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NEWS
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+++++++++++
Python News
+++++++++++
What's New in Python 3.3.0 Beta 2?
==================================
*Release date: xx-xxx-2012*
Core and Builtins
-----------------
- Issue #15568: Fix the return value of "yield from" when StopIteration is
raised by a custom iterator.
- Issue #13119: sys.stdout and sys.stderr are now using "\r\n" newline on
Windows, as Python 2.
- Issue #15534: Fix the fast-search function for non-ASCII Unicode strings.
- Issue #15508: Fix the docstring for __import__ to have the proper default
value of 0 for 'level' and to not mention negative levels since they are
not supported.
- Issue #15425: Eliminated traceback noise from more situations involving
importlib
- Issue #14578: Support modules registered in the Windows registry again.
- Issue #15466: Stop using TYPE_INT64 in marshal, to make importlib.h
(and other byte code files) equal between 32-bit and 64-bit systems.
- Issue #1692335: Move initial args assignment to
BaseException.__new__ to help pickling of naive subclasses.
- Issue #12834: Fix PyBuffer_ToContiguous() for non-contiguous arrays.
- Issue #15456: Fix code __sizeof__ after #12399 change.
Patch by Serhiy Storchaka.
- Issue #15404: Refleak in PyMethodObject repr.
- Issue #15394: An issue in PyModule_Create that caused references to
be leaked on some error paths has been fixed. Patch by Julia Lawall.
- Issue #15368: An issue that caused bytecode generation to be
non-deterministic has been fixed.
- Issue #15202: Consistently use the name "follow_symlinks" for
new parameters in os and shutil functions.
- Issue #15314: __main__.__loader__ is now set correctly during
interpreter startup
- Issue #15111: When a module imported using 'from import' has an ImportError
inside itself, don't mask that fact behind a generic ImportError for the
module itself.
- Issue #15293: Add GC support to the AST base node type.
- Issue #15291: Fix a memory leak where AST nodes where not properly
deallocated.
- Issue #15110: Fix the tracebacks generated by "import xxx" to not show
the importlib stack frames.
- Issue #15020: The program name used to search for Python's path is now
"python3" under Unix, not "python".
- Issue #15033: Fix the exit status bug when modules invoked using -m swith,
return the proper failure return value (1). Patch contributed by Jeff Knupp.
- Issue #15229: An OSError subclass whose __init__ doesn't call back
OSError.__init__ could produce incomplete instances, leading to crashes
when calling str() on them.
- Issue 15307: Virtual environments now use symlinks with framework builds
on Mac OS X, like other POSIX builds.
Library
-------
- Issue #15576: Allow extension modules to act as a package's __init__ module.
- Issue #15502: Have importlib.invalidate_caches() work on sys.meta_path
instead of sys.path_importer_cache.
- Issue #15163: Pydoc shouldn't list __loader__ as module data.
- Issue #15471: Do not use mutable objects as defaults for
importlib.__import__().
- Issue #15559: To avoid a problematic failure mode when passed to the bytes
constructor, objects in the ipaddress module no longer implement __index__
(they still implement __int__ as appropriate)
- Issue #15546: Fix handling of pathological input data in the peek() and
read1() methods of the BZ2File, GzipFile and LZMAFile classes.
- Issue #13052: Fix IDLE crashing when replace string in Search/Replace dialog
ended with '\'. Patch by Roger Serwy.
- Issue #12655: Instead of requiring a custom type, os.sched_getaffinity and
os.sched_setaffinity now use regular sets of integers to represent the CPUs
a process is restricted to.
- Issue #15538: Fix compilation of the getnameinfo() / getaddrinfo()
emulation code. Patch by Philipp Hagemeister.
- Issue #15519: Properly expose WindowsRegistryFinder in importlib (and use
the correct term for it). Original patch by Eric Snow.
- Issue #15502: Bring the importlib ABCs into line with the current state
of the import protocols given PEP 420. Original patch by Eric Snow.
- Issue #15499: Launching a webbrowser in Unix used to sleep for a few
seconds. Original patch by Anton Barkovsky.
- Issue #15463: the faulthandler module truncates strings to 500 characters,
instead of 100, to be able to display long file paths
- Issue #6056: Make multiprocessing use setblocking(True) on the
sockets it uses. Original patch by J Derek Wilson.
- Issue #15364: Fix sysconfig.get_config_var('srcdir') to be an
absolute path.
- Issue #15041: update "see also" list in tkinter documentation.
- Issue #15413: os.times() had disappeared under Windows.
- Issue #15402: An issue in the struct module that caused sys.getsizeof to
return incorrect results for struct.Struct instances has been fixed.
Initial patch by Serhiy Storchaka.
- Issue #15232: when mangle_from is True, email.Generator now correctly mangles
lines that start with 'From ' that occur in a MIME preamble or epilogue.
- Issue #15094: Incorrectly placed #endif in _tkinter.c.
Patch by Serhiy Storchaka.
- Issue #13922: argparse no longer incorrectly strips '--'s that appear
after the first one.
- Issue #12353: argparse now correctly handles null argument values.
- Issues #10017 and #14998: Fix TypeError using pprint on dictionaries with
user-defined types as keys or other unorderable keys.
- Issue #15397: inspect.getmodulename() is now based directly on importlib
via a new importlib.machinery.all_suffixes() API.
- Issue #14635: telnetlib will use poll() rather than select() when possible
to avoid failing due to the select() file descriptor limit.
- Issue #15180: Clarify posixpath.join() error message when mixing str & bytes
- Issue #15343: pkgutil now includes an iter_importer_modules implementation
for importlib.machinery.FileFinder (similar to the way it already handled
zipimport.zipimporter)
- Issue #15314: runpy now sets __main__.__loader__ correctly
- Issue #15357: The import emulation in pkgutil is now deprecated. pkgutil
uses importlib internally rather than the emulation
- Issue #15233: Python now guarantees that callables registered with
the atexit module will be called in a deterministic order.
- Issue #15238: shutil.copystat now copies Linux "extended attributes".
- Issue #15230: runpy.run_path now correctly sets __package__ as described
in the documentation
- Issue #15315: Support VS 2010 in distutils cygwincompiler.
- Issue #15294: Fix a regression in pkgutil.extend_path()'s handling of
nested namespace packages.
- Issue #15056: imp.cache_from_source() and source_from_cache() raise
NotImplementedError when sys.implementation.cache_tag is set to None.
- Issue #15256: Grammatical mistake in exception raised by imp.find_module().
- Issue #5931: wsgiref environ variable SERVER_SOFTWARE will specify an
implementation specific term like Cpython, Jython instead of generic "Python"
- Issue #13248: Remove obsolete argument "max_buffer_size" of BufferedWriter
and BufferedRWPair, from the io module.
- Issue #13248: Remove obsolete argument "version" of argparse.ArgumentParser.
- Issue #14814: implement more consistent ordering and sorting behaviour
for ipaddress objects
- Issue #14814: ipaddress network objects correctly return NotImplemented
when compared to arbitrary objects instead of raising TypeError
- Issue #14990: Correctly fail with SyntaxError on invalid encoding
declaration.
- Issue #14814: ipaddress now provides more informative error messages when
constructing instances directly (changes permitted during beta due to
provisional API status)
- Issue #15247: FileIO now raises an error when given a file descriptor
pointing to a directory.
- Issue #15261: Stop os.stat(fd) crashing on Windows when fd not open.
- Issue #15166: Implement imp.get_tag() using sys.implementation.cache_tag.
- Issue #15210: Catch KeyError when imprortlib.__init__ can't find
_frozen_importlib in sys.modules, not ImportError.
- Issue #15030: importlib.abc.PyPycLoader now supports the new source size
header field in .pyc files.
- Issue #5346: Preserve permissions of mbox, MMDF and Babyl mailbox
files on flush().
- Issue #10571: Fix the "--sign" option of distutils' upload command.
Patch by Jakub Wilk.
- Issue #9559: If messages were only added, a new file is no longer
created and renamed over the old file when flush() is called on an
mbox, MMDF or Babyl mailbox.
- Issue 10924: Fixed mksalt() to use a RNG that is suitable for cryptographic
purpose.
- Issue #15184: Ensure consistent results of OS X configuration
tailoring for universal builds by factoring out common OS X-specific
customizations from sysconfig, distutils.sysconfig, distutils.util,
and distutils.unixccompiler into a new module _osx_support.
C API
-----
- Issues #15169, #14599: Strip out the C implementation of
imp.source_from_cache() used by PyImport_ExecCodeModuleWithPathnames() and
used the Python code instead. Leads to PyImport_ExecCodeModuleObject() to not
try to infer the source path from the bytecode path as
PyImport_ExecCodeModuleWithPathnames() does.
Extension Modules
-----------------
- Issue #6493: An issue in ctypes on Windows that caused structure bitfields
of type ctypes.c_uint32 and width 32 to incorrectly be set has been fixed.
- Issue #15194: Update libffi to the 3.0.11 release.
Tools/Demos
-----------
- Issue #15458: python-config gets a new option --configdir to print the
$LIBPL value.
- Move importlib.test.benchmark to Tools/importbench.
- Issue #12605: The gdb hooks for debugging CPython (within Tools/gdb) have
been enhanced to show information on more C frames relevant to CPython within
the "py-bt" and "py-bt-full" commands:
* C frames that are waiting on the GIL
* C frames that are garbage-collecting
* C frames that are due to the invocation of a PyCFunction
Documentation
-------------
- Issue #15295: Reorganize and rewrite the documentation on the import system.
- Issue #15230: Clearly document some of the limitations of the runpy
module and nudge readers towards importlib when appropriate.
- Issue #15053: Copy Python 3.3 import lock change notice to all relevant
functions in imp instead of just at the top of the relevant section.
- Issue #15288: Link to the term "loader" in notes in pkgutil about how things
won't work as expected in Python 3.3 and mark the requisite functions as
"changed" since they will no longer work with modules directly imported by
import itself.
- Issue #13557: Clarify effect of giving two different namespaces to exec or
execfile().
- Issue #15250: Document that filecmp.dircmp compares files shallowly. Patch
contributed by Chris Jerdonek.
Tests
-----
- Issue #15467: Move helpers for __sizeof__ tests into test_support.
Patch by Serhiy Storchaka.
- Issue #15320: Make iterating the list of tests thread-safe when running
tests in multiprocess mode. Patch by Chris Jerdonek.
- Issue #15168: Move importlib.test to test.test_importlib.
- Issue #15091: Reactivate a test on UNIX which was failing thanks to a
forgotten importlib.invalidate_caches() call.
- Issue #15230: Adopted a more systematic approach in the runpy tests.
- Issue #15300: Ensure the temporary test working directories are in the same
parent folder when running tests in multiprocess mode from a Python build.
Patch by Chris Jerdonek.
- Issue #15284: Skip {send,recv}msg tests in test_socket when IPv6 is not
enabled. Patch by Brian Brazil.
- Issue #15277: Fix a resource leak in support.py when IPv6 is disabled.
Patch by Brian Brazil.
Build
-----
- Issue #11715: Fix multiarch detection without having Debian development
tools (dpkg-dev) installed.
- Issue #15037: Build OS X installers with local copy of ncurses 5.9 libraries
to avoid curses.unget_wch bug present in older versions of ncurses such as
those shipped with OS X.
- Issue #15560: Fix building _sqlite3 extension on OS X with an SDK.
Also, for OS X installers, ensure consistent sqlite3 behavior and feature
availability by building a local copy of libsqlite3 rather than
depending on the wide range of versions supplied with various OS X releases.
- Issue #8847: Disable COMDAT folding in Windows PGO builds.
- Issue #14018: Fix OS X Tcl/Tk framework checking when using OS X SDKs.
- Issue #15431: Add _freeze_importlib project to regenerate importlib.h
on Windows. Patch by Kristján Valur Jónsson.
- Issue #14197: For OS X framework builds, ensure links to the shared
library are created with the proper ABI suffix.
- Issue #14330: For cross builds, don't use host python, use host search paths
for host compiler.
- Issue #15235: Allow Berkley DB versions up to 5.3 to build the dbm module.
- Issue #15268: Search curses.h in /usr/include/ncursesw.
What's New in Python 3.3.0 Beta 1?
==================================
*Release date: 27-Jun-2012*
Core and Builtins
-----------------
- Fix a (most likely) very rare memory leak when calling main() and not being
able to decode a command-line argument.
- Issue #14815: Use Py_ssize_t instead of long for the object hash, to
preserve all 64 bits of hash on Win64.
- Issue #12268: File readline, readlines and read() or readall() methods
no longer lose data when an underlying read system call is interrupted.
IOError is no longer raised due to a read system call returning EINTR
from within these methods.
- Issue #11626: Add _SizeT functions to stable ABI.
- Issue #15146: Add PyType_FromSpecWithBases. Patch by Robin Schreiber.
- Issue #15142: Fix reference leak when deallocating instances of types
created using PyType_FromSpec().
- Issue #15042: Add PyState_AddModule and PyState_RemoveModule. Add version
guard for Py_LIMITED_API additions. Patch by Robin Schreiber.
- Issue #10053: Don't close FDs when FileIO.__init__ fails. Loosely based on
the work by Hirokazu Yamamoto.
- Issue #15096: Removed support for ur'' as the raw notation isn't
compatible with Python 2.x's raw unicode strings.
- Issue #13783: Generator objects now use the identifier APIs internally
- Issue #14874: Restore charmap decoding speed to pre-PEP 393 levels.
Patch by Serhiy Storchaka.
- Issue #15026: utf-16 encoding is now significantly faster (up to 10x).
Patch by Serhiy Storchaka.
- Issue #11022: open() and io.TextIOWrapper are now calling
locale.getpreferredencoding(False) instead of locale.getpreferredencoding()
in text mode if the encoding is not specified. Don't change temporary the
locale encoding using locale.setlocale(), use the current locale encoding
instead of the user preferred encoding.
- Issue #14673: Add Eric Snow's sys.implementation implementation.
- Issue #15038: Optimize python Locks on Windows.
Library
-------
- Issue #9803: Don't close IDLE on saving if breakpoint is open.
Patch by Roger Serwy.
- Issue #12288: Consider '0' and '0.0' as valid initialvalue
for tkinter SimpleDialog.
- Issue #15512: Add a __sizeof__ implementation for parser.
Patch by Serhiy Storchaka.
- Issue #15469: Add a __sizeof__ implementation for deque objects.
Patch by Serhiy Storchaka.
- Issue #15489: Add a __sizeof__ implementation for BytesIO objects.
Patch by Serhiy Storchaka.
- Issue #15487: Add a __sizeof__ implementation for buffered I/O objects.
Patch by Serhiy Storchaka.
- Issue #15514: Correct __sizeof__ support for cpu_set.
Patch by Serhiy Storchaka.
- Issue #15187: Bugfix: remove temporary directories test_shutil was leaving
behind.
- Issue #15177: Added dir_fd parameter to os.fwalk().
- Issue #15176: Clarified behavior, documentation, and implementation
of os.listdir().
- Issue #15061: Re-implemented hmac.compare_digest() in C to prevent further
timing analysis and to support all buffer protocol aware objects as well as
ASCII only str instances safely.
- Issue #15164: Change return value of platform.uname() from a
plain tuple to a collections.namedtuple.
- Support Mageia Linux in the platform module.
- Issue #11678: Support Arch linux in the platform module.
- Issue #15118: Change return value of os.uname() and os.times() from
plain tuples to immutable iterable objects with named attributes
(structseq objects).
- Speed up _decimal by another 10-15% by caching the thread local context
that was last accessed. In the pi benchmark (64-bit platform, prec=9),
_decimal is now only 1.5x slower than float.
- Remove the packaging module, which is not ready for prime time.
- Issue #15154: Add "dir_fd" parameter to os.rmdir, remove "rmdir"
parameter from os.remove / os.unlink.
- Issue #4489: Add a shutil.rmtree that isn't susceptible to symlink attacks.
It is used automatically on platforms supporting the necessary os.openat()
and os.unlinkat() functions. Main code by Martin von Löwis.
- Issue #15156: HTMLParser now uses the new "html.entities.html5" dictionary.
- Issue #11113: add a new "html5" dictionary containing the named character
references defined by the HTML5 standard and the equivalent Unicode
character(s) to the html.entities module.
- Issue #15114: the strict mode of HTMLParser and the HTMLParseError exception
are deprecated now that the parser is able to parse invalid markup.
- Issue #3665: \u and \U escapes are now supported in unicode regular
expressions. Patch by Serhiy Storchaka.
- Issue #15153: Added inspect.getgeneratorlocals to simplify white box
testing of generator state updates
- Issue #13062: Added inspect.getclosurevars to simplify testing stateful
closures
- Issue #11024: Fixes and additional tests for Time2Internaldate.
- Issue #14626: Large refactoring of functions / parameters in the os module.
Many functions now support "dir_fd" and "follow_symlinks" parameters;
some also support accepting an open file descriptor in place of of a path
string. Added os.support_* collections as LBYL helpers. Removed many
functions only previously seen in 3.3 alpha releases (often starting with
"f" or "l", or ending with "at"). Originally suggested by Serhiy Storchaka;
implemented by Larry Hastings.
- Issue #15008: Implement PEP 362 "Signature Objects".
Patch by Yury Selivanov.
- Issue: #15138: base64.urlsafe_{en,de}code() are now 3-4x faster.
- Issue #444582: Add shutil.which, for finding programs on the system path.
Original patch by Erik Demaine, with later iterations by Jan Killian
and Brian Curtin.
- Issue #14837: SSL errors now have ``library`` and ``reason`` attributes
describing precisely what happened and in which OpenSSL submodule. The
str() of a SSLError is also enhanced accordingly.
- Issue #9527: datetime.astimezone() method will now supply a class
timezone instance corresponding to the system local timezone when
called with no arguments.
- Issue #14653: email.utils.mktime_tz() no longer relies on system
mktime() when timezone offest is supplied.
- Issue #14684: zlib.compressobj() and zlib.decompressobj() now support the use
of predefined compression dictionaries. Original patch by Sam Rushing.
- Fix GzipFile's handling of filenames given as bytes objects.
- Issue #14772: Return destination values from some shutil functions.
- Issue #15064: Implement context manager protocol for multiprocessing types
- Issue #15101: Make pool finalizer avoid joining current thread.
- Issue #14657: The frozen instance of importlib used for bootstrap is now
also the module imported as importlib._bootstrap.
- Issue #14055: Add __sizeof__ support to _elementtree.
- Issue #15054: A bug in tokenize.tokenize that caused string literals
with 'b' prefixes to be incorrectly tokenized has been fixed.
Patch by Serhiy Storchaka.
- Issue #15006: Allow equality comparison between naive and aware
time or datetime objects.
- Issue #14982: Document that pkgutil's iteration functions require the
non-standard iter_modules() method to be defined by an importer (something
the importlib importers do not define).
- Issue #15036: Mailbox no longer throws an error if a flush is done
between operations when removing or changing multiple items in mbox,
MMDF, or Babyl mailboxes.
- Issue #14059: Implement multiprocessing.Barrier.
- Issue #15061: The inappropriately named hmac.secure_compare has been
renamed to hmac.compare_digest, restricted to operating on bytes inputs
only and had its documentation updated to more accurately reflect both its
intent and its limitations
- Issue #13841: Make child processes exit using sys.exit() on Windows.
- Issue #14936: curses_panel was converted to PEP 3121 and PEP 384 API.
Patch by Robin Schreiber.
- Issue #1667546: On platforms supporting tm_zone and tm_gmtoff fields
in struct tm, time.struct_time objects returned by time.gmtime(),
time.localtime() and time.strptime() functions now have tm_zone and
tm_gmtoff attributes. Original patch by Paul Boddie.
- Rename adjusted attribute to adjustable in time.get_clock_info() result.
- Issue #3518: Remove references to non-existent BaseManager.from_address()
method.
- Issue #13857: Added textwrap.indent() function (initial patch by Ezra
Berch)
- Issue #2736: Added datetime.timestamp() method.
- Issue #13854: Make multiprocessing properly handle non-integer
non-string argument to SystemExit.
- Issue #12157: Make pool.map() empty iterables correctly. Initial
patch by mouad.
- Issue #11823: disassembly now shows argument counts on calls with keyword args.
- Issue #14711: os.stat_float_times() has been deprecated.
- LZMAFile now accepts the modes "rb"/"wb"/"ab" as synonyms of "r"/"w"/"a".
- The bz2 and lzma modules now each contain an open() function, allowing
compressed files to readily be opened in text mode as well as binary mode.
- BZ2File.__init__() and LZMAFile.__init__() now accept a file object as their
first argument, rather than requiring a separate "fileobj" argument.
- gzip.open() now accepts file objects as well as filenames.
- Issue #14992: os.makedirs(path, exist_ok=True) would raise an OSError
when the path existed and had the S_ISGID mode bit set when it was
not explicitly asked for. This is no longer an exception as mkdir
cannot control if the OS sets that bit for it or not.
- Issue #14989: Make the CGI enable option to http.server available via command
line.
- Issue #14987: Add a missing import statement to inspect.
- Issue #1079: email.header.decode_header now correctly parses all the examples
in RFC2047. There is a necessary visible behavior change: the leading and/or
trailing whitespace on ASCII parts is now preserved.
- Issue #14969: Better handling of exception chaining in contextlib.ExitStack
- Issue #14962: Update text coloring in IDLE shell window after changing
options. Patch by Roger Serwy.
- Issue #14963: Convert contextlib.ExitStack.__exit__ to use an iterative
algorithm (Patch by Alon Horev)
- Issue #14785: Add sys._debugmallocstats() to help debug low-level memory
allocation issues
- Issue #14443: Ensure that .py files are byte-compiled with the correct Python
executable within bdist_rpm even on older versions of RPM
C-API
-----
- Issue #13783: Inadvertent additions to the public C API in the PEP 380
implementation have either been removed or marked as private interfaces.
Extension Modules
-----------------
- Issue #15000: Support the "unique" x32 architecture in _posixsubprocess.c.
Documentation
-------------
- Issue #15081: Document PyState_FindModule.
Patch by Robin Schreiber.
- Issue #14814: Added first draft of ipaddress module API reference
Tests
-----
- Issue #14769: test_capi now has SkipitemTest, which cleverly checks
for "parity" between PyArg_ParseTuple() and the Python/getargs.c static
function skipitem() for all possible "format units".
- test_nntplib now tolerates being run from behind NNTP gateways that add
"X-Antivirus" headers to articles
- Issue #15043: test_gdb is now skipped entirely if gdb security settings
block loading of the gdb hooks
- Issue #14963: Add test cases for exception handling behaviour
in contextlib.ExitStack (Initial patch by Alon Horev)
Build
-----
- Issue #13590: Improve support for OS X Xcode 4:
* Try to avoid building Python or extension modules with problematic
llvm-gcc compiler.
* Since Xcode 4 removes ppc support, extension module builds now
check for ppc compiler support and automatically remove ppc and
ppc64 archs when not available.
* Since Xcode 4 no longer install SDKs in default locations,
extension module builds now revert to using installed headers
and libs if the SDK used to build the interpreter is not
available.
* Update ./configure to use better defaults for universal builds;
in particular, --enable-universalsdk=yes uses the Xcode default
SDK and --with-universal-archs now defaults to "intel" if ppc
not available.
- Issue #14225: Fix Unicode support for curses (#12567) on OS X
- Issue #14928: Fix importlib bootstrap issues by using a custom executable
(Modules/_freeze_importlib) to build Python/importlib.h.
What's New in Python 3.3.0 Alpha 4?
===================================
*Release date: 31-May-2012*
Core and Builtins
-----------------
- Issue #14835: Make plistlib output empty arrays & dicts like OS X.
Patch by Sidney San Martín.
- Issue #14744: Use the new _PyUnicodeWriter internal API to speed up
str%args and str.format(args).
- Issue #14930: Make memoryview objects weakrefable.
- Issue #14775: Fix a potential quadratic dict build-up due to the garbage
collector repeatedly trying to untrack dicts.
- Issue #14857: fix regression in references to PEP 3135 implicit __class__
closure variable (Reopens issue #12370)
- Issue #14712 (PEP 405): Virtual environments. Implemented by Vinay Sajip.
- Issue #14660 (PEP 420): Namespace packages. Implemented by Eric Smith.
- Issue #14494: Fix __future__.py and its documentation to note that
absolute imports are the default behavior in 3.0 instead of 2.7.
Patch by Sven Marnach.
- Issue #9260: A finer-grained import lock. Most of the import sequence
now uses per-module locks rather than the global import lock, eliminating
well-known issues with threads and imports.
- Issue #14624: UTF-16 decoding is now 3x to 4x faster on various inputs.
Patch by Serhiy Storchaka.
- asdl_seq and asdl_int_seq are now Py_ssize_t sized.
- Issue #14133 (PEP 415): Implement suppression of __context__ display with an
attribute on BaseException. This replaces the original mechanism of PEP 409.
- Issue #14417: Mutating a dict during lookup now restarts the lookup instead
of raising a RuntimeError (undoes issue #14205).
- Issue #14738: Speed-up UTF-8 decoding on non-ASCII data. Patch by Serhiy
Storchaka.
- Issue #14700: Fix two broken and undefined-behaviour-inducing overflow checks
in old-style string formatting.
- Issue #14705: The PyArg_Parse() family of functions now support the 'p' format
unit, which accepts a "boolean predicate" argument. It converts any Python
value into an integer--0 if it is "false", and 1 otherwise.
Library
-------
- Issue #14690: Use monotonic clock instead of system clock in the sched,
subprocess and trace modules.
- Issue #14958: Change IDLE systax highlighting to recognize all string and
byte literals supported in Python 3.3.
- Issue #10997: Prevent a duplicate entry in IDLE's "Recent Files" menu.
- Issue #14443: Tell rpmbuild to use the correct version of Python in
bdist_rpm. Initial patch by Ross Lagerwall.
- Issue #14929: Stop Idle 3.x from closing on Unicode decode errors when
grepping. Patch by Roger Serwy.
- Issue #12515: email now registers a defect if it gets to EOF while parsing
a MIME part without seeing the closing MIME boundary.
- Issue #12510: Attempting to get invalid tooltip no longer closes Idle.
Other tooltipss have been corrected or improved and the number of tests
has been tripled. Original patch by Roger Serwy.
- Issue #1672568: email now always decodes base64 payloads, adding padding and
ignoring non-base64-alphabet characters if needed, and registering defects
for any such problems.
- Issue #14925: email now registers a defect when the parser decides that there
is a missing header/body separator line. MalformedHeaderDefect, which the
existing code would never actually generate, is deprecated.
- Issue #10365: File open dialog now works instead of crashing even when
the parent window is closed before the dialog. Patch by Roger Serwy.
- Issue #8739: Updated smtpd to support RFC 5321, and added support for the
RFC 1870 SIZE extension.
- Issue #665194: Added a localtime function to email.utils to provide an
aware local datetime for use in setting Date headers.
- Issue #12586: Added new provisional policies that implement convenient
unicode support for email headers. See What's New for details.
- Issue #14731: Refactored email Policy framework to support full backward
compatibility with Python 3.2 by default yet allow for the introduction of
new features through new policies. Note that Policy.must_be_7bit is renamed
to cte_type.
- Issue #14876: Use user-selected font for highlight configuration.
- Issue #14920: Fix the help(urllib.parse) failure on locale C on terminals.
Have ascii characters in help.
- Issue #14548: Make multiprocessing finalizers check pid before
running to cope with possibility of gc running just after fork.
- Issue #14863: Update the documentation of os.fdopen() to reflect the
fact that it's only a thin wrapper around open() anymore.
- Issue #14036: Add an additional check to validate that port in urlparse does
not go in illegal range and returns None.
- Issue #14862: Add missing names to os.__all__
- Issue #14875: Use float('inf') instead of float('1e66666') in the json module.
- Issue #13585: Added contextlib.ExitStack
- PEP 3144, Issue #14814: Added the ipaddress module
- Issue #14426: Correct the Date format in Expires attribute of Set-Cookie
Header in Cookie.py.
- Issue #14588: The types module now provide new_class() and prepare_class()
functions to support PEP 3115 compliant dynamic class creation. Patch by
Daniel Urban and Nick Coghlan.
- Issue #13152: Allow to specify a custom tabsize for expanding tabs in
textwrap. Patch by John Feuerstein.
- Issue #14721: Send the correct 'Content-length: 0' header when the body is an
empty string ''. Initial Patch contributed by Arve Knudsen.
- Issue #14072: Fix parsing of 'tel' URIs in urlparse by making the check for
ports stricter.
- Issue #9374: Generic parsing of query and fragment portions of url for any
scheme. Supported both by RFC3986 and RFC2396.
- Issue #14798: Fix the functions in pyclbr to raise an ImportError
when the first part of a dotted name is not a package. Patch by
Xavier de Gaye.
- Issue #12098: multiprocessing on Windows now starts child processes
using the same sys.flags as the current process. Initial patch by
Sergey Mezentsev.
- Issue #13031: Small speed-up for tarfile when unzipping tarfiles.
Patch by Justin Peel.
- Issue #14780: urllib.request.urlopen() now has a ``cadefault`` argument
to use the default certificate store. Initial patch by James Oakley.
- Issue #14829: Fix bisect and range() indexing with large indices
(>= 2 ** 32) under 64-bit Windows.
- Issue #14732: The _csv module now uses PEP 3121 module initialization.
Patch by Robin Schreiber.
- Issue #14809: Add HTTP status codes introduced by RFC 6585 to http.server
and http.client. Patch by EungJun Yi.
- Issue #14777: tkinter may return undecoded UTF-8 bytes as a string when
accessing the Tk clipboard. Modify clipboad_get() to first request type
UTF8_STRING when no specific type is requested in an X11 windowing
environment, falling back to the current default type STRING if that fails.
Original patch by Thomas Kluyver.
- Issue #14773: Fix os.fwalk() failing on dangling symlinks.
- Issue #12541: Be lenient with quotes around Realm field of HTTP Basic
Authentation in urllib2.
- Issue #14807: move undocumented tarfile.filemode() to stat.filemode() and add
doc entry. Add tarfile.filemode alias with deprecation warning.
- Issue #13815: TarFile.extractfile() now returns io.BufferedReader objects.
- Issue #14532: Add a secure_compare() helper to the hmac module, to mitigate
timing attacks. Patch by Jon Oberheide.
- Add importlib.util.resolve_name().
- Issue #14366: Support lzma compression in zip files.
Patch by Serhiy Storchaka.
- Issue #13959: Introduce importlib.find_loader() and document
imp.find_module/load_module as deprecated.
- Issue #14082: shutil.copy2() now copies extended attributes, if possible.
Patch by Hynek Schlawack.
- Issue #13959: Make importlib.abc.FileLoader.load_module()/get_filename() and
importlib.machinery.ExtensionFileLoader.load_module() have their single
argument be optional. Allows for the replacement (and thus deprecation) of
imp.load_source()/load_package()/load_compiled().
- Issue #13959: imp.get_suffixes() has been deprecated in favour of the new
attributes on importlib.machinery: SOURCE_SUFFIXES, DEBUG_BYTECODE_SUFFIXES,
OPTIMIZED_BYTECODE_SUFFIXES, BYTECODE_SUFFIXES, and EXTENSION_SUFFIXES. This
led to an indirect deprecation of inspect.getmoduleinfo().
- Issue #14662: Prevent shutil failures on OS X when destination does not
support chflag operations. Patch by Hynek Schlawack.
- Issue #14157: Fix time.strptime failing without a year on February 29th.
Patch by Hynek Schlawack.
- Issue #14753: Make multiprocessing's handling of negative timeouts
the same as it was in Python 3.2.
- Issue #14583: Fix importlib bug when a package's __init__.py would first
import one of its modules then raise an error.
- Issue #14741: Fix missing support for Ellipsis ('...') in parser module.
- Issue #14697: Fix missing support for set displays and set comprehensions in
parser module.
- Issue #14701: Fix missing support for 'raise ... from' in parser module.
- Add support for timeouts to the acquire() methods of
multiprocessing's lock/semaphore/condition proxies.
- Issue #13989: Add support for text mode to gzip.open().
- Issue #14127: The os.stat() result object now provides three additional
fields: st_ctime_ns, st_mtime_ns, and st_atime_ns, providing those times as an
integer with nanosecond resolution. The functions os.utime(), os.lutimes(),
and os.futimes() now accept a new parameter, ns, which accepts mtime and atime
as integers with nanosecond resolution.
- Issue #14127 and #10148: shutil.copystat now preserves exact mtime and atime
on filesystems providing nanosecond resolution.
Tools/Demos
-----------
- Issue #14695: Bring Tools/parser/unparse.py support up to date with
the Python 3.3 Grammar.
Build
-----
- Issue #14472: Update .gitignore. Patch by Matej Cepl.
- Upgrade Windows library versions: bzip 1.0.6, OpenSSL 1.0.1c.
- Issue #14693: Under non-Windows platforms, hashlib's fallback modules are
always compiled, even if OpenSSL is present at build time.
- Issue #13210: Windows build now uses VS2010, ported from VS2008.
Documentation
-------------
- Issue #14588: The language reference now accurately documents the Python 3
class definition process. Patch by Nick Coghlan.
- Issue #14943: Correct a default argument value for winreg.OpenKey
and correctly list the argument names in the function's explanation.
What's New in Python 3.3.0 Alpha 3?
===================================
*Release date: 01-May-2012*
Core and Builtins
-----------------
- Issue #14699: Fix calling the classmethod descriptor directly.
- Issue #14433: Prevent msvcrt crash in interactive prompt when stdin is closed.
- Issue #14521: Make result of float('nan') and float('-nan') more consistent
across platforms.
- Issue #14646: __import__() sets __loader__ if the loader did not.
- Issue #14605: No longer have implicit entries in sys.meta_path. If
sys.meta_path is found to be empty, raise ImportWarning.
- Issue #14605: No longer have implicit entries in sys.path_hooks. If
sys.path_hooks is found to be empty, a warning will be raised. None is now
inserted into sys.path_importer_cache if no finder was discovered. This also
means imp.NullImporter is no longer implicitly used.
- Issue #13903: Implement PEP 412. Individual dictionary instances can now share
their keys with other dictionaries. Classes take advantage of this to share
their instance dictionary keys for improved memory and performance.
- Issue #11603 (again): Setting __repr__ to __str__ now raises a RuntimeError
when repr() or str() is called on such an object.
- Issue #14658: Fix binding a special method to a builtin implementation of a
special method with a different name.
- Issue #14630: Fix a memory access bug for instances of a subclass of int
with value 0.
- Issue #14339: Speed improvements to bin, oct and hex functions. Patch by
Serhiy Storchaka.
- Issue #14098: New functions PyErr_GetExcInfo and PyErr_SetExcInfo.
Patch by Stefan Behnel.
- Issue #14385: It is now possible to use a custom type for the __builtins__
namespace, instead of a dict. It can be used for sandboxing for example.
Raise also a NameError instead of ImportError if __build_class__ name if not
found in __builtins__.
- Issue #12599: Be more strict in accepting None compared to a false-like
object for importlib.util.module_for_loader and
importlib.machinery.PathFinder.
- Issue #14612: Fix jumping around with blocks by setting f_lineno.
- Issue #14592: Attempting a relative import w/o __package__ or __name__ set in