+++++++++++

Python News

+++++++++++

What's New in Python 3.3.1?

===========================

*Not yet released, see sections below for changes released in 3.3.0*

.. *Release date: 2013-XX-XX*

Core and Builtins

-----------------

- Issue #17328: Fix possible refleak in dict.setdefault.

- Issue #17223: array module: Fix a crasher when converting an array containing

invalid characters (outside range [U+0000; U+10ffff]) to Unicode:

repr(array), str(array) and array.tounicode(). Patch written by Manuel Jacob.

- Issue #17223: Fix PyUnicode_FromUnicode() for string of 1 character outside

the range U+0000-U+10ffff.

- Issue #1692335: Move initial args assignment to

BaseException.__new__ to help pickling of naive subclasses.

- Issue #17275: Corrected class name in init error messages of the C version of

BufferedWriter and BufferedRandom.

- Issue #7963: Fixed misleading error message that issued when object is

called without arguments.

- Issue #5308: Raise ValueError when marshalling too large object (a sequence

with size >= 2**31), instead of producing illegal marshal data.

- Issue #12983: Bytes literals with invalid \x escape now raise a SyntaxError

and a full traceback including line number.

- Issue #17173: Remove uses of locale-dependent C functions (isalpha() etc.)

in the interpreter.

- Issue #17137: When an Unicode string is resized, the internal wide character

string (wstr) format is now cleared.

- Issue #17043: The unicode-internal decoder no longer read past the end of

input buffer.

- Issue #17098: All modules now have __loader__ set even if they pre-exist the

bootstrapping of importlib.

- Issue #16979: Fix error handling bugs in the unicode-escape-decode decoder.

- Issue #10156: In the interpreter's initialization phase, unicode globals

are now initialized dynamically as needed.

- Issue #16980: Fix processing of escaped non-ascii bytes in the

unicode-escape-decode decoder.

- Issue #16975: Fix error handling bug in the escape-decode bytes decoder.

- Issue #14850: Now a charmap decoder treats U+FFFE as "undefined mapping"

in any mapping, not only in a string.

- Issue #16730: importlib.machinery.FileFinder now no longers raises an

exception when trying to populate its cache and it finds out the directory is

unreadable or has turned into a file. Reported and diagnosed by

David Pritchard.

- Issue #16906: Fix a logic error that prevented most static strings from being

cleared.

- Issue #11461: Fix the incremental UTF-16 decoder. Original patch by

Amaury Forgeot d'Arc.

- Issue #16881: Fix Py_ARRAY_LENGTH macro for GCC < 3.1.

- Issue #16856: Fix a segmentation fault from calling repr() on a dict with

a key whose repr raise an exception.

- Issue #16367: Fix FileIO.readall() on Windows for files larger than 2 GB.

- Issue #16455: On FreeBSD and Solaris, if the locale is C, the

ASCII/surrogateescape codec is now used, instead of the locale encoding, to

decode the command line arguments. This change fixes inconsistencies with

os.fsencode() and os.fsdecode() because these operating systems announces an

ASCII locale encoding, whereas the ISO-8859-1 encoding is used in practice.

- Issue #16761: Calling int() with base argument only now raises TypeError.

- Issue #16759: Support the full DWORD (unsigned long) range in Reg2Py

when retrieving a REG_DWORD value. This corrects functions like

winreg.QueryValueEx that may have been returning truncated values.

- Issue #14420: Support the full DWORD (unsigned long) range in Py2Reg

when passed a REG_DWORD value. Fixes OverflowError in winreg.SetValueEx.

- Issue #16597: In buffered and text IO, call close() on the underlying stream

if invoking flush() fails.

- Issue #16722: In the bytes() constructor, try to call __bytes__ on the

argument before __index__.

- Issue #16602: When a weakref's target was part of a long deallocation

chain, the object could remain reachable through its weakref even though

its refcount had dropped to zero.

- Issue #16416: On Mac OS X, operating system data are now always

encoded/decoded to/from UTF-8/surrogateescape, instead of the locale encoding

(which may be ASCII if no locale environment variable is set), to avoid

inconsistencies with os.fsencode() and os.fsdecode() functions which are

already using UTF-8/surrogateescape.

- Issue #16588: Silence unused-but-set warnings in Python/thread_pthread

- Issue #16546: Fix: ast.YieldFrom argument is now mandatory.

- Issue #16514: Fix regression causing a traceback when sys.path[0] is None

(actually, any non-string or non-bytes type).

- Issue #16306: Fix multiple error messages when unknown command line

parameters where passed to the interpreter. Patch by Hieu Nguyen.

- Issue #16215: Fix potential double memory free in str.replace(). Patch

by Serhiy Storchaka.

- Issue #16453: Fix equality testing of dead weakref objects.

- Issue #9535: Fix pending signals that have been received but not yet

handled by Python to not persist after os.fork() in the child process.

- Issue #15001: fix segfault on "del sys.modules['__main__']". Patch by Victor

Stinner.

- Issue #8271: the utf-8 decoder now outputs the correct number of U+FFFD

characters when used with the 'replace' error handler on invalid utf-8

sequences. Patch by Serhiy Storchaka, tests by Ezio Melotti.

- Issue #5765: Apply a hard recursion limit in the compiler instead of

blowing the stack and segfaulting. Initial patch by Andrea Griffini.

- Issue #16402: When slicing a range, fix shadowing of exceptions from

__index__.

- Issue #16336: fix input checking in the surrogatepass error handler.

Patch by Serhiy Storchaka.

- Issue #8401: assigning an int to a bytearray slice (e.g. b[3:4] = 5) now

raises an error.

- Fix segfaults on setting __qualname__ on builtin types and attempting to

delete it on any type.

- Issue #16345: Fix an infinite loop when ``fromkeys`` on a dict subclass

received a nonempty dict from the constructor.

- Issue #16271: Fix strange bugs that resulted from __qualname__ appearing in a

class's __dict__ and on type.

- Issue #16197: Update winreg docstrings and documentation to match code.

Patch by Zachary Ware.

- Issue #16241: Document -X faulthandler command line option.

Patch by Marek Šuppa.

- Issue #6074: Ensure cached bytecode files can always be updated by the

user that created them, even when the source file is read-only.

- Issue #14783: Improve int() docstring and switch docstrings for str(),

range(), and slice() to use multi-line signatures.

- Issue #16160: Subclass support now works for types.SimpleNamespace.

- Issue #15379: Fix passing of non-BMP characters as integers for the charmap

decoder (already working as unicode strings). Patch by Serhiy Storchaka.

- Issue #15144: Fix possible integer overflow when handling pointers as integer

values, by using `Py_uintptr_t` instead of `size_t`. Patch by Serhiy

Storchaka.

- Issue #15965: Explicitly cast `AT_FDCWD` as (int). Required on Solaris 10

(which defines `AT_FDCWD` as ``0xffd19553``), harmless on other platforms.

- Issue #15839: Convert SystemErrors in `super()` to RuntimeErrors.

- Issue #15846: Fix SystemError which happened when using `ast.parse()` in an

exception handler on code with syntax errors.

- Issue #15801: Make sure mappings passed to '%' formatting are actually

subscriptable.

- Issue #15111: __import__ should let ImportError propagate when a module that

is imported as a side-effect of using fromlist tries to import a module

that cannot be found.

Library

-------

- Issue #17521: Corrected non-enabling of logger following two calls to

fileConfig().

- Issue #17508: Corrected MemoryHandler configuration in dictConfig() where

the target handler wasn't configured first.

- Issue #17209: curses.window.get_wch() now handles correctly KeyboardInterrupt

(CTRL+c).

- Issue #5713: smtplib now handles 421 (closing connection) error codes when

sending mail by closing the socket and reporting the 421 error code via the

exception appropriate to the command that received the error response.

- Issue #17192: Update the ctypes module's libffi to v3.0.13. This

specifically addresses a stack misalignment issue on x86 and issues on

some more recent platforms.

- Issue #8862: Fixed curses cleanup when getkey is interrputed by a signal.

- Issue #17443: imaplib.IMAP4_stream was using the default unbuffered IO

in subprocess, but the imap code assumes buffered IO. In Python2 this

worked by accident. IMAP4_stream now explicitly uses buffered IO.

- Issue #17476: Fixed regression relative to Python2 in undocumented pydoc

'allmethods'; it was missing unbound methods on the class.

- Issue #16880: Do not assume _imp.load_dynamic() is defined in the imp module.

- Issue #16389: Fixed a performance regression relative to Python 3.1 in the

caching of compiled regular expressions.

- Issue #17431: Fix missing import of BytesFeedParser in email.parser.

- Issue #1285086: Get rid of the refcounting hack and speed up

urllib.parse.unquote() and urllib.parse.unquote_to_bytes().

- Issue #17368: Fix an off-by-one error in the Python JSON decoder that caused

a failure while decoding empty object literals when object_pairs_hook was

specified.

- Issue #14645: The email generator classes now produce output using the

specified linesep throughout. Previously if the prolog, epilog, or

body were stored with a different linesep, that linesep was used. This

fix corrects an RFC non-compliance issue with smtplib.send_message.

- Issue #17278: Fix a crash in heapq.heappush() and heapq.heappop() when

the list is being resized concurrently.

- Issue #16962: Use getdents64 instead of the obsolete getdents syscall

in the subprocess module on Linux.

- Issue #17018: Make Process.join() retry if os.waitpid() fails with EINTR.

- Issue #14720: sqlite3: Convert datetime microseconds correctly.

Patch by Lowe Thiderman.

- Issue #17225: JSON decoder now counts columns in the first line starting

with 1, as in other lines.

- Issue #13700: Fix byte/string handling in imaplib authentication when an

authobject is specified.

- Issue #13153: Tkinter functions now raise TclError instead of ValueError when

a string argument contains non-BMP character.

- Issue #9669: Protect re against infinite loops on zero-width matching in

non-greedy repeat. Patch by Matthew Barnett.

- Issue #13169: The maximal repetition number in a regular expression has been

increased from 65534 to 2147483647 (on 32-bit platform) or 4294967294 (on

64-bit).

- Issue #17143: Fix a missing import in the trace module. Initial patch by

Berker Peksag.

- Issue #16743: Fix mmap overflow check on 32 bit Windows.

- Issue #16800: tempfile.gettempdir() no longer left temporary files when

the disk is full. Original patch by Amir Szekely.

- Issue #16564: Fixed regression relative to Python2 in the operation of

email.encoders.encode_7or8bit when used with binary data.

- Issue #17052: unittest discovery should use self.testLoader.

- Issue #4591: Uid and gid values larger than 2**31 are supported now.

- Issue #17141: random.vonmisesvariate() no more hangs for large kappas.

- Issue #17149: Fix random.vonmisesvariate to always return results in

[0, 2*math.pi].

- Issue #1470548: XMLGenerator now works with binary output streams.

- Issue #6975: os.path.realpath() now correctly resolves multiple nested

symlinks on POSIX platforms.

- Issue #17156: pygettext.py now uses an encoding of source file and correctly

writes and escapes non-ascii characters.

- Issue #16564: Fixed regression relative to Python2 in the operation of

email.encoders.encode_noop when used with binary data.

- Issue #10355: In SpooledTemporaryFile class mode, name, encoding and

newlines properties now work for unrolled files. Obsoleted and never

working on Python 3 xreadline method now removed.

- Issue #16686: Fixed a lot of bugs in audioop module. Fixed crashes in

avgpp(), maxpp() and ratecv(). Fixed an integer overflow in add(), bias(),

and ratecv(). reverse(), lin2lin() and ratecv() no more lose precision for

32-bit samples. max() and rms() no more returns a negative result and

various other functions now work correctly with 32-bit sample -0x80000000.

- Issue #17073: Fix some integer overflows in sqlite3 module.

- Issue #17114: IDLE now uses non-strict config parser.

- Issue #16723: httplib.HTTPResponse no longer marked closed when the connection

is automatically closed.

- Issue #16948: Fix quoted printable body encoding for non-latin1 character

sets in the email package.

- Issue #16811: Fix folding of headers with no value in the provisional email

policies.

- Issue #17132: Update symbol for "yield from" grammar changes.

- Issue #17076: Make copying of xattrs more permissive of missing FS support.

Patch by Thomas Wouters.

- Issue #17089: Expat parser now correctly works with string input not only when

an internal XML encoding is UTF-8 or US-ASCII. It now accepts bytes and

strings larger than 2 GiB.

- Issue #6083: Fix multiple segmentation faults occured when PyArg_ParseTuple

parses nested mutating sequence.

- Issue #5289: Fix ctypes.util.find_library on Solaris.

- Issue #17106: Fix a segmentation fault in io.TextIOWrapper when an underlying

stream or a decoder produces data of an unexpected type (i.e. when

io.TextIOWrapper initialized with text stream or use bytes-to-bytes codec).

- Issue #15633: httplib.HTTPResponse is now mark closed when the server

sends less than the advertised Content-Length.

- Issue #6972: The zipfile module no longer overwrites files outside of

its destination path when extracting malicious zip files.

- Issue #4844: ZipFile now raises BadZipFile when opens a ZIP file with an

incomplete "End of Central Directory" record. Original patch by Guilherme

Polo and Alan McIntyre.

- Issue #17071: Signature.bind() now works when one of the keyword arguments

is named ``self``.

- Issue #12004: Fix an internal error in PyZipFile when writing an invalid

Python file. Patch by Ben Morgan.

- Issue #1602133: on Mac OS X a shared library build (``--enable-shared``)

now fills the ``os.environ`` variable correctly.

- Issue #15505: `unittest.installHandler` no longer assumes SIGINT handler is

set to a callable object.

- Issue #9290: In IDLE the sys.std* streams now implement io.TextIOBase

interface and support all mandatory methods and properties.

- Issue #13454: Fix a crash when deleting an iterator created by itertools.tee()

if all other iterators were very advanced before.

- Issue #12411: Fix to cgi.parse_multipart to correctly use bytes boundaries

and bytes data. Patch by Jonas Wagner.

- Issue #16957: shutil.which() no longer searches a bare file name in the

current directory on Unix and no longer searches a relative file path with

a directory part in PATH directories. Patch by Thomas Kluyver.

- Issue #1159051: GzipFile now raises EOFError when reading a corrupted file

with truncated header or footer.

- Issue #16993: shutil.which() now preserves the case of the path and extension

on Windows.

- Issue #16992: On Windows in signal.set_wakeup_fd, validate the file

descriptor argument.

- Issue #16422: For compatibility with the Python version, the C version of

decimal now uses strings instead of integers for rounding mode constants.

- Issue #15861: tkinter now correctly works with lists and tuples containing

strings with whitespaces, backslashes or unbalanced braces.

- Issue #10527: Use poll() instead of select() for multiprocessing pipes.

- Issue #9720: zipfile now writes correct local headers for files larger than

4 GiB.

- Issue #16955: Fix the poll() method for multiprocessing's socket

connections on Windows.

- SSLContext.load_dh_params() now properly closes the input file.

- Issue #16829: IDLE printing no longer fails if there are spaces or other

special characters in the file path.

- Issue #16900: Issue a ResourceWarning when an ssl socket is left unclosed.

- Issue #13899: \A, \Z, and \B now correctly match the A, Z, and B literals

when used inside character classes (e.g. '[\A]'). Patch by Matthew Barnett.

- Issue #15545: Fix regression in sqlite3's iterdump method where it was

failing if the connection used a row factory (such as sqlite3.Row) that

produced unsortable objects. (Regression was introduced by fix for 9750).

- Issue #16491: IDLE now prints chained exception tracebacks.

- Issue #15972: Fix error messages when os functions expecting a file name or

file descriptor receive the incorrect type.

- Issue #16828: Fix error incorrectly raised by bz2.compress(b'') and

bz2.BZ2Compressor.compress(b''). Initial patch by Martin Packman.

- Issue #16541: tk_setPalette() now works with keyword arguments.

- Issue #16820: In configparser, `parser.popitem()` no longer raises ValueError.

This makes `parser.clean()` work correctly.

- Issue #16820: In configparser, ``parser['section'] = {}`` now preserves

section order within the parser. This makes `parser.update()` preserve section

order as well.

- Issue #16820: In configparser, ``parser['DEFAULT'] = {}`` now correctly

clears previous values stored in the default section. Same goes for

``parser.update({'DEFAULT': {}})``.

- Issue #16819: IDLE method completion now correctly works for bytes literals.

- Issue #9586: Redefine SEM_FAILED on MacOSX to keep compiler happy.

- Issue #10527: make multiprocessing use poll() instead of select() if available.

- Issue #16688: Now regexes contained backreferences correctly work with

non-ASCII strings. Patch by Matthew Barnett.

- Issue #16485: Now file descriptors are closed if file header patching failed

on closing an aifc file.

- Issue #16165: sched.scheduler.run() no longer blocks a scheduler for other

threads.

- Issue #16641: Default values of sched.scheduler.enter() are no longer

modifiable.

- Issue #16504: IDLE now catches SyntaxErrors raised by tokenizer. Patch by

Roger Serwy.

- Issue #16618: Make glob.glob match consistently across strings and bytes

regarding leading dots. Patch by Serhiy Storchaka.

- Issue #16702: test_urllib2_localnet tests now correctly ignores proxies for

localhost tests.

- Issue #16511: Use default IDLE width and height if config param is not valid.

Patch Serhiy Storchaka.

- Issue #16713: Parsing of 'tel' urls using urlparse separates params from

path.

- Issue #16443: Add docstrings to regular expression match objects.

Patch by Anton Kasyanov.

- Issue #15701: Fix HTTPError info method call to return the headers information.

- Issue #16752: Add a missing import to modulefinder. Patch by Berker Peksag.

- Issue #16646: ftplib.FTP.makeport() might lose socket error details.

(patch by Serhiy Storchaka)

- Issue #16626: Fix infinite recursion in glob.glob() on Windows when the

pattern contains a wildcard in the drive or UNC path. Patch by Serhiy

Storchaka.

- Issue #15783: Except for the number methods, the C version of decimal now

supports all None default values present in decimal.py. These values were

largely undocumented.

- Issue #16298: In HTTPResponse.read(), close the socket when there is no

Content-Length and the incoming stream is finished. Patch by Eran

Rundstein.

- Issue #15872: Fix 3.3 regression introduced by the new fd-based shutil.rmtree

that caused it to not ignore certain errors when ignore_errors was set.

Patch by Alessandro Moura and Serhiy Storchaka.

- Issue #16248: Disable code execution from the user's home directory by

tkinter when the -E flag is passed to Python. Patch by Zachary Ware.

- Issue #16628: Fix a memory leak in ctypes.resize().

- Issue #13614: Fix setup.py register failure with invalid rst in description.

Patch by Julien Courteau and Pierre Paul Lefebvre.

- Issue #13512: Create ~/.pypirc securely (CVE-2011-4944). Initial patch by

Philip Jenvey, tested by Mageia and Debian.

- Issue #7719: Make distutils ignore ``.nfs*`` files instead of choking later

on. Initial patch by SilentGhost and Jeff Ramnani.

- Issue #13120: Allow to call pdb.set_trace() from thread.

Patch by Ilya Sandler.

- Issue #16585: Make CJK encoders support error handlers that return bytes per

PEP 383.

- Issue #10182: The re module doesn't truncate indices to 32 bits anymore.

Patch by Serhiy Storchaka.

- Issue #16573: In 2to3, treat enumerate() like a consuming call, so superfluous

list() calls aren't added to filter(), map(), and zip() which are directly

passed enumerate().

- Issue #16476: Fix json.tool to avoid including trailing whitespace.

- Issue #16549: Make json.tool work again on Python 3 and add tests.

Initial patch by Berker Peksag and Serhiy Storchaka.

- Issue #12848: The pure Python pickle implementation now treats object

lengths as unsigned 32-bit integers, like the C implementation does.

Patch by Serhiy Storchaka.

- Issue #16408: Fix file descriptors not being closed in error conditions

in the zipfile module. Patch by Serhiy Storchaka.

- Issue #16481: multiprocessing no longer leaks process handles on Windows.

- Issue #16140: The subprocess module no longer double closes its child

subprocess.PIPE parent file descriptors on child error prior to exec().

- Remove a bare print to stdout from the subprocess module that could have

happened if the child process wrote garbage to its pre-exec error pipe.

- Issue #16327: The subprocess module no longer leaks file descriptors

used for stdin/stdout/stderr pipes to the child when fork() fails.

- Issue #14396: Handle the odd rare case of waitpid returning 0 when not

expected in subprocess.Popen.wait().

- Issue #16411: Fix a bug where zlib.decompressobj().flush() might try to access

previously-freed memory. Patch by Serhiy Storchaka.

- Issue #16357: fix calling accept() on a SSLSocket created through

SSLContext.wrap_socket(). Original patch by Jeff McNeil.

- Issue #16409: The reporthook callback made by the legacy

urllib.request.urlretrieve API now properly supplies a constant non-zero

block_size as it did in Python 3.2 and 2.7. This matches the behavior of

urllib.request.URLopener.retrieve.

- Issue #16431: Use the type information when constructing a Decimal subtype

from a Decimal argument.

- Issue #16350: zlib.decompressobj().decompress() now accumulates data from

successive calls after EOF in unused_data, instead of only saving the argument

to the last call. decompressobj().flush() now correctly sets unused_data and

unconsumed_tail. A bug in the handling of MemoryError when setting the

unconsumed_tail attribute has also been fixed. Patch by Serhiy Storchaka.

- Issue #12759: sre_parse now raises a proper error when the name of the group

is missing. Initial patch by Serhiy Storchaka.

- Issue #16152: fix tokenize to ignore whitespace at the end of the code when

no newline is found. Patch by Ned Batchelder.

- Issue #1207589: Add Cut/Copy/Paste items to IDLE right click Context Menu

Patch by Todd Rovito.

- Issue #16230: Fix a crash in select.select() when one the lists changes

size while iterated on. Patch by Serhiy Storchaka.

- Issue #16228: Fix a crash in the json module where a list changes size

while it is being encoded. Patch by Serhiy Storchaka.

- Issue #14897: Enhance error messages of struct.pack and

struct.pack_into. Patch by Matti Mäki.

- Issue #12890: cgitb no longer prints spurious <p> tags in text

mode when the logdir option is specified.

- Issue #16307: Fix multiprocessing.Pool.map_async not calling its callbacks.

Patch by Janne Karila.

- Issue #16250: Fix URLError invocation with proper args.

- Issue #16116: Fix include and library paths to be correct when building C

extensions in venvs.

- Issue #16245: Fix the value of a few entities in html.entities.html5.

- Issue #14398: Fix size truncation and overflow bugs in the bz2 module.

- Issue #16220: wsgiref now always calls close() on an iterable response.

Patch by Brent Tubbs.

- Issue #16270: urllib may hang when used for retrieving files via FTP by using

a context manager. Patch by Giampaolo Rodola'.

- Issue #16461: Wave library should be able to deal with 4GB wav files,

and sample rate of 44100 Hz.

- Issue #16176: Properly identify Windows 8 via platform.platform()

- Issue #16114: The subprocess module no longer provides a misleading error

message stating that args[0] did not exist when either the cwd or executable

keyword arguments specified a path that did not exist.

- Issue #16169: Fix ctypes.WinError()'s confusion between errno and winerror.

- Issue #16076: Made _elementtree.Element pickleable in a way that is compatible

with the Python Element. Pickling/unpickling of xml.etree.ElementTree.Element

works again - this was a temporary regression from 3.2 where the by-default

imported _elementtree had no pickling capability.

- Issue #16089: Allow ElementTree.TreeBuilder to work again with a non-Element

element_factory (fixes a regression in SimpleTAL).

- Issue #16913: Fix Element.itertext()'s handling of text with XML entities.,

- Issue #16034: Fix performance regressions in the new `bz2.BZ2File`

implementation. Initial patch by Serhiy Storchaka.

- Issue #16112: platform.architecture does not correctly escape argument to

/usr/bin/file. Patch by David Benjamin.

- Issue #15756: `subprocess.poll()` now properly handles `errno.ECHILD` to

return a returncode of 0 when the child has already exited or cannot be waited

on.

- Issue #15323: Improve failure message of `Mock.assert_called_once_with()`.

- Issue #16064: ``unittest -m`` claims executable is "python", not "python3".

- Issue #12376: Pass on parameters in `TextTestResult.__init__()` super call.

- Issue #15222: Insert blank line after each message in mbox mailboxes.

- Issue #16013: Fix `csv.Reader` parsing issue with ending quote characters.

Patch by Serhiy Storchaka.

- Issue #15421: Fix an OverflowError in `Calendar.itermonthdates()` after

`datetime.MAXYEAR`. Patch by Cédric Krier.

- Issue #15970: `xml.etree.ElementTree` now serializes correctly the empty HTML

elements 'meta' and 'param'.

- Issue #15842: The `SocketIO.{readable,writable,seekable}` methods now raise

ValueError when the file-like object is closed. Patch by Alessandro Moura.

- Issue #15876: Fix a refleak in the `curses` module: window.encoding.

- Issue #15881: Fix `atexit` hook in `multiprocessing`. Original patch by Chris

McDonough.

- Issue #15841: The readable(), writable() and seekable() methods of

`io.BytesIO` and `io.StringIO` objects now raise ValueError when the object

has been closed. Patch by Alessandro Moura.

- Issue #16126: PyErr_Format format mismatch in _testcapimodule.c.

Patch by Serhiy Storchaka.

- Issue #15447: Use `subprocess.DEVNULL` in webbrowser, instead of opening

`os.devnull` explicitly and leaving it open.

- Issue #15509: `webbrowser.UnixBrowser` no longer passes empty arguments to

Popen when ``%action`` substitutions produce empty strings.

- Issue #12776, issue #11839: Call `argparse` type function (specified by

add_argument) only once. Before, the type function was called twice in the

case where the default was specified and the argument was given as well. This

was especially problematic for the FileType type, as a default file would

always be opened, even if a file argument was specified on the command line.

- Issue #15906: Fix a regression in `argparse` caused by the preceding change,

when ``action='append'``, ``type='str'`` and ``default=[]``.

- Issue #12268: The io module file object write methods no longer abort early

when one of its write system calls is interrupted (EINTR).

Tests

-----

- Issue #17448: test_sax now skips if there are no xml parsers available

instead of raising an ImportError.

- Issue #11420: make test suite pass with -B/DONTWRITEBYTECODE set.

Initial patch by Thomas Wouters.

- Issue #10652: make tcl/tk tests run after __all__ test, patch by

Zachary Ware.

- Issue #11963: remove human verification from test_parser and test_subprocess.

- Issue #11732: add a new suppress_crash_popup() context manager to test.support

that disables crash popups on Windows and use it in test_faulthandler and

test_capi.

- Issue #13898: test_ssl no longer prints a spurious stack trace on Ubuntu.

- Issue #17249: convert a test in test_capi to use unittest and reap threads.

- Issue #17041: Fix testing when Python is configured with the

--without-doc-strings.

- Issue #16923: Fix ResourceWarnings in test_ssl.

- Issue #15539: Added regression tests for Tools/scripts/pindent.py.

- Issue #17479: test_io now works with unittest test discovery.

Patch by Zachary Ware.

- Issue #17066: test_robotparser now works with unittest test discovery.

Patch by Zachary Ware.

- Issue #17334: test_index now works with unittest test discovery.

Patch by Zachary Ware.

- Issue #17333: test_imaplib now works with unittest test discovery.

Patch by Zachary Ware.

- Issue #17082: test_dbm* now work with unittest test discovery.

Patch by Zachary Ware.

- Issue #17079: test_ctypes now works with unittest test discovery.

Patch by Zachary Ware.

- Issue #17304: test_hash now works with unittest test discovery.

Patch by Zachary Ware.

- Issue #17303: test_future* now work with unittest test discovery.

Patch by Zachary Ware.

- Issue #17163: test_file now works with unittest test discovery.

Patch by Zachary Ware.

- Issue #16925: test_configparser now works with unittest test discovery.

Patch by Zachary Ware.

- Issue #16918: test_codecs now works with unittest test discovery.

Patch by Zachary Ware.

- Issue #16919: test_crypt now works with unittest test discovery.

Patch by Zachary Ware.

- Issue #16910: test_bytes, test_unicode, and test_userstring now work with

unittest test discovery. Patch by Zachary Ware.

- Issue #16905: test_warnings now works with unittest test discovery.

Initial patch by Berker Peksag.

- Issue #16898: test_bufio now works with unittest test discovery.

Patch by Zachary Ware.

- Issue #16888: test_array now works with unittest test discovery.

Patch by Zachary Ware.

- Issue #16896: test_asyncore now works with unittest test discovery.

Patch by Zachary Ware.

- Issue #16897: test_bisect now works with unittest test discovery.

Initial patch by Zachary Ware.

- Issue #16852: test_genericpath, test_posixpath, test_ntpath, and test_macpath

now work with unittest test discovery. Patch by Zachary Ware.

- Issue #16748: test_heapq now works with unittest test discovery.

- Issue #15324: Fix regrtest parsing of --fromfile, --match, and --randomize

options.

- Issue #16664: Add regression tests for glob's behaviour concerning entries

starting with a ".". Patch by Sebastian Kreft.

- Issue #16559: Add more tests for the json module, including some from the

official test suite at json.org. Patch by Serhiy Storchaka.

- Issue #16661: Fix the `os.getgrouplist()` test by not assuming that it gives

the same output as :command:`id -G`.

- Issue #16115: Add some tests for the executable argument to

subprocess.Popen(). Initial patch by Kushal Das.

- Issue #15304: Fix warning message when `os.chdir()` fails inside

`test.support.temp_cwd()`. Patch by Chris Jerdonek.

- Issue #15802: Fix test logic in `TestMaildir.test_create_tmp()`. Patch by

Serhiy Storchaka.

- Issue #15557: Add a test suite for the `webbrowser` module, thanks to Anton

Barkovsky.

- Issue #16698: Skip posix test_getgroups when built with OS X

deployment target prior to 10.6.

Build

-----

- Issue #16754: Fix the incorrect shared library extension on linux. Introduce

two makefile macros SHLIB_SUFFIX and EXT_SUFFIX. SO now has the value of

SHLIB_SUFFIX again (as in 2.x and 3.1). The SO macro is removed in 3.4.

- Issue #5033: Fix building of the sqlite3 extension module when the

SQLite library version has "beta" in it. Patch by Andreas Pelme.

- Issue #17228: Fix building without pymalloc.

- Issue #3718: Use AC_ARG_VAR to set MACHDEP in configure.ac.

- Issue #17031: Fix running regen in cross builds.

- Issue #3754: fix typo in pthread AC_CACHE_VAL.

- Issue #15484: Fix _PYTHON_PROJECT_BASE for srcdir != builddir builds;

use _PYTHON_PROJECT_BASE in distutils/sysconfig.py.

- Issue #17029: Let h2py search the multiarch system include directory.

- Issue #16953: Fix socket module compilation on platforms with

HAVE_BROKEN_POLL. Patch by Jeffrey Armstrong.

- Issue #16836: Enable IPv6 support even if IPv6 is disabled on the build host.

- Cross compiling needs host and build settings. configure no longer

creates a broken PYTHON_FOR_BUILD variable when --build is missing.

- Fix cross compiling issue in setup.py, ensure that lib_dirs and inc_dirs are

defined in cross compiling mode, too.

- Issue #16593: Have BSD 'make -s' do the right thing, thanks to Daniel Shahaf

- Issue #16262: fix out-of-src-tree builds, if mercurial is not installed.

- Issue #15298: ensure _sysconfigdata is generated in build directory, not

source directory.

- Issue #15833: Fix a regression in 3.3 that resulted in exceptions being

raised if importlib failed to write byte-compiled files. This affected

attempts to build Python out-of-tree from a read-only source directory.

- Issue #15923: Fix a mistake in ``asdl_c.py`` that resulted in a TypeError

after 2801bf875a24 (see #15801).

- Issue #15819: Make sure we can build Python out-of-tree from a read-only

source directory. (Somewhat related to issue #9860.)

- Issue #15587: Enable Tk high-resolution text rendering on Macs with

Retina displays. Applies to Tkinter apps, such as IDLE, on OS X

framework builds linked with Cocoa Tk 8.5.

- Issue #17161: make install now also installs a python3 man page.

Tools/Demos

-----------

- Issue #13301: use ast.literal_eval() instead of eval() in Tools/i18n/msgfmt.py

Patch by Serhiy Storchaka.

Documentation

-------------

- Issue #16642: sched.scheduler timefunc initial default is time.monotonic.

Patch by Ramchandra Apte

- Issue #17047: remove doubled words in docs and docstrings

reported by Serhiy Storchaka and Matthew Barnett.

- Issue #15465: Document the versioning macros in the C API docs rather than

the standard library docs. Patch by Kushal Das.

- Issue #16406: Combine the pages for uploading and registering to PyPI.

- Issue #16403: Document how distutils uses the maintainer field in

PKG-INFO. Patch by Jyrki Pulliainen.

- Issue #16695: Document how glob handles filenames starting with a

dot. Initial patch by Jyrki Pulliainen.

- Issue #8890: Stop advertising an insecure practice by replacing uses

of the /tmp directory with better alternatives in the documentation.

Patch by Geoff Wilson.

- Issue #17203: add long option names to unittest discovery docs.

- Issue #13094: add "Why do lambdas defined in a loop with different values

all return the same result?" programming FAQ.

- Issue #14901: Update portions of the Windows FAQ.

Patch by Ashish Nitin Patil.

- Issue #16267: Better document the 3.3+ approach to combining

@abstractmethod with @staticmethod, @classmethod and @property

- Issue #15209: Clarify exception chaining description in exceptions module

documentation

- Issue #15990: Improve argument/parameter documentation.

- Issue #16209: Move the documentation for the str built-in function to a new

str class entry in the "Text Sequence Type" section.

- Issue #13538: Improve str() and object.__str__() documentation.

- Issue #16489: Make it clearer that importlib.find_loader() requires any and

all packages to be separately imported.

- Issue #16400: Update the description of which versions of a given package

PyPI displays.

- Issue #15677: Document that zlib and gzip accept a compression level of 0 to

mean 'no compression'. Patch by Brian Brazil.

- Issue #8040: added a version switcher to the documentation. Patch by

Yury Selivanov.

- Additional comments and some style changes in the concurrent.futures URL

retrieval example

- Issue #16115: Improve subprocess.Popen() documentation around args, shell,

and executable arguments.

- Issue #15533: Clarify docs and add tests for `subprocess.Popen()`'s cwd

argument.

- Issue #15979: Improve timeit documentation.

- Issue #16036: Improve documentation of built-in `int()`'s signature and

arguments.

- Issue #15935: Clarification of `argparse` docs, re: add_argument() type and

default arguments. Patch contributed by Chris Jerdonek.

- Issue #11964: Document a change in v3.2 to the behavior of the indent

parameter of json encoding operations.

- Issue #15116: Remove references to appscript as it is no longer being

supported.

- Issue #15116: Remove references to appscript as it is no longer being

supported.

Tools/Demos

-----------

- Issue #15539: Fix a number of bugs in Tools/scripts/pindent.py. Now

pindent.py works with a "with" statement. pindent.py no longer produces

improper indentation. pindent.py now works with continued lines broken after

"class" or "def" keywords and with continuations at the start of line.

- Issue #15378: Fix Tools/unicode/comparecodecs.py. Patch by Serhiy Storchaka.

What's New in Python 3.3.0?

===========================

*Release date: 29-Sep-2012*

Core and Builtins

-----------------

- Issue #16046: Fix loading sourceless legacy .pyo files.

- Issue #16060: Fix refcounting bug when `__trunc__()` returns an object whose

`__int__()` gives a non-integer. Patch by Serhiy Storchaka.

Extension Modules

-----------------

- Issue #16012: Fix a regression in pyexpat. The parser's `UseForeignDTD()`

method doesn't require an argument again.

What's New in Python 3.3.0 Release Candidate 3?

===============================================

*Release date: 23-Sep-2012*

Core and Builtins

-----------------

- Issue #15900: Fix reference leak in `PyUnicode_TranslateCharmap()`.

- Issue #15926: Fix crash after multiple reinitializations of the interpreter.

- Issue #15895: Fix FILE pointer leak in one error branch of

`PyRun_SimpleFileExFlags()` when filename points to a pyc/pyo file, closeit is

false an and set_main_loader() fails.

- Fixes for a few crash and memory leak regressions found by Coverity.

Library

-------