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Python News

What's New in Python 3.1.3?

*Release date: 2010-11-27*

Core and Builtins

- Issue #10391: Don't dereference invalid memory in error messages in the ast


- Issue #10459: Update CJK character names to Unicode 5.1.

- Issue #10092: Properly reset locale in calendar.Locale*Calendar classes.

- Issue #6098: Don't claim DOM level 3 conformance in minidom.

- Issue #5762: Fix AttributeError raised by ``xml.dom.minidom`` when an empty
  XML namespace attribute is encountered.

- Issue #1710703: Write structures for an empty ZIP archive when a ZipFile is
  created in modes 'a' or 'w' and then closed without adding any files. Raise
  BadZipfile (rather than IOError) when opening small non-ZIP files.

- Issue #4493: urllib.request adds '/' in front of path components which does not
  start with '/. Common behavior exhibited by browsers and other clients.

- Issue #6378: idle.bat now runs with the appropriate Python version rather than
  the system default. Patch by Sridhar Ratnakumar.

- Issue #10407: Fix two NameErrors in distutils.

- Issue #10198: fix duplicate header written to wave files when writeframes()
  is called without data.

- Issue #10467: Fix BytesIO.readinto() after seeking into a position after the
  end of the file.

- Issue #1682942: configparser supports alternative option/value delimiters.


- Backport r83399 to allow test_distutils to pass on installed versions.

- Issue #1303434: Generate ZIP file containing all PDBs (already done for rc1).

- Stop packaging versioncheck tool (already done for rc1).

- Accept Oracle Berkeley DB 4.8, 5.0 and 5.1 as backend for the dbm extension.


- Issue #9424: Replace deprecated assert* methods in the Python test suite.


- Issue #10299: List the built-in functions in a table in functions.rst.

What's New in Python 3.1.3 release candidate 1?

*Release date: 2010-11-13*

Core and Builtins

- Issue #10221: dict.pop(k) now has a key error message that includes the
  missing key (same message d[k] returns for missing keys).

- Issue #5437: A preallocated MemoryError instance should not hold traceback
  data (including local variables caught in the stack trace) alive infinitely.

- Issue #10077: Fix logging of site module errors at startup.

- Issue #10186: Fix the SyntaxError caret when the offset is equal to the length
  of the offending line.

- Issue #9713, #10114: Parser functions (eg. PyParser_ASTFromFile) expects
  filenames encoded to the filesystem encoding with surrogateescape error
  handler (to support undecodable bytes), instead of UTF-8 in strict mode.

- Issue #10006: type.__abstractmethods__ now raises an AttributeError.  As a
  result metaclasses can now be ABCs (see #9533).

- Issue #9997: Don't let the name "top" have special significance in scope

- Issue #9930: Remove bogus subtype check that was causing (e.g.)
  float.__rdiv__(2.0, 3) to return NotImplemented instead of the
  expected 1.5.

- Issue #9804: ascii() now always represents unicode surrogate pairs as
  a single ``\UXXXXXXXX``, regardless of whether the character is printable
  or not.  Also, the "backslashreplace" error handler now joins surrogate
  pairs into a single character on UCS-2 builds.

- Issue #9797: pystate.c wrongly assumed that zero couldn't be a valid
  thread-local storage key.

- Issue #9737: Fix a crash when trying to delete a slice or an item from
  a memoryview object.

- Issue #7415: PyUnicode_FromEncodedObject() now uses the new buffer API
  properly.  Patch by Stefan Behnel.

- Restore GIL in nis_cat in case of error.

- Issue #9712: Fix tokenize on identifiers that start with non-ascii names.

- Issue #9688: __basicsize__ and __itemsize__ must be accessed as Py_ssize_t.

- Issue #5319: Print an error if flushing stdout fails at interpreter

- Issue #8814: function annotations (the ``__annotations__`` attribute)
  are now included in the set of attributes copied by default by
  functools.wraps and functools.update_wrapper.  Patch by Terrence Cole.

- Issue #83755:  Implicit set-to-frozenset conversion was not thread-safe.

- Issue #10068: Global objects which have reference cycles with their module's
  dict are now cleared again. This causes issue #7140 to appear again.

- Issue #9416: Fix some issues with complex formatting where the
  output with no type specifier failed to match the str output:

    - format(complex(-0.0, 2.0), '-') omitted the real part from the output,
    - format(complex(0.0, 2.0), '-') included a sign and parentheses.

- Issue #7616: Fix copying of overlapping memoryview slices with the Intel

- Issue #8271: during the decoding of an invalid UTF-8 byte sequence, only the
  start byte and the continuation byte(s) are now considered invalid, instead
  of the number of bytes specified by the start byte.
  E.g.: '\xf1\x80AB'.decode('utf-8', 'replace') now returns u'\ufffdAB' and
  replaces with U+FFFD only the start byte ('\xf1') and the continuation byte
  ('\x80') even if '\xf1' is the start byte of a 4-bytes sequence.
  Previous versions returned a single u'\ufffd'.

- Issue #6543: Write the traceback in the terminal encoding instead of utf-8.
  Fix the encoding of the modules filename. Patch written by Amaury Forgeot

- Issue #9058: Remove assertions about INT_MAX in UnicodeDecodeError.

- Issue #8941: decoding big endian UTF-32 data in UCS-2 builds could crash
  the interpreter with characters outside the Basic Multilingual Plane
  (higher than 0x10000).

- In the str.format(), raise a ValueError when indexes to arguments are too

- Issue #8766: Initialize _warnings module before importing the first module.
  Fix a crash if an empty directory called "encodings" exists in sys.path.

- PyObject_Dump() encodes unicode objects to utf8 with backslashreplace
  (instead of strict) error handler to escape surrogates

- Issue #8124: PySys_WriteStdout() and PySys_WriteStderr() don't execute
  indirectly Python signal handlers anymore because mywrite() ignores
  exceptions (KeyboardInterrupt)

- Issue #8092: Fix PyUnicode_EncodeUTF8() to support error handler producing
  unicode string (eg. backslashreplace)

- Issue #8014: Setting a T_UINT or T_PYSSIZET attribute of an object with
  PyMemberDefs could produce an internal error;  raise TypeError instead.

- Issue #8417: Raise an OverflowError when an integer larger than sys.maxsize is
  passed to bytes or bytearray.

- Issue #8329: Don't return the same lists from when no fds are

- Raise a TypeError when trying to delete a T_STRING_INPLACE struct member.

- Issue #8226: sys.setfilesystemencoding() raises a LookupError if the encoding
  is unknown

- Issue #1583863: An str subclass can now override the __str__ method

- Issue #7072: isspace(0xa0) is true on Mac OS X


- Issue #9834: Don't segfault in PySequence_GetSlice, PySequence_SetSlice, or
  PySequence_DelSlice when the object doesn't have any mapping operations

- Issue #5753: A new C API function, :cfunc:`PySys_SetArgvEx`, allows
  embedders of the interpreter to set sys.argv without also modifying
  sys.path.  This helps fix `CVE-2008-5983


- Issue #5111: IPv6 Host in the Header is wrapped inside [ ]. Patch by Chandru.

- Issue #4471: Properly shutdown socket in IMAP.shutdown().  Patch by
  Lorenzo M. Catucci.

- Fix IMAP.login() to work properly.

- Issue #10126: Fix distutils' test_build when Python was built with

- Fix typo in one sdist option (medata-check).

- Issue #9199: Fix incorrect use of distutils.cmd.Command.announce.

- Issue #1718574: Fix options that were supposed to accept arguments but did
  not in build_clib.

- Issue #9281: Prevent race condition with mkdir in distutils.  Patch by

- Issue #10229: Fix caching error in gettext.

- Issue #10252: Close file objects in a timely manner in distutils code and
  tests.  Patch by Brian Brazil, completed by Éric Araujo.

- Issue #10311: The signal module now restores errno before returning from
  its low-level signal handler.  Patch by Hallvard B Furuseth.

- The keyword only restriction for the places argument in
  unittest.TestCase.assert[Not]AlmostEqual methods has been removed.

- Issue 6706: asyncore accept() method no longer raises EWOULDBLOCK/ECONNABORTED
  on incomplete connection attempt but returns None instead.

- Issue #10266: uu.decode didn't close in_file explicitly when it was given
  as a filename.  Patch by Brian Brazil.

- Issue #10246: uu.encode didn't close file objects explicitly when filenames
  were given to it.  Patch by Brian Brazil.

- Issue #10253: FileIO leaks a file descriptor when trying to open a file
  for append that isn't seekable.  Patch by Brian Brazil.

- Issue #5027: The standard ``xml`` namespace is now understood by
  xml.sax.saxutils.XMLGenerator as being bound to  Patch by Troy J. Farrell.

- #7761: telnetlib.interact failures on Windows fixed.

- Issue #5117: Case normalization was needed on ntpath.relpath(). And
  fixed root directory issue on posixpath.relpath(). (Ported working fixes
  from ntpath)

- Issue #10041: The signature of optional arguments in socket.makefile()
  didn't match that of, and they also didn't get forwarded
  properly to TextIOWrapper in text mode.  Patch by Kai Zhu.

- Issue #6612: Fix site and sysconfig to catch os.getcwd() error, eg. if the
  current directory was deleted. Patch written by W. Trevor King.

- Issue #9759: GzipFile now raises ValueError when an operation is attempted
  after the file is closed.  Patch by Jeffrey Finkelstein.

- Issue #9042: Fix interaction of custom translation classes and caching in

- Issue #9065: tarfile no longer uses "root" as the default for the uname and
  gname field.

- Issue #8980: Fixed a failure in distutils.command check that was shadowed
  by an environment that does not have docutils. Patch by Arfrever.

- Issue #1050268: parseaddr now correctly quotes double quote and backslash
  characters that appear inside quoted strings in email addresses.

- Issue #10004: quoprimime no longer generates a traceback when confronted
  with invalid characters after '=' in a Q-encoded word.

- Issue #9950: Fix socket.sendall() crash or misbehaviour when a signal is
  received.  Now sendall() properly calls signal handlers if necessary,
  and retries sending if these returned successfully, including on sockets
  with a timeout.

- Issue #9936: Fixed executable lines' search in the trace module.

- Issue #9928: Properly initialize the types exported by the bz2 module.

- Issue #9854: The default read() implementation in io.RawIOBase now
  handles non-blocking readinto() returning None correctly.

- Issue #9853: Fix the signature of SSLSocket.recvfrom() and
  SSLSocket.sendto() to match the corresponding socket methods.

- Issue #9792: In case of connection failure, socket.create_connection()
  would swallow the exception and raise a new one, making it impossible
  to fetch the original errno, or to filter timeout errors.  Now the
  original error is re-raised.

- Issue #9826: OrderedDict.__repr__ can now handle self-referential
  values:   d['x'] = d.

- Issue #9758: When fcntl.ioctl() was called with mutable_flag set to True,
  and the passed buffer was exactly 1024 bytes long, the buffer wouldn't
  be updated back after the system call.  Original patch by Brian Brazil.

- Issue #6656: fix locale.format_string to handle escaped percents
  and mappings.

- Issue #1100562: Fix deep-copying of objects derived from the list and
  dict types.  Patch by Michele Orrù and Björn Lindqvist.

- Issue #9753: Fixed socket.dup, which did not always work correctly
  on Windows.

- Issue #1868: Eliminate subtle timing issues in thread-local objects by
  getting rid of the cached copy of thread-local attribute dictionary.

- Issue #8797: urllib2 does a retry for Basic Authentication failure instead of
  falling into recursion.

- Issue #1194222: email.utils.parsedate now returns RFC2822 compliant four
  character years even if the message contains RFC822 two character years.

- Issue #8750: Fixed MutableSet's methods to correctly handle
  reflexive operations, namely x -= x and x ^= x.

- Issue #9129: is vulnerable to DoS attacks deriving from missing
  error handling when accepting a new connection.

- Issue #658749: asyncore's connect() method now correctly interprets winsock

- Issue #9214: Set operations on KeysView or ItemsView in the collections
  module now correctly return a set.  (Patch by Eli Bendersky.)

- Issue #9617: Signals received during a low-level write operation aren't
  ignored by the buffered IO layer anymore.

- Issue #9605: posix.getlogin() decodes the username with file filesystem
  encoding and surrogateescape error handler. Patch written by David Watson.

- Issue #9603: posix.ttyname() and posix.ctermid() decode the terminal name
  using the filesystem encoding and surrogateescape error handler. Patch
  written by David Watson.

- Issue #8688: MANIFEST files created by distutils now include a magic
  comment indicating they are generated.  Manually maintained MANIFESTs
  without this marker will not be overwritten or removed.

- Issue #7467: when reading a file from a ZIP archive, its CRC is checked
  and a BadZipfile error is raised if it doesn't match (as used to be the
  case in Python 2.5 and earlier).

- Issue #9550: a BufferedReader could issue an additional read when the
  original read request had been satisfied, which could block indefinitely
  when the underlying raw IO channel was e.g. a socket.  Report and original
  patch by Jason V. Miller.

- Issue #6915: Under Windows, os.listdir() didn't release the Global
  Interpreter Lock around all system calls.  Original patch by Ryan Kelly.

- Issue #3757: thread-local objects now support cyclic garbage collection.
  Thread-local objects involved in reference cycles will be deallocated
  timely by the cyclic GC, even if the underlying thread is still running.

- Fix Issue8280 - urllib2's Request method will remove fragements in the url.
  This is how it is supposed to work, wget and curl do the same.  Previous
  behavior was wrong.

- Issue #2944: asyncore doesn't handle connection refused correctly.

- Issue #3196: email header decoding is now forgiving if an RFC2047
  encoded word encoded in base64 is lacking padding.

- Issue #8447: Make distutils.sysconfig follow symlinks in the path to
  the interpreter executable.  This fixes a failure of test_httpservers
  on OS X.

- Issue #7372: Fix pstats regression when stripping paths from profile
  data generated with the profile module.

- Issue #4108: In urllib.robotparser, if there are multiple 'User-agent: *'
  entries, consider the first one.

- Issue #8397: Raise an error when attempting to mix iteration and regular
  reads on a BZ2File object, rather than returning incorrect results.

- Issue #7909: Do not touch paths with the special prefixes ``\\.\``
  or ``\\?\`` in ntpath.normpath().

- Issue #5294: Fix the behavior of pdb's "continue" command when called
  in the top-level debugged frame.

- Issue #5727: Restore the ability to use readline when calling into pdb
  in doctests.

- Issue #6719: In pdb, do not stop somewhere in the encodings machinery
  if the source file to be debugged is in a non-builtin encoding.

- Issue #8048: Prevent doctests from failing when sys.displayhook has
  been reassigned.

- Issue #8015: In pdb, do not crash when an empty line is entered as
  a breakpoint command.

- Issue #5146: Handle UID THREAD command correctly in imaplib.

- Issue #5147: Fix the header generated for cookie files written by

- Issue #8198: In pydoc, output all help text to the correct stream
  when sys.stdout is reassigned.

- Issue #8230: Fix Lib/test/

- Issue #7395: Fix tracebacks in pstats interactive browser.

- Issue #1713: Fix os.path.ismount(), which returned true for symbolic links
  across devices.

- Issue #8826: Properly load old-style "expires" attribute in http.cookies.

- Issue #1690103: Fix initial namespace for code run with trace.main().

- Issue #9354: Provide getsockopt() in asyncore's file_wrapper.

- Issue #9448: Fix a leak of OS resources (mutexes or semaphores) when
  re-initializing a buffered IO object by calling its ``__init__`` method.

- Issue #8620: when a Cmd is fed input that reaches EOF without a final
  newline, it no longer truncates the last character of the last command line.

- Issue #3704: http.cookiejar was not properly handling URLs with a / in the

- Issue #4629: getopt raises an error if an argument ends with = whereas getopt
  doesn't except a value (eg. --help= is rejected if getopt uses ['help='] long

- Issue #7895: platform.mac_ver() no longer crashes after calling os.fork()

- Issue #9323: Fixed a bug in that resulted in loosing the
  name of the script being traced.  Patch by Eli Bendersky.

- Issue #9282: Fixed --listfuncs option of  Thanks Eli
  Bendersky for the patch.

- Issue #1555570: email no longer inserts extra blank lines when a \r\n
  combo crosses an 8192 byte boundary.

- Issue #9243: Fix sndhdr module and add unit tests, contributed by James Lee.

- Issue #9137: Fix issue in MutableMapping.update, which incorrectly
  treated keyword arguments called 'self' or 'other' specially.

- Issue #7646: The fnmatch pattern cache no longer grows without bound.

- Issue #9136: Fix 'dictionary changed size during iteration'
  RuntimeError produced when profiling the decimal module.  This was
  due to a dangerous iteration over 'locals()' in Context.__init__.

- Fix extreme speed issue in Decimal.pow when the base is an exact
  power of 10 and the exponent is tiny (for example,
  Decimal(10) ** Decimal('1e-999999999')).

- Issue #9130: Fix validation of relative imports in parser module.

- Issue #9128: Fix validation of class decorators in parser module.

- Issue #5468: urlencode to handle bytes type and other encodings in its query
  parameter. Patch by Dan Mahn.

- Issue #7673: Fix security vulnerability (CVE-2010-2089) in the audioop
  module, ensure that the input string length is a multiple of the frame size

- Issue #6589: cleanup asyncore.socket_map in case smtpd.SMTPServer constructor
  raises an exception.

- Issue #9075: In the ssl module, remove the setting of a ``debug`` flag
  on an OpenSSL structure.

- Issue #8682: The ssl module now temporary increments the reference count of
  a socket object got through ``PyWeakref_GetObject``, so as to avoid possible
  deallocation while the object is still being used.

- Issue #1368368: FancyURLOpener class changed to throw an Exception on wrong
  password instead of presenting an interactive prompt. Older behavior can be
  obtained by passing retry=True to http_error_xxx methods of FancyURLOpener.

- Issue #8203: Fix IDLE Credits dialog: view_file() uses its encoding argument.

- Issue #8720: fix regression caused by fix for #4050 by making getsourcefile
  smart enough to find source files in the linecache.

- Issue #5610: feedparser no longer eats extra characters at the end of
  a body part if the body part ends with a \r\n.

- Fix codecs.escape_encode to return the correct consumed size.

- Issue #8897: Fix sunau module, use bytes to write the header. Patch written
  by Thomas Jollans.

- Issue #6470: Drop UNC prefix in FixTk.

- Issue #4768: base64 encoded email body parts were incorrectly stored as
  binary strings.  They are now correctly converted to strings.

- Issue #8833: tarfile created hard link entries with a size field != 0 by

- Charset.body_encode now correctly handles base64 encoding by encoding
  with the output_charset before calling base64mime.encode.  Passes the
  tests from 2.x issue #1368247.

- Issue #7150: Raise OverflowError if the result of adding or subtracting
  timedelta from date or datetime falls outside of the MINYEAR:MAXYEAR range.

- Issue #4769: Fix main() function of the base64 module, use sys.stdin.buffer
  and sys.stdout.buffer (instead of sys.stdin and sys.stdout) to use the bytes

- Issue #6662: Fix parsing of malformatted charref (&#bad;), patch written by
  Fredrik Håård

- Issue #6268: Fix seek() method of, don't read or write the BOM
  twice after seek(0). Fix also reset() method of codecs, UTF-16, UTF-32 and
  StreamWriter classes.

- Issue #8782: Add a trailing newline in linecache.updatecache to the last line
  of files without one.

- Issue #8729: Return NotImplemented from collections.Mapping.__eq__ when
  comparing to a non-mapping.

- Issue #8774: tabnanny uses the encoding cookie (#coding:...) to use the
  correct encoding

- Issue #7507: Quote "!" in pipes.quote(); it is special to some shells.

- Issue #8663: distutils.log emulates backslashreplace error handler. Fix
  compilation in a non-ASCII directory if stdout encoding is ASCII (eg. if
  stdout is not a TTY).

- Issue #1285086: Speed up urllib.parse functions: quote, quote_from_bytes,
  unquote, unquote_to_bytes.

- Issue #8688: Distutils now recalculates MANIFEST everytime.

- Issue #5099: subprocess.Popen.__del__ no longer references global objects
  to prevent issues during interpreter shutdown.

- Issue #8681: Make the zlib module's error messages more informative when
  the zlib itself doesn't give any detailed explanation.

- Issue #8674: Fixed a number of incorrect or undefined-behaviour-inducing
  overflow checks in the audioop module.

- Issue #8571: Fix an internal error when compressing or decompressing a
  chunk larger than 1GB with the zlib module's compressor and decompressor

- Issue #8573: asyncore _strerror() function might throw ValueError.

- Issue #8483: asyncore.dispatcher's __getattr__ method produced confusing
  error messages when accessing undefined class attributes because of the cheap
  inheritance with the underlying socket object.

- Issue #7472: Fixed typo in email.encoders module; messages using ISO-2022
  character sets will now consistently use a Content-Transfer-Encoding of
  7bit rather than sometimes being marked as 8bit.

- Issue #4265: shutil.copyfile() was leaking file descriptors when disk fills.
  Patch by Tres Seaver.

- Issue #7755: Use an unencumbered audio file for tests.

- Issue #8621: uuid.uuid4() returned the same sequence of values in the
  parent and any children created using ``os.fork`` on MacOS X 10.6.

- Issue #8567: Fix precedence of signals in Decimal module: when a
  Decimal operation raises multiple signals and more than one of those
  signals is trapped, the specification determines the order in which
  the signals should be handled.  In many cases this order wasn't
  being followed, leading to the wrong Python exception being raised.

- Issue #7865: The close() method of :mod:`io` objects should not swallow
  exceptions raised by the implicit flush().  Also ensure that calling
  close() several times is supported.  Patch by Pascal Chambon.

- Issue #4687: Fix accuracy of garbage collection runtimes displayed with

- Issue #8354: The siginterrupt setting is now preserved for all signals,
  not just SIGCHLD.

- Issue #8464: tarfile no longer creates files with execute permissions set
  when mode="w|" is used.

- Issue #7834: Fix connect() of Bluetooth L2CAP sockets with recent versions
  of the Linux kernel.  Patch by Yaniv Aknin.

- Issue #6312: Fixed http HEAD request when the transfer encoding is chunked.
  It should correctly return an empty response now.

- Issue #8549: Fix compiling the _ssl extension under AIX.  Patch by
  Sridhar Ratnakumar.

- Issue #8391: os.execvpe() and os.getenv() supports unicode with surrogates
  and bytes strings for environment keys and values, and use
  sys.getfilesystemencoding() instead of sys.getdefautltencoding()

- Issue #2302: Fix a race condition in SocketServer.BaseServer.shutdown,
  where the method could block indefinitely if called just before the
  event loop started running.  This also fixes the occasional freezes
  witnessed in test_httpservers.

- Issue #8524: When creating an SSL socket, the timeout value of the
  original socket wasn't retained (instead, a socket with a positive timeout
  would be turned into a non-blocking SSL socket).

- Issue #5103: SSL handshake would ignore the socket timeout and block
  indefinitely if the other end didn't respond.

- The do_handshake() method of SSL objects now adjusts the blocking mode of
  the SSL structure if necessary (as other methods already do).

- Issue #8108: Fix the unwrap() method of SSL objects when the socket has
  a non-infinite timeout.  Also make that method friendlier with applications
  wanting to continue using the socket in clear-text mode, by disabling
  OpenSSL's internal readahead.  Thanks to Darryl Miles for guidance.

- Issue #8468: bz2.BZ2File() accepts str with surrogates and bytes filenames

- Issue #8496: make mailcap.lookup() always return a list, rather than an
  iterator.  Patch by Gregory Nofi.

- Issue #8195: Fix a crash in sqlite Connection.create_collation() if the
  collation name contains a surrogate character.

- Issue #8484: Load all ciphers and digest algorithms when initializing
  the _ssl extension, such that verification of some SSL certificates
  doesn't fail because of an "unknown algorithm".

- Issue #4814: timeout parameter is now applied also for connections resulting
  from PORT/EPRT commands.

- Issue #3817: ftplib.FTP.abort() method now considers 225 a valid response
  code as stated in RFC-959 at chapter 5.4.

- Issue #8394: _ctypes.dlopen() accepts bytes, bytearray and str with

- Issue #7606: XML-RPC traceback stored in X-traceback is now encoded to ASCII
  using backslashreplace error handler

- Issue #5277: Fix quote counting when parsing RFC 2231 encoded parameters.

- Issue #8383: pickle and pickletools use surrogatepass error handler when
  encoding unicode as utf8 to support lone surrogates and stay compatible with
  Python 2.x and 3.0

- Issue #8179: Fix macpath.realpath() on a non-existing path.

- Issue #8139: ossaudiodev didn't initialize its types properly, therefore
  some methods (such as oss_mixer_device.fileno()) were not available.
  Initial patch by Bertrand Janin.

- Issue #7512: shutil.copystat() could raise an OSError when the filesystem
  didn't support chflags() (for example ZFS under FreeBSD).  The error is
  now silenced.

- Issue #3890, #8222: Fix recv() and recv_into() on non-blocking SSL sockets.
  Also, enable the SSL_MODE_AUTO_RETRY flag on SSL sockets, so that blocking
  reads and writes are always retried by OpenSSL itself.

- Issue #6716/2: Backslash-replace error output in compilall.

Extension Modules

- Issue #6317: Now winsound.PlaySound can accept non ascii filename.

- Issue #9054: Fix a crash occurring when using the pyexpat module
  with expat version 2.0.1.

- Issue #10003: Allow handling of SIGBREAK on Windows. Fixes a regression
  introduced by issue #9324.

- Issue #8734: Avoid crash in msvcrt.get_osfhandle() when an invalid file
  descriptor is provided.  Patch by Pascal Chambon.

- Issue #7736: Release the GIL around calls to opendir() and closedir()
  in the posix module.  Patch by Marcin Bachry.

- Issue #4835: make PyLong_FromSocket_t() and PyLong_AsSocket_t() private
  to the socket module, and fix the width of socket descriptors to be
  correctly detected under 64-bit Windows.

- Issue #665761: ``functools.reduce()`` will no longer mask exceptions
  other than ``TypeError`` raised by the iterator argument.

- Issue #9570: Use PEP 383 decoding in os.mknod and os.mkfifo.

- Issue #9324: Add parameter validation to signal.signal on Windows in order
  to prevent crashes.

- Issue #9526: Remove some outdated (int) casts that were preventing
  the array module from working correctly with arrays of more than
  2**31 elements.

- Fix memory leak in ssl._ssl._test_decode_cert.

- Issue #8065: Fix memory leak in readline module (from failure to
  free the result of history_get_history_state()).

- Issue #9450: Fix memory leak in readline.replace_history_item and
  readline.remove_history_item for readline version >= 5.0.

- Issue #8105: Validate file descriptor passed to mmap.mmap on Windows.

- Issue #9422: Fix memory leak when re-initializing a struct.Struct object.

- Issue #7900: The getgroups(2) system call on MacOSX behaves rather oddly
  compared to other unix systems. In particular, os.getgroups() does
  not reflect any changes made using os.setgroups() but basicly always
  returns the same information as the id command.

  os.getgroups() can now return more than 16 groups on MacOSX.

- Issue #7384: If the system readline library is linked against
  ncurses, do not link the readline module against ncursesw. The
  additional restriction of linking the readline and curses modules
  against the same curses library is currently not enabled.

- Issue #8973: Add __all__ to struct module; this ensures that
  help(struct) includes documentation for the struct.Struct class.

- Issue #2810: Fix cases where the Windows registry API returns
  ERROR_MORE_DATA, requiring a re-try in order to get the complete result.


- Issue #8852: Allow the socket module to build on OpenSolaris.

- Issue #10054: Some platforms provide uintptr_t in inttypes.h.  Patch by
  Akira Kitada.

- Issue #10055: Make json C89-compliant in UCS4 mode.

- Issue #6244: Allow detect_tkinter to look for Tcl/Tk 8.6.

- Issue #1633863: Don't ignore $CC under AIX.

- Issue #9810: Compile bzip2 source files in python's project file
  directly. It used to be built with bzip2's makefile.

- Issue #941346: Improve the build process under AIX and allow Python to
  be built as a shared library.  Patch by Sébastien Sablé.

- Issue #4026: Make the fcntl extension build under AIX.  Patch by Sébastien

- Issue #3101: Helper functions _add_one_to_index_C() and
  _add_one_to_index_F() become _Py_add_one_to_index_C() and
  _Py_add_one_to_index_F(), respectively.

- Issue #9700: define HAVE_BROKEN_POSIX_SEMAPHORES under AIX 6.x.  Patch by
  Sébastien Sablé.

- Issue #3928: os.mknod() now available in Solaris, also.

- Issue #6716: Quote -x arguments of compileall in MSI installer.
  Exclude 2to3 tests from compileall.

- Issue #1628484: The Makefile doesn't ignore the CFLAGS environment
  variable anymore.  It also forwards the LDFLAGS settings to the linker
  when building a shared library.

- Issue #9701: The MacOSX installer can patch the shell profile to ensure that
  the "bin" directory inside the framework is on the shell's search path. This
  feature now also supports the ZSH shell.

- Issue #7473: avoid link errors when building a framework with a different
  set of architectures than the one that is currently installed.


- Issue #3699: Fix test_bigaddrspace and extend it to test bytestrings
  as well as unicode strings.  Initial patch by Sandro Tosi.

- Issue #9628: fix -x option so more than one test can be excluded.

- Issue #9894: Do not hardcode ENOENT in test_subprocess.

- Issue #9315: Added tests for the trace module.  Patch by Eli Bendersky.

- Issue #7564: Skip test_ioctl if another process is attached to /dev/tty.

- Issue #8857: Provide a test case for socket.getaddrinfo.

- Issue #8433: Fix test_curses failure with newer versions of ncurses.

- Issue #9496: Provide a test suite for the rlcompleter module.  Patch by
  Michele Orrù.

- Issue #9251: test_threaded_import didn't fail when run through regrtest
  if the import lock was disabled.

- Issue #7449: Skip test_socketserver if threading support is disabled

- Issue #8672: Add a zlib test ensuring that an incomplete stream can be
  handled by a decompressor object without errors (it returns incomplete
  uncompressed data).

- Issue #8629: Disable some test_ssl tests, since they give different
  results with OpenSSL 1.0.0 and higher.

- Issue #8533: regrtest uses backslashreplace error handler for stdout to avoid
  UnicodeEncodeError (write non-ASCII character to stdout using ASCII encoding)

- Issue #8576: Remove use of find_unused_port() in test_smtplib and
  test_multiprocessing.  Patch by Paul Moore.

- Issue #8531: Skip test_ascii_formatd if ctypes module is missing

- Issue #3864: Skip three test_signal tests on freebsd6 because they fail
  if any thread was previously started, most likely due to a platform bug.

- Issue #8193: Fix test_zlib failure with zlib 1.2.4.

- Issue #9568: Fix test_urllib2_localnet on OS X 10.3.


- Issue #9817: Add expat COPYING file; add expat, libffi and expat licenses
  to Doc/license.rst.

- Issue #9255: Document that the 'test' package is meant for interal Python use

- Issue #7829: Document in dis that bytecode is an implementation detail.


- Issue #7287: Demo/imputil/ was removed.

What's New in Python 3.1.2?

*Release date: 2010-03-20*

Core and Builtins

- Issue #7173: Generator finalization could invalidate sys.exc_info().


- Issue #2698: The --compiler ignored was ignored for distutils' build_ext.

- Issue #4961: Inconsistent/wrong result of askyesno function in tkMessageBox
  with Tcl/Tk-8.5.

- Issue #7356: ctypes.util: Make parsing of ldconfig output independent of
  the locale.

What's New in Python 3.1.2 release candidate 1?

*Release date: 2010-03-06*

Core and Builtins

- Issue #7544: Preallocate thread memory before creating the thread to avoid
  a fatal error in low memory condition.

- Issue #7820: The parser tokenizer restores all bytes in the right if
  the BOM check fails.

- Handle errors from looking up __prepare__ correctly.

- Issue #5939: Add additional runtime checking to ensure a valid capsule
  in Modules/_ctypes/callproc.c.

- Issue #7309: Fix unchecked attribute access when converting
  UnicodeEncodeError, UnicodeDecodeError, and UnicodeTranslateError to

- Issue #6902: Fix problem with built-in types format incorrectly with
  0 padding.

- Issue #7988: Fix default alignment to be right aligned for
  complex.__format__. Now it matches other numeric types.

- Issue #7385: Fix a crash in `MemoryView_FromObject` when
  `PyObject_GetBuffer` fails.  Patch by Florent Xicluna.

- Issue #7788: Fix an interpreter crash produced by deleting a list
  slice with very large step value.

- Issue #7561: Operations on empty bytearrays (such as `int(bytearray())`)
  could crash in many places because of the PyByteArray_AS_STRING() macro
  returning NULL.  The macro now returns a statically allocated empty
  string instead.

- Issue #7632: Fix various str -> float conversion bugs present in 2.7
  alpha 2, including: (1) a serious 'wrong output' bug that could
  occur for long (> 40 digit) input strings, (2) a crash in dtoa.c
  that occurred in debug builds when parsing certain long numeric
  strings corresponding to subnormal values, (3) a memory leak for
  some values large enough to cause overflow, and (4) a number of
  flaws that could lead to incorrectly rounded results.

- Issue #7604: Deleting an unset slotted attribute did not raise an

- Issue #7466: segmentation fault when the garbage collector is called
  in the middle of populating a tuple.  Patch by Florent Xicluna.

- Issue #7419: setlocale() could crash the interpreter on Windows when called
  with invalid values.

- Issue #6077: On Windows, files opened with tempfile.TemporaryFile in "wt+"
  mode would appear truncated on the first '0x1a' byte (aka. Ctrl+Z).

- Issue #7085: Fix crash when importing some extensions in a thread
  on MacOSX 10.6.

- Issue #7298: fixes for range and reversed(range(...)).  Iteration
  over range(a, b, c) incorrectly gave an empty iterator when a, b and
  c fit in C long but the length of the range did not.  Also fix
  several cases where reversed(range(a, b, c)) gave wrong results, and
  fix a refleak for reversed(range(a, b, c)) with large arguments.

- Issue #7244: itertools.izip_longest() no longer ignores exceptions
  raised during the formation of an output tuple.

- Issue #3297: On wide unicode builds, do not split unicode characters into

- Issue #1722344: threading._shutdown() is now called in Py_Finalize(), which
  fixes the problem of some exceptions being thrown at shutdown when the
  interpreter is killed. Patch by Adam Olsen.

- Issue #7065: Fix a crash in bytes.maketrans and bytearray.maketrans when
  using byte values greater than 127.  Patch by Derk Drukker.

- Issue #7019: Raise ValueError when unmarshalling bad long data, instead
  of producing internally inconsistent Python longs.

- Issue #6990: Fix threading.local subclasses leaving old state around
  after a reference cycle GC which could be recycled by new locals.

- Issue #6846: Fix bug where bytearray.pop() returns negative integers.

- Issue #6750: A text file opened with could duplicate its output
  when writing from multiple threads at the same time.


- Issue #7154: urllib.request can now detect the proxy settings on OSX 10.6
  (as long as the user didn't specify 'automatic proxy configuration').

- Issue #8412: os.system() now accepts bytes, bytearray and str with

- Issue #4282: Fix the main function of the profile module for a non-ASCII
  script, open the file in binary mode and not in text mode with the default
  (utf8) encoding.

- Issue #7774: Set sys.executable to an empty string if argv[0] has been set to
  an non existent program name and Python is unable to retrieve the real
  program name

- Issue #6509: fix re.sub to work properly when the pattern, the string, and
  the replacement were all bytes. Patch by Antoine Pitrou.

- Issue #1054943: Fix unicodedata.normalize('NFC', text) for the Public Review
  Issue #29

- Issue #7494: fix a crash in _lsprof (cProfile) after clearing the profiler,
  reset also the pointer to the current pointer context.

- Issue #7250: Fix info leak of os.environ across multi-run uses of

- Issue #1729305: Fix doctest to handle encode error with "backslashreplace".

- Issue #691291: should not convert end of lines on reading and

- Issue #7959: ctypes callback functions are now registered correctly
  with the cycle garbage collector.

- Issue #6666: fix bug in that applied the list of directories
  to be ignored only to the first file.  Noted by Bogdan Opanchuk.

- Issue #7597: curses.use_env() can now be called before initscr().
  Noted by Kan-Ru Chen.

- Issue #7310: fix the __repr__ of os.environ to show the environment variables.

- Issue #7970: email.Generator.flatten now correctly flattens message/rfc822
  messages parsed by email.Parser.HeaderParser.

- Issue #7361: Importlib was not handling bytecode files less than 8 bytes in
  length properly.

- Issue #7835: shelve should no longer produce mysterious warnings during
  interpreter shutdown.

- Issue #6233: ElementTree failed converting unicode characters to XML
  entities when they could't be represented in the requested output
  encoding.  Patch by Jerry Chen.

- Issue #4772: Raise a ValueError when an unknown Bluetooth protocol is
  specified, rather than fall through to AF_PACKET (in the `socket` module).
  Also, raise ValueError rather than TypeError when an unknown TIPC address
  type is specified.  Patch by Brian Curtin.

- Issue #6939: Fix file I/O objects in the `io` module to keep the original
  file position when calling `truncate()`.  It would previously change the
  file position to the given argument, which goes against the tradition of
  ftruncate() and other truncation APIs.  Patch by Pascal Chambon.

- Issue #7792: Registering non-classes to ABCs raised an obscure error.

- Issue #7785: Don't accept bytes in FileIO.write().

- Issue #7773: Fix an UnboundLocalError in platform.linux_distribution() when
  the release file is empty.

- Issue #7561: Fix crashes when using bytearray objects with the posix

- Issue #1670765: Prevent email.generator.Generator from re-wrapping
  headers in multipart/signed MIME parts, which fixes one of the sources of
  invalid modifications to such parts by Generator.

- Issue #7701: Fix crash in binascii.b2a_uu() in debug mode when given a
  1-byte argument.  Patch by Victor Stinner.

- Issue #3299: Fix possible crash in the _sre module when given bad
  argument values in debug mode.  Patch by Victor Stinner.

- Issue #7681: Use floor division in appropiate places in the wave module.

- Issue #5372: Drop the reuse of .o files in Distutils' ccompiler (since
  Extension extra options may change the output without changing the .c
  file). Initial patch by Collin Winter.

- Issue #7617: Make sure distutils.unixccompiler.UnixCCompiler recognizes
  gcc when it has a fully qualified configuration prefix. Initial patch
  by Arfrever.

- Issue #7105: Make WeakKeyDictionary and WeakValueDictionary robust against
  the destruction of weakref'ed objects while iterating.

- Issue #7455: Fix possible crash in cPickle on invalid input.  Patch by
  Victor Stinner.

- Issue #6511: ZipFile now raises BadZipfile (instead of an IOError) when
  opening an empty or very small file.

- Issue #7556: Make sure Distutils' msvc9compile reads and writes the
  MSVC XML Manifest file in text mode so string patterns can be used
  in regular expressions.

- Issue #7552: Removed line feed in the base64 Authorization header in
  the Distutils upload command to avoid an error when PyPI reads it.
  This occurs on long passwords. Initial patch by JP St. Pierre.

- Issue #7231: urllib2 cannot handle https with proxy requiring auth.  Patch by
  Tatsuhiro Tsujikawa.

- Issue #4757: `zlib.compress` and other methods in the zlib module now
  raise a TypeError when given an `str` object (rather than a `bytes`-like
  object).  Patch by Victor Stinner and Florent Xicluna.

- Issue #7349: Make methods of file objects in the io module accept None as an
  argument where file-like objects (ie StringIO and BytesIO) accept them to mean
  the same as passing no argument.

- Issue #5949: added check for correct lineends in input from IMAP server
  in imaplib.

- Fix variations of extending deques:  d.extend(d)  d.extendleft(d)  d+=d

- Issue #6986: Fix crash in the JSON C accelerator when called with the
  wrong parameter types.  Patch by Victor Stinner.

- Issue #1923: Fixed the removal of meaningful spaces when PKG-INFO is
  generated in Distutils. Patch by Stephen Emslie.

- Issue #4120: Drop reference to CRT from manifest when building extensions with

- Issue #7410: deepcopy of itertools.count was resetting the count.

- Issue #4486: When an exception has an explicit cause, do not print its
  implicit context too.  This affects the `traceback` module as well as
  built-in exception printing.

- Issue #1488943: difflib.Differ() doesn't always add hints for tab characters

- Issue #7354: distutils.tests.test_msvc9compiler - dragfullwindows can
  be 2.

- Issue #3976: pprint for sets, frozensets, and dicts now succeed when
  they contain unorderable types.

- Issue #5037: Proxy the __bytes__ special method instead to __bytes__ instead
  of __str__.

- Issue #7341: Close the internal file object in the TarFile constructor in
  case of an error.

- Issue #7293: distutils.test_msvc9compiler is fixed to work on any fresh
  Windows box. Help provided by David Bolen.

- Issue #7328: pydoc no longer corrupts sys.path when run with the '-m' switch

- Issue #7318: multiprocessing now uses a timeout when it fails to establish
  a connection with another process, rather than looping endlessly. The
  default timeout is 20 seconds, which should be amply sufficient for
  local connections.

- Issue #7282: Fix a memory leak when an RLock was used in a thread other
  than those started through `threading.Thread` (for example, using

- Issue #7187: Importlib would not silence the IOError raised when trying to
  write new bytecode when it was made read-only.

- Issue #7264: Fix a possible deadlock when deallocating thread-local objects
  which are part of a reference cycle.

- Issue #6896: mailbox.Maildir now invalidates its internal cache each time
  a modification is done through it.  This fixes inconsistencies and test
  failures on systems with slightly bogus mtime behaviour.

- Issue #6665: Fix fnmatch to properly match filenames with newlines in them.

- Issue #7246 & Issue #7208: getpass now properly flushes input before
  reading from stdin so that existing input does not confuse it and
  lead to incorrect entry or an IOError.  It also properly flushes it
  afterwards to avoid the terminal echoing the input afterwards on
  OSes such as Solaris.

- Issue #7233: Fix a number of two-argument Decimal methods to make
  sure that they accept an int or long as the second argument.  Also
  fix buggy handling of large arguments (those with coefficient longer
  than the current precision) in shift and rotate.

- Issue #7205: Fix a possible deadlock when using a BZ2File object from
  several threads at once.

- Issue #7071: byte-compilation in Distutils is now done with respect to

- Issue #7099: Decimal.is_normal now returns True for numbers with exponent
  larger than emax.

- Issue #7080: locale.strxfrm() raises a MemoryError on 64-bit non-Windows
  platforms, and assorted locale fixes by Derk Drukker.

- Issue #5833: Fix extra space character in readline completion with the
  GNU readline library version 6.0.

- Issue #6894: Fixed the issue urllib2 doesn't respect "no_proxy" environment

- Issue #7082: When falling back to the MIME 'name' parameter, the
  correct place to look for it is the Content-Type header.

- Make tokenize.detect_coding() normalize utf-8 and iso-8859-1 variants like the
  builtin tokenizer.

- Issue #7048: Force Decimal.logb to round its result when that result
  is too large to fit in the current precision.

- Issue #6236, #6348: Fix various failures in the I/O library under AIX
  and other platforms, when using a non-gcc compiler. Patch by Derk Drukker.

- Issue #6954: Fixed crash when using DISTUTILS_DEBUG flag in Distutils.

- Issue #4606: Passing 'None' if ctypes argtype is set to POINTER(...)
  does now always result in NULL.

- Issue #5042: Structure sub-subclass does now initialize correctly
  with base class positional arguments.

- Issue #6882: Import uuid creates zombies processes.

- Issue #6635: Fix profiler printing usage message.

- Issue #6888: pdb's alias command was broken when no arguments were given.

- 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 #6239: ctypes.c_char_p return value must return bytes.

- Issue #6838: Use a list to accumulate the value instead of
  repeatedly concatenating strings in http.client's
  HTTPResponse._read_chunked providing a significant speed increase
  when downloading large files servend with a Transfer-Encoding of 'chunked'.

- Have importlib raise ImportError if None is found in sys.modules for a

- Issue #6794: Fix Decimal.compare_total and Decimal.compare_total_mag: NaN
  payloads are now ordered by integer value rather than lexicographically.

- Issue #6163: Fixed HP-UX runtime library dir options in
  distutils.unixcompiler. Initial patch by Sridhar Ratnakumar and
  Michael Haubenwallner.

- Issue #7066: archive_util.make_archive now restores the cwd if an error is
  raised. Initial patch by Ezio Melotti.

- Issue #7481: When a threading.Thread failed to start it would leave the
  instance stuck in initial state and present in threading.enumerate().

- Issue #1068268: The subprocess module now handles EINTR in internal
  os.waitpid and system calls where appropriate.

- Issue #9315: Fix for the trace module to record correct class name
  for tracing methods.

Extension Modules

- Issue #9277: Fix bug in struct.pack for bools in standard mode
  (e.g., struct.pack('>?')):  if conversion to bool raised an exception
  then that exception wasn't properly propagated on machines where
  char is unsigned.

- Issue #5180: Fixed a bug that prevented loading 2.x pickles in 3.x
  python when they contain instances of old-style classes.

- Issue #7670: sqlite3: Fixed crashes when operating on closed connections.

- Stop providing crtassem.h symbols when compiling with Visual Studio 2010, as
  msvcr100.dll is not a platform assembly anymore.

- Issue #7078: Set struct.__doc__ from _struct.__doc__.

- Issue #6848: Fix curses module build failure on OS X 10.6.

- Expat: Fix DoS via XML document with malformed UTF-8 sequences

- Issue #7999: os.setreuid() and os.setregid() would refuse to accept a -1
  parameter on some platforms such as OS X.


- Issue #7924: Fix an intermittent 'XXX undetected error' failure in
  test_capi (only seen so far on platforms where the curses module
  wasn't built), due to an uncleared exception.

- issue #7728: test_timeout was changed to use
  instead of a hard coded port.

- Issue #7376: instead of running a self-test (which was failing) when called
  with no arguments, now gives a usage message.

- Issue #7498: test_multiprocessing now uses
  instead of a hardcoded port number in test_rapid_restart.

- Issue #7431: use TESTFN in test_linecache instead of trying to create a
  file in the Lib/test directory, which might be read-only for the
  user running the tests.

- Issue #7324: add a sanity check to regrtest argument parsing to
  catch the case of an option with no handler.

- Issue #6551: test_zipimport could import and then destroy some modules of
  the encodings package, which would make other tests fail further down
  the road because the internally cached encoders and decoders would point
  to empty global variables.

- Issue #7295: Do not use a hardcoded file name in test_tarfile.

- Issue #7270: Add some dedicated unit tests for multi-thread synchronization
  primitives such as Lock, RLock, Condition, Event and Semaphore.

- Issue #7248 (part 2): Use a unique temporary directory for importlib source
  tests instead of tempfile.tempdir. This prevents the tests from sharing state
  between concurrent executions on the same system.

- Issue #7248: In importlib.test.source.util a try/finally block did not make
  sure that some referenced objects actually were created in the block before
  calling methods on the object.

- Issue #7055: test___all__ now greedily detects all modules which have an
  __all__ attribute, rather than using a hardcoded and incomplete list.

- Issue #7058: Added save/restore for argv and os.environ to runtest_inner
  in regrtest, with warnings if the called test modifies them.

- Issue #7042: Fix test_signal (test_itimer_virtual) failure on OS X 10.6.


- Make PyUnicode_CompareWithASCIIString return not equal if the Python string
  has '\0' at the end.

- Issue #7414: 'C' code wasn't being skipped properly (for keyword arguments)
  in PyArg_ParseTupleAndKeywords.


- Issue #9280: Make sharedinstall depend on sharedmods.

- Issue #8854: Fix finding Visual Studio 2008 on Windows x64.

- Issue #3920, #7903: Define _BSD_SOURCE on OpenBSD 4.4 through 4.9.

- Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the
  private memory allocation scheme in dtoa.c and use PyMem_Malloc and
  PyMem_Free instead.  Also disable caching of powers of 5.

- Switch to OpenSSL 0.9.8l on Windows.

- Issue #6603: Change READ_TIMESTAMP macro in ceval.c so that it
  compiles correctly under gcc on x86-64.  This fixes a reported
  problem with the --with-tsc build on x86-64.

- Issue #6802: Fix build issues on MacOSX 10.6

- Issue #6801 : symmetric_difference_update also accepts |.
  Thanks to Carl Chenet.

- Issue #7541: when using ``python-config`` with a framework install the
  compiler might use the wrong library.

- Issue #6491: Allow --with-dbmliborder to specify that no dbms will be built.

- Issue #7589: Only build the nis module when the correct header files are


- Updating `Using Python` documentation to include description of CPython's
  -J and -X options.

- Issue #6556: Fixed the Distutils configuration files location explanation
  for Windows.

- Update python manual page (options -B, -O0, -s, environment variables

- Issue #8909: Added the size of the bitmap used in the installer created by
  distutils' bdist_wininst. Patch by Anatoly Techtonik.

What's New in Python 3.1.1?

*Release date: 2009-08-13*

Core and Builtins

- 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 #6428: Since Python 3.0, the __bool__ method must return a bool
  object, and not an int.  Fix the corresponding error message, and the

- Issue #6347: Include inttypes.h as well as stdint.h in pyport.h.
  This fixes a build failure on HP-UX: int32_t and uint32_t are
  defined in inttypes.h instead of stdint.h on that platform.

- Issue #6373: Fixed a SystemError when encoding with the latin-1 codec and
  the 'surrogateescape' error handler, a string which contains unpaired


- Issue #6624: yArg_ParseTuple with "s" format when parsing argument with
  NUL: Bogus TypeError detail string.

- Issue #6405: Remove duplicate type declarations in descrobject.h.

- The code flags for old __future__ features are now available again.


- Issue #6106: telnetlib.Telnet.process_rawq doesn't handle default WILL/WONT
  DO/DONT correctly.

- Issue #6126: Fixed pdb command-line usage.

- Issue #6629: Fix a data corruption issue in the new I/O library, which could
  occur when writing to a BufferedRandom object (e.g. a file opened in "rb+" or
  "wb+" mode) after having buffered a certain amount of data for reading. This
  bug was not present in the pure Python implementation.

- Issue #6622: Fix "local variable 'secret' referenced before
  assignment" bug in POP3.apop.

- 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 #2715: Remove remnants of Carbon.File from binhex module.

- 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].

- Issues #5155, #5313, #5331: multiprocessing.Process._bootstrap was
unconditionally calling "os.close(sys.stdin.fileno())" resulting in file
descriptor errors

- Issue #1424152: Fix for http.client, urllib.request to support SSL while
working through proxy. Original patch by Christopher Li, changes made by
Senthil Kumaran

- did not inherit from like
the documentation said it did even though the code in PyLoader relied on the
abstract method required by ResourceLoader.

- Issue #6431: Make Fraction type return NotImplemented when it doesn't
know how to handle a comparison without loss of precision.  Also add
correct handling of infinities and nans for comparisons with float.

- Issue #6415: Fixed warnings.warn segfault on bad formatted string.

- Issue #6358: The exit status of a command started with os.popen() was
reported differently than it did with python 2.x.

- Issue #6323: The pdb debugger did not exit when running a script with a
syntax error.

- Issue #3392: The subprocess communicate() method no longer fails in select()
  when file descriptors are large; communicate() now uses poll() when possible.

- Issue #6369: Fix an RLE decompression bug in the binhex module.

- Issue #6344: Fixed a crash of when passed a negative argument.

- Issue #4005: Fixed a crash of pydoc when there was a zip file present in

Extension Modules

- Fix a segfault in expat.

- Issue #4509: array.array objects are no longer modified after an operation
  failing due to the resize restriction in-place when the object has exported


- Issue #4601: 'make install' did not set the appropriate permissions on

- Issue #5390: Add uninstall icon independent of whether file
extensions are installed.


- Fix a test in importlib.test.source.test_abc_loader that was incorrectly
testing when a .pyc file lacked an code object bytecode.

What's New in Python 3.1?

*Release date: 27-June-2009*

Core and Builtins

- Issue #6334: Fix bug in range length calculation for ranges with
large arguments.

- Issue #6329: Fixed iteration for memoryview objects (it was being blocked
because it wasn't recognized as a sequence).


- Issue #6314: logging.basicConfig() performs extra checks on the "level"

- Issue #6274: Fixed possible file descriptors leak in

- Accessing io.StringIO.buffer now raises an AttributeError instead of

- Issue #6271: mmap tried to close invalid file handle (-1) when anonymous.
(On Unix)

- Issue #1202: zipfile module would cause a struct.error when attempting to
store files with a CRC32 > 2**31-1.

Extension Modules

- Issue #5590: Remove unused global variable in pyexpat extension.

What's New in Python 3.1 Release Candidate 2?

*Release date: 13-June-2009*

Core and Builtins

- Fixed SystemError triggered by "range([], 1, -1)".

- Issue #5924: On Windows, a large PYTHONPATH environment variable
(more than 255 characters) would be completely ignored.

- Issue #4547: When debugging a very large function, it was not always
possible to update the lineno attribute of the current frame.

- Issue #5330: C functions called with keyword arguments were not reported by
  the various profiling modules (profile, cProfile). Patch by Hagen Fürstenau.


- Issue #6438: Fixed distutils.cygwinccompiler.get_versions : the regular
expression string pattern was trying to match against a bytes returned by
Popen. Tested under win32 to build the py-postgresql project.

- Issue #6258: Support AMD64 in bdist_msi.

- Issue #6195: fixed doctest to no longer try to read 'source' data from
binary files.

- Issue #5262: Fixed bug in next rollover time computation in

- Issue #6217: The C implementation of io.TextIOWrapper didn't include the
errors property.  Additionally, the errors and encoding properties of StringIO
are always None now.

- Issue #6137: The pickle module now translates module names when loading
or dumping pickles with a 2.x-compatible protocol, in order to make data
sharing and migration easier. This behaviour can be disabled using the
new `fix_imports` optional argument.

- Removed the ipaddr module.

- Issue #3613: base64.{encode,decode}string are now called
base64.{encode,decode}bytes which reflects what type they accept and return.
The old names are still there as deprecated aliases.

- Issue #5767: Remove sgmlop support from xmlrpc.client.

- Issue #6150: Fix test_unicode on wide-unicode builds.

- Issue #6149: Fix initialization of WeakValueDictionary objects from non-empty


- Issue #6221: Delete test registry key before running the test.

- Issue #6158: Package Sine-1000Hz-300ms.aif in MSI file.


- Issue #5735: Python compiled with --with-pydebug should throw an
  ImportError when trying to import modules compiled without
  --with-pydebug, and vice-versa.


- Issue #6154: Make sure the intl library is added to LIBS if needed. Also
  added LIBS to OS X framework builds.

- Issue #5809: Specifying both --enable-framework and --enable-shared is
  an error. Configure now explicity tells you about this.

What's New in Python 3.1 release candidate 1?

*Release date: 2009-05-30*

Core and Builtins

- Issue #6097: Escape UTF-8 surrogates resulting from mbstocs conversion
  of the command line.

- Issue #6012: Add cleanup support to O& argument parsing.

- Issue #6089: Fixed str.format with certain invalid field specifiers
  that would raise SystemError.

- Issue #5982: staticmethod and classmethod now expose the wrapped
  function with __func__.

- Added support for multiple context managers in the same with-statement.
  Deprecated contextlib.nested() which is no longer needed.

- Issue #5829: complex("1e500") no longer raises OverflowError.  This
  makes it consistent with float("1e500") and interpretation of real
  and imaginary literals.

- Issue #3527: Removed Py_WIN_WIDE_FILENAMES which is not used any more.

- Issue #5994: the marshal module now has docstrings.

- Issue #5981: Fix three minor inf/nan issues in float.fromhex:
  (1) inf and nan strings with trailing whitespace were incorrectly
  rejected;  (2) parsing of strings representing infinities and nans
  was locale aware; and (3) the interpretation of fromhex('-nan')
  didn't match that of float('-nan').


- Issue #4859: Implement PEP 383 for pwd, spwd, and grp.

- smtplib 'login' and 'cram-md5' login are also fixed (see Issue #5259).

- Issue #6121: pydoc now ignores leading and trailing spaces in the
  argument to the 'help' function.

- Issue #6118: urllib.parse.quote_plus ignored the encoding and errors
  arguments for strings with a space in them.

- collections.namedtuple() was not working with the following field
  names:  cls, self, tuple, itemgetter, and property.

- In unittest, using a skipping decorator on a class is now equivalent to
  skipping every test on the class.  The ClassTestSuite class has been removed.

- Issue #6050: Don't fail extracting a directory from a zipfile if
  the directory already exists.

- 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.

- Issue #5761: Add the name of the underlying file to the repr() of various
  IO objects.

- Issue #5259: smtplib plain auth login no longer gives a traceback.  Fix
  by Musashi Tamura, tests by Marcin Bachry.

- 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 #2116: Weak references and weak dictionaries now support copy()ing and

- Issue #1655: Make imaplib IPv6-capable. Patch by Derek Morr.

- Issue #5918: Fix a crash in the parser module.

- Issue #1664: Make nntplib IPv6-capable. Patch by Derek Morr.

- Issue #5006: Better handling of unicode byte-order marks (BOM) in the io
  library. This means, for example, that opening an UTF-16 text file in
  append mode doesn't add a BOM at the end of the file if the file isn't

- Issue #4050: inspect.findsource/getsource now raise an IOError if the 'source'
  file is a binary.  Patch by Brodie Rao, tests by Daniel Diniz.  This fix
  corrects a pydoc regression.

- 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 #6047: fullinstall has been removed because Python 3's executable will
  now be known as python3.

- Lib/ is no longer installed as a script.

Extension Modules

- Issue #3061: Use wcsftime for time.strftime where available.

- Issue #4873: Fix resource leaks in error cases of pwd and grp.

- Issue #6093: Fix off-by-one error in locale.strxfrm.

- The _functools and _locale modules are now built into the libpython shared
  library instead of as extension modules.


- Issue #3585: Add pkg-config support. It creates a python-2.7.pc file
  and a python3.pc symlink in the $(LIBDIR)/pkgconfig directory. Patch by
  Clinton Roy.


- Issue #5442: Tests for importlib were not properly skipping case-sensitivity
  tests on darwin even when the OS was installed on a case-sensitive
  filesystem. Also fixed tests that should not be run when
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