245: aifc now skips chunk types it doesn't recognize, per spec.
- Issue #4305: ctypes should now build again on mipsel-linux-gnu
- Issue #5853: calling a function of the mimetypes module from several threads
at once could hit the recursion limit if the mimetypes database hadn't been
initialized before.
- Issue #5041: ctypes does now allow pickling wide character.
- Issue #5768: Fixed bug in Unicode output logic and test case for same.
- Issue #1161031: fix readwrite select flag handling: POLLPRI now
results in a handle_expt_event call, not handle_read_event, and POLLERR
and POLLNVAL now call handle_close, not handle_expt_event. Also,
dispatcher now has an 'ignore_log_types' attribute for suppressing
log messages, which is set to 'warning' by default.
- Issue #5828 (Invalid behavior of unicode.lower): Fixed bogus logic in
makeunicodedata.py and regenerated the Unicode database (This fixes
u'\u1d79'.lower() == '\x00').
- Issue #1202: zipfile module would cause a DeprecationWarning when storing
files with a CRC32 > 2**31-1.
- Issue #6163: Fixed HP-UX runtime library dir options in
distutils.unixcompiler. Initial patch by Sridhar Ratnakumar and
Michael Haubenwallner.
- Issue #4660: If a multiprocessing.JoinableQueue.put() was preempted, it was
possible to get a spurious 'task_done() called too many times' error.
- Issue #6595: The Decimal constructor now allows arbitrary Unicode
decimal digits in input, as recommended by the standard. Previously
it was restricted to accepting [0-9].
- Issue #6553: Fixed a crash in cPickle.load(), when given a file-like object
containing incomplete data.
- Issue #2622: Fixed an ImportError when importing email.messsage from a
standalone application built with py2exe or py2app.
- Issue #6455: Fixed test_build_ext under win32.
- Issue #6403: Fixed package path usage in build_ext.
- Issue #6287: Added the license field in Distutils documentation.
- Issue #6263: Fixed syntax error in distutils.cygwincompiler.
- Issue #5201: distutils.sysconfig.parse_makefile() now understands `$$`
in Makefiles. This prevents compile errors when using syntax like:
`LDFLAGS='-rpath=\$$LIB:/some/other/path'`. Patch by Floris Bruynooghe.
- Issue #6062: In distutils, fixed the package option of build_ext. Feedback
and tests on pywin32 by Tim Golden.
- Issue #1309567: Fix linecache behavior of stripping subdirectories when
looking for files given by a relative filename.
- Issue #6046: Fixed the library extension when distutils build_ext is used
inplace. Initial patch by Roumen Petrov.
- Issue #6022: a test file was created in the current working directory by
test_get_outputs in Distutils.
- Issue #5977: distutils build_ext.get_outputs was not taking into account the
inplace option. Initial patch by kxroberto.
- Issue #5984: distutils.command.build_ext.check_extensions_list checks were
broken for old-style extensions.
- Issue #5854: Updated __all__ to include some missing names and remove some
names which should not be exported.
- Issue #5810: Fixed Distutils test_build_scripts so it uses
sysconfig.get_config_vars.
- Issue #6865: Fix reference counting issue in the initialization of the pwd
module.
Extension Modules
-----------------
- Issue #6944: Fix a SystemError when socket.getnameinfo() was called
with something other than a tuple as first argument.
- Issue #6848: Fix curses module build failure on OS X 10.6.
- Fix expat to not segfault with specially crafted input.
- Issue #4873: Fix resource leaks in error cases of pwd and grp.
Build
-----
- Issue #6980: Fix ctypes build failure on armel-linux-gnueabi with
-mfloat-abi=softfp.
- Issue #6802: Fix build issues on MacOSX 10.6
- Issue 5390: Add uninstall icon independent of whether file
extensions are installed.
- Issue #6094: Build correctly with Subversion 1.7.
- Issue #5726: Make Modules/ld_so_aix return the actual exit code of the
linker, rather than always exit successfully. Patch by Floris Bruynooghe.
- Issue 5809: Specifying both --enable-framework and --enable-shared is
an error. Configure now explicity tells you about this.
Documentation
-------------
- Issue #6556: Fixed the Distutils configuration files location explanation
for Windows.
- Issue #6801 : symmetric_difference_update also accepts |.
Thanks to Carl Chenet.
Tests
-----
- Issue #5837: Certain sequences of calls to set() and unset() for
support.EnvironmentVarGuard objects restored the environment variables
incorrectly on __exit__.
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Compiles, installs, and runs on NetBSD-5.99.10/amd64; no further
tests done. Please test and fix on your platform!
What's new in Python-2.6:
The major theme of Python 2.6 is preparing the migration path to
Python 3.0, a major redesign of the language. Whenever possible,
Python 2.6 incorporates new features and syntax from 3.0 while
remaining compatible with existing code by not removing older
features or syntax. When it tries to do what it can, adding
compatibility functions in a future_builtins module and a -3 switch
to warn about usages that will become unsupported in 3.0.
Some significant new packages have been added to the standard
library, such as the multiprocessing and json modules, but there
aren way.
Python 2.6 also sees a number of improvements and bugfixes throughout
the source. A search through the change logs finds there were 259
patches applied and 612 bugs fixed between Python 2.5 and 2.6. Both
figures are likely to be underestimates.
More details at
http://docs.python.org/whatsnew/2.6.html
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