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NEWS
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+++++++++++
Python News
+++++++++++
What's New in Python 3.2 Beta 1?
================================
*Release date: XX-Dec-2010*
Core and Builtins
-----------------
- Issue #2690: Range objects support negative indices and slicing
- Issue #9915: Speed up sorting with a key.
- Issue #7475: Added transform() and untransform() methods to both bytes and
string types. They can be used to access those codecs providing
bytes-to-bytes and string-to-string mappings.
- Issue #8685: Speed up set difference ``a - b`` when source set ``a`` is much
larger than operand ``b``. Patch by Andrew Bennetts.
- Issue #10518: Bring back the callable() builtin.
- Issue #7094: Added alternate formatting (specified by '#') to ``__format__``
method of float, complex, and Decimal. This allows more precise control over
when decimal points are displayed.
- Issue #10474: range.count() should return integers.
- Issue #1574217: isinstance now catches only AttributeError, rather than
masking all errors.
Library
-------
- logging: Added getLogRecordFactory/setLogRecordFactory with docs and tests.
- Issue #10549: Fix pydoc traceback when text-documenting certain classes.
- Issue #2001: New HTML server with enhanced Web page features. Patch by Ron
Adam.
- Issue #10360: In WeakSet, do not raise TypeErrors when testing for membership
of non-weakrefable objects.
- Issue #940286: pydoc.Helper.help() ignores input/output init parameters.
- Issue #1745035: Add a command size and data size limit to smtpd.py, to prevent
DoS attacks. Patch by Savio Sena.
- Issue #4925: Add filename to error message when executable can't be found in
subprocess.
- Issue #10391: Don't dereference invalid memory in error messages in the ast
module.
- Issue #10027: st_nlink was not being set on Windows calls to os.stat or
os.lstat. Patch by Hirokazu Yamamoto.
- Issue #9333: Expose os.symlink only when the SeCreateSymbolicLinkPrivilege is
held by the user's account, i.e., when the function can actually be used.
- Issue #8879: Add os.link support for Windows.
- Issue #7911: ``unittest.TestCase.longMessage`` defaults to True for improved
failure messages by default. Patch by Mark Roddy.
- Issue #1486713: HTMLParser now has an optional tolerant mode where it tries to
guess at the correct parsing of invalid html.
- Issue #10554: Add context manager support to subprocess.Popen objects.
- Issue #8989: email.utils.make_msgid now has a domain parameter that can
override the domain name used in the generated msgid.
- Issue #9299: Add exist_ok parameter to os.makedirs to suppress the 'File
exists' exception when a target directory already exists with the specified
mode. Patch by Ray Allen.
- Issue #9573: os.fork() now works correctly when triggered as a side effect of
a module import.
- Issue #10464: netrc now correctly handles lines with embedded '#' characters.
- Added itertools.accumulate().
- Issue #4113: Added custom ``__repr__`` method to ``functools.partial``.
Original patch by Daniel Urban.
- Issue #10273: Rename `assertRegexpMatches` and `assertRaisesRegexp` to
`assertRegex` and `assertRaisesRegex`.
- Issue #10535: Enable silenced warnings in unittest by default.
- Issue #9873: The URL parsing functions in urllib.parse now accept ASCII byte
sequences as input in addition to character strings.
- Issue #10586: The statistics API for the new functools.lru_cache has been
changed to a single cache_info() method returning a named tuple.
- Issue #10323: itertools.islice() now consumes the minimum number of inputs
before stopping. Formerly, the final state of the underlying iterator was
undefined.
- Issue #10565: The collections.Iterator ABC now checks for both __iter__ and
__next__.
- Issue #10242: Fixed implementation of unittest.ItemsEqual and gave it a new
more informative name, unittest.CountEqual.
- Issue #10561: In pdb, clear the breakpoints by the breakpoint number.
- Issue #2986: difflib.SequenceMatcher gets a new parameter, autojunk, which can
be set to False to turn off the previously undocumented 'popularity'
heuristic. Patch by Terry Reedy and Eli Bendersky.
- Issue #9846: zipfile is now correctly closing underlying file objects.
- Issue #10459: Update CJK character names to Unicode 6.0.
- 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 #10470: 'python -m unittest' will now run test discovery by default,
when no extra arguments have been provided.
- Issue #3709: BaseHTTPRequestHandler will buffer the headers and write to
output stream only when end_headers is invoked. This is a speedup and an
internal optimization. Patch by endian.
- Issue #10220: Added inspect.getgeneratorstate. Initial patch by Rodolpho
Eckhardt.
- Issue #10453: compileall now uses argparse instead of getopt, and thus
provides clean output when called with '-h'.
- Issue #8078: Add constants for higher baud rates in the termios module. Patch
by Rodolpho Eckhardt.
- Issue #10407: Fix two NameErrors in distutils.
- Issue #10371: Deprecated undocumented functions in the trace module.
- Issue #10467: Fix BytesIO.readinto() after seeking into a position after the
end of the file.
- Issue #1682942: configparser supports alternative option/value delimiters.
- Issue #5412: configparser supports mapping protocol access.
- Issue #9411: configparser supports specifying encoding for read operations.
- Issue #9421: configparser's getint(), getfloat() and getboolean() methods
accept vars and default arguments just like get() does.
- Issue #9452: configparser supports reading from strings and dictionaries.
- configparser: accepted INI file structure is now customizable, including
comment prefixes, name of the DEFAULT section, empty lines in multiline
values, and indentation.
- Issue 10326: unittest.TestCase instances can be pickled.
- Issue 9926: Wrapped TestSuite subclass does not get __call__ executed.
- Issue #9920: Skip tests for cmath.atan and cmath.atanh applied to complex
zeros on systems where the log1p function fails to respect the sign of zero.
This fixes a test failure on AIX.
- Issue #9732: Addition of getattr_static to the inspect module.
- Issue #10446: Module documentation generated by pydoc now links to a
version-specific online reference manual.
- Make the 'No module named' exception message from importlib consistent.
- Issue #10443: Add the SSLContext.set_default_verify_paths() method.
- Issue #10440: Support RUSAGE_THREAD as a constant in the resource module.
Patch by Robert Collins.
- Issue #10429: IMAP.starttls() stored the capabilities as bytes objects, rather
than strings.
C-API
-----
- Issue #9518: Extend the PyModuleDef_HEAD_INIT macro to explicitly
zero-initialize all fields, fixing compiler warnings seen when building
extension modules with gcc with "-Wmissing-field-initializers" (implied by
"-W").
- Issue #10255: Fix reference leak in Py_InitializeEx(). Patch by Neil
Schemenauer.
- structseq.h is now included in Python.h.
- Loosen PyArg_ValidateKeywordArguments to allow dict subclasses.
Tests
-----
- regrtest.py once again ensures the test directory is removed from sys.path
when it is invoked directly as the __main__ module
- `python -m test` can be used to run the test suite as well as
`python -m test.regrtest`.
- Issue #9424: Deprecate the `unittest.TestCase` methods `assertEquals`,
`assertNotEquals`, `assertAlmostEquals`, `assertNotAlmostEquals` and `assert_`
and replace them with the correct methods in the Python test suite.
- Do not fail test_socket when the IP address of the local hostname cannot be
looked up.
- Issue #8886: Use context managers throughout test_zipfile. Patch by Eric
Carstensen.
Build
-----
- Issue #10325: Fix two issues in the fallback definitions for PY_ULLONG_MAX and
PY_LLONG_MAX that made them unsuitable for use in preprocessor conditionals.
Documentation
-------------
- Issue #10299: List the built-in functions in a table in functions.rst.
What's New in Python 3.2 Alpha 4?
=================================
*Release date: 13-Nov-2010*
Core and Builtins
-----------------
- Issue #10372: Import the warnings module only after the IO library is
initialized, so as to avoid bootstrap issues with the '-W' option.
- Issue #10293: Remove obsolete field in the PyMemoryView structure, unused
undocumented value PyBUF_SHADOW, and strangely-looking code in
PyMemoryView_GetContiguous.
- Issue #6081: Add str.format_map(), similar to ``str.format(**mapping)``.
- If FileIO.__init__ fails, close the file descriptor.
- 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 keep traceback
data (including local variables caught in the stack trace) alive infinitely.
- Issue #10186: Fix the SyntaxError caret when the offset is equal to the length
of the offending line.
- Issue #10089: Add support for arbitrary -X options on the command line. They
can be retrieved through a new attribute ``sys._xoptions``.
- Issue #4388: On Mac OS X, decode command line arguments from UTF-8, instead of
the locale encoding. If the LANG (and LC_ALL and LC_CTYPE) environment
variable is not set, the locale encoding is ISO-8859-1, whereas most programs
(including Python) expect UTF-8. Python already uses UTF-8 for the filesystem
encoding and to encode command line arguments on this OS.
- Issue #9713, #10114: Parser functions (e.g. PyParser_ASTFromFile) expect
filenames encoded to the filesystem encoding with the surrogateescape error
handler (to support undecodable bytes), instead of UTF-8 in strict mode.
- Issue #9997: Don't let the name "top" have special significance in scope
resolution.
- Issue #9862: Compensate for broken PIPE_BUF in AIX by hard coding its value as
the default 512 when compiling on AIX.
- Use locale encoding instead of UTF-8 to encode and decode filenames if
Py_FileSystemDefaultEncoding is not set.
- Issue #10095: fp_setreadl() doesn't reopen the file, instead reuse the file
descriptor.
- Issue #9418: Moved private string methods ``_formatter_parser`` and
``_formatter_field_name_split`` into a new ``_string`` module.
- Issue #9992: Remove PYTHONFSENCODING environment variable.
Library
-------
- Issue #10465: fix broken delegating of attributes by gzip._PaddedFile.
- Issue #10356: Decimal.__hash__(-1) should return -2.
- Issue #1553375: logging: Added stack_info kwarg to display stack information.
- Issue #5111: IPv6 Host in the Header is wrapped inside [ ]. Patch by Chandru.
- Fix Fraction.__hash__ so that Fraction.__hash__(-1) is -2. (See also issue
#10356.)
- Issue #4471: Add the IMAP.starttls() method to enable encryption on standard
IMAP4 connections. Original patch by Lorenzo M. Catucci.
- Issue #1466065: Add 'validate' option to base64.b64decode to raise an error if
there are non-base64 alphabet characters in the input.
- Issue #10386: Add __all__ to token module; this simplifies importing in
tokenize module and prevents leaking of private names through ``import *``.
- Issue #4471: Properly shutdown socket in IMAP.shutdown(). Patch by Lorenzo
M. Catucci.
- Fix IMAP.login() to work properly.
- Issue #9244: multiprocessing pool worker processes could terminate
unexpectedly if the return value of a task could not be pickled. Only the
``repr`` of such errors are now sent back, wrapped in an
``MaybeEncodingError`` exception.
- Issue #9244: The ``apply_async()`` and ``map_async()`` methods of
``multiprocessing.Pool`` now accepts a ``error_callback`` argument. This can
be a callback with the signature ``callback(exc)``, which will be called if
the target raises an exception.
- Issue #10022: The dictionary returned by the ``getpeercert()`` method of SSL
sockets now has additional items such as ``issuer`` and ``notBefore``.
- ``usenetrc`` is now false by default for NNTP objects.
- Issue #1926: Add support for NNTP over SSL on port 563, as well as STARTTLS.
Patch by Andrew Vant.
- Issue #10335: Add tokenize.open(), detect the file encoding using
tokenize.detect_encoding() and open it in read only mode.
- Issue #10321: Add support for binary data to smtplib.SMTP.sendmail, and a new
method send_message to send an email.message.Message object.
- Issue #6011: sysconfig and distutils.sysconfig use the surrogateescape error
handler to parse the Makefile file. Avoid a UnicodeDecodeError if the source
code directory name contains a non-ASCII character and the locale encoding is
ASCII.
- Issue #10329: The trace module writes reports using the input Python script
encoding, instead of the locale encoding. Patch written by Alexander
Belopolsky.
- Issue #10126: Fix distutils' test_build when Python was built with
--enable-shared.
- Issue #9281: Prevent race condition with mkdir in distutils. Patch by
Arfrever.
- 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 #10180: Pickling file objects is now explicitly forbidden, since
unpickling them produced nonsensical results.
- Issue #10311: The signal module now restores errno before returning from its
low-level signal handler. Patch by Hallvard B Furuseth.
- Issue #10282: Add a ``nntp_implementation`` attribute to NNTP objects.
- Issue #10283: Add a ``group_pattern`` argument to NNTP.list().
- Issue #10155: Add IISCGIHandler to wsgiref.handlers to support IIS CGI
environment better, and to correct unicode environment values for WSGI 1.0.1.
- Issue #10281: nntplib now returns None for absent fields in the OVER/XOVER
response, instead of raising an exception.
- wsgiref now implements and validates PEP 3333, rather than an experimental
extension of PEP 333. (Note: earlier versions of Python 3.x may have
incorrectly validated some non-compliant applications as WSGI compliant; if
your app validates with Python <3.2b1+, but not on this version, it is likely
the case that your app was not compliant.)
- Issue #10280: NNTP.nntp_version should reflect the highest version advertised
by the server.
- Issue #10184: Touch directories only once when extracting a tarfile.
- Issue #10199: New package, ``turtledemo`` now contains selected demo scripts
that were formerly found under Demo/turtle.
- Issue #10265: Close file objects explicitly in sunau. Patch by Brian Brazil.
- Issue #10266: uu.decode didn't close in_file explicitly when it was given as a
filename. Patch by Brian Brazil.
- Issue #10110: Queue objects didn't recognize full queues when the maxsize
parameter had been reduced.
- Issue #10160: Speed up operator.attrgetter. Patch by Christos Georgiou.
- logging: Added style option to basicConfig() to allow %, {} or $-formatting.
- Issue #5729: json.dumps() now supports using a string such as '\t' for
pretty-printing multilevel objects.
- Issue #10253: FileIO leaks a file descriptor when trying to open a file for
append that isn't seekable. Patch by Brian Brazil.
- Support context manager protocol for file-like objects returned by mailbox
``get_file()`` methods.
- Issue #10246: uu.encode didn't close file objects explicitly when filenames
were given to it. Patch by Brian Brazil.
- Issue #10198: fix duplicate header written to wave files when writeframes() is
called without data.
- Close file objects in modulefinder in a timely manner.
- Close a io.TextIOWrapper object in email.parser in a timely manner.
- Close a file object in distutils.sysconfig in a timely manner.
- Close a file object in pkgutil in a timely manner.
- Issue #10233: Close file objects in a timely manner in the tarfile module and
its test suite.
- Issue #10093: ResourceWarnings are now issued when files and sockets are
deallocated without explicit closing. These warnings are silenced by default,
except in pydebug mode.
- tarfile.py: Add support for all missing variants of the GNU sparse extensions
and create files with holes when extracting sparse members.
- Issue #10218: Return timeout status from ``Condition.wait`` in threading.
- Issue #7351: Add ``zipfile.BadZipFile`` spelling of the exception name and
deprecate the old name ``zipfile.BadZipfile``.
- Issue #5027: The standard ``xml`` namespace is now understood by
xml.sax.saxutils.XMLGenerator as being bound to
http://www.w3.org/XML/1998/namespace. Patch by Troy J. Farrell.
- Issue #5975: Add csv.unix_dialect class.
- Issue #7761: telnetlib.interact failures on Windows fixed.
- logging: Added style option to Formatter to allow %, {} or $-formatting.
- Issue #5178: Added tempfile.TemporaryDirectory class that can be used as a
context manager.
- Issue #1349106: Generator (and BytesGenerator) flatten method and Header
encode method now support a 'linesep' argument.
- Issue #5639: Add a *server_hostname* argument to ``SSLContext.wrap_socket`` in
order to support the TLS SNI extension. ``HTTPSConnection`` and ``urlopen()``
also use this argument, so that HTTPS virtual hosts are now supported.
- Issue #10166: Avoid recursion in pstats Stats.add() for many stats items.
- Issue #10163: Skip unreadable registry keys during mimetypes initialization.
- logging: Made StreamHandler terminator configurable.
- logging: Allowed filters to be just callables.
- logging: Added tests for _logRecordClass changes.
- Issue #10092: Properly reset locale in calendar.Locale*Calendar classes.
- logging: Added _logRecordClass, getLogRecordClass, setLogRecordClass to
increase flexibility of LogRecord creation.
- Issue #5117: Case normalization was needed on ntpath.relpath(). Also fixed
root directory issue on posixpath.relpath(). (Ported working fixes from
ntpath.)
- Issue #1343: xml.sax.saxutils.XMLGenerator now has an option
short_empty_elements to direct it to use self-closing tags when appropriate.
- Issue #9807 (part 1): Expose the ABI flags in sys.abiflags. Add --abiflags
switch to python-config for command line access.
- 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 #2830: Add the ``html.escape()`` function, which quotes all problematic
characters by default. Deprecate ``cgi.escape()``.
- Issue #9409: Fix the regex to match all kind of filenames, for interactive
debugging in doctests.
- Issue #9183: ``datetime.timezone(datetime.timedelta(0))`` will now return the
same instance as ``datetime.timezone.utc``.
- Issue #7523: Add SOCK_CLOEXEC and SOCK_NONBLOCK to the socket module, where
supported by the system. Patch by Nikita Vetoshkin.
- Issue #10063: file:// scheme will stop accessing remote hosts via ftp
protocol. file:// urls had fallback to access remote hosts via ftp. This was
not correct, change is made to raise a URLError when a remote host is tried to
access via file:// scheme.
- 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 #10041: The signature of optional arguments in socket.makefile() didn't
match that of io.open(), and they also didn't get forwarded properly to
TextIOWrapper in text mode. Patch by Kai Zhu.
- Issue #9003: http.client.HTTPSConnection, urllib.request.HTTPSHandler and
urllib.request.urlopen now take optional arguments to allow for server
certificate checking, as recommended in public uses of HTTPS.
- 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 #3873: Speed up unpickling from file objects that have a peek() method.
- Issue #10075: Add a session_stats() method to SSLContext objects.
- Issue #9948: Fixed problem of losing filename case information.
Extension Modules
-----------------
- Issue #6317: Now winsound.PlaySound only accepts unicode.
- Issue #6317: Now winsound.PlaySound can accept non ascii filename.
- Issue #9377: Use Unicode API for gethostname on Windows.
- Issue #10143: Update "os.pathconf" values.
- Issue #6518: Support context manager protcol for ossaudiodev types.
- Issue #678250: Make mmap flush a noop on ACCESS_READ and ACCESS_COPY.
- Issue #9054: Fix a crash occurring when using the pyexpat module with expat
version 2.0.1.
- Issue #5355: Provide mappings from Expat error numbers to string descriptions
and backwards, in order to actually make it possible to analyze error codes
provided by ExpatError.
- The Unicode database was updated to 6.0.0.
C-API
-----
- Issue #10288: The deprecated family of "char"-handling macros
(ISLOWER()/ISUPPER()/etc) have now been removed: use Py_ISLOWER() etc instead.
- Issue #9778: Hash values are now always the size of pointers. A new Py_hash_t
type has been introduced.
Tools/Demos
-----------
- Issue #10117: Tools/scripts/reindent.py now accepts source files that use
encoding other than ASCII or UTF-8. Source encoding is preserved when
reindented code is written to a file.
- Issue #7287: Demo/imputil/knee.py was removed.
Tests
-----
- Issue #3699: Fix test_bigaddrspace and extend it to test bytestrings as well
as unicode strings. Initial patch by Sandro Tosi.
- Issue #10294: Remove dead code form test_unicode_file.
- Issue #10123: Don't use non-ascii filenames in test_doctest tests. Add a new
test specific to unicode (non-ascii name and filename).
Build
-----
- Issue #10268: Add a --enable-loadable-sqlite-extensions option to configure.
- Issue #8852: Allow the socket module to build on OpenSolaris.
- Drop -OPT:Olimit compiler option.
- Issue #10094: Use versioned .so files on GNU/kfreeBSD and the GNU Hurd.
- Accept Oracle Berkeley DB 5.0 and 5.1 as backend for the dbm extension.
- Issue #7473: avoid link errors when building a framework with a different set
of architectures than the one that is currently installed.
What's New in Python 3.2 Alpha 3?
=================================
*Release date: 09-Oct-2010*
Core and Builtins
-----------------
- 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 #9738: Document PyErr_SetString() and PyErr_SetFromErrnoWithFilename()
encodings.
- ast.literal_eval() can now handle negative numbers. It is also a little more
liberal in what it accepts without compromising the safety of the evaluation.
For example, 3j+4 and 3+4+5 are both accepted.
- Issue #10006: type.__abstractmethods__ now raises an AttributeError. As a
result metaclasses can now be ABCs (see #9533).
- Issue #8670: ctypes.c_wchar supports non-BMP characters with 32 bits wchar_t.
- Issue #8670: PyUnicode_AsWideChar() and PyUnicode_AsWideCharString() replace
UTF-16 surrogate pairs by single non-BMP characters for 16 bits Py_UNICODE and
32 bits wchar_t (eg. Linux in narrow build).
- Issue #10003: Allow handling of SIGBREAK on Windows. Fixes a regression
introduced by issue #9324.
- Issue #9979: Create function PyUnicode_AsWideCharString().
- Issue #7397: Mention that importlib.import_module() is probably what someone
really wants to be using in __import__'s docstring.
- Issue #8521: Allow CreateKeyEx, OpenKeyEx, and DeleteKeyEx functions of winreg
to use named arguments.
- 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 #9808: Implement os.getlogin for Windows. Patch by Jon Anglin.
- Issue #9901: Destroying the GIL in Py_Finalize() can fail if some other
threads are still running. Instead, reinitialize the GIL on a second call to
Py_Initialize().
- All SyntaxErrors now have a column offset and therefore a caret when the error
is printed.
- Issue #9252: PyImport_Import no longer uses a fromlist hack to return the
module that was imported, but instead gets the module from sys.modules.
- Issue #9213: The range type_items now provides index() and count() methods, to
conform to the Sequence ABC. Patch by Daniel Urban and Daniel Stutzbach.
- Issue #7994: Issue a PendingDeprecationWarning if object.__format__ is called
with a non-empty format string. This is an effort to future-proof user
code. If a derived class does not currently implement __format__ but later
adds its own __format__, it would most likely break user code that had
supplied a format string. This will be changed to a DeprecationWaring in
Python 3.3 and it will be an error in Python 3.4.
- Issue #9828: Destroy the GIL in Py_Finalize(), so that it gets properly
re-created on a subsequent call to Py_Initialize(). The problem (a crash)
wouldn't appear in 3.1 or 2.7 where the GIL's structure is more trivial.
- Issue #9210: Configure option --with-wctype-functions was removed. Using the
functions from the libc caused the methods .upper() and lower() to become
locale aware and created subtly wrong results.
- Issue #9738: PyUnicode_FromFormat() and PyErr_Format() raise an error on a
non-ASCII byte in the format string.
- Issue #4617: Previously it was illegal to delete a name from the local
namespace if it occurs as a free variable in a nested block. This limitation
of the compiler has been lifted, and a new opcode introduced (DELETE_DEREF).
- 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 #9757: memoryview objects get a release() method to release the
underlying buffer (previously this was only done when deallocating the
memoryview), and gain support for the context management protocol.
- Issue #9797: pystate.c wrongly assumed that zero couldn't be a valid
thread-local storage key.
Library
-------
- Issue #2236: distutils' mkpath ignored the mode parameter.
- 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 #9437: Fix building C extensions with non-default LDFLAGS.
- Issue #4661: email can now parse bytes input and generate either converted
7bit output or bytes output. Email version bumped to 5.1.0.
- Issue #1589: Add ssl.match_hostname(), to help implement server identity
verification for higher-level protocols.
- 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
gettext.
- Issue #6706: asyncore.dispatcher now provides a handle_accepted() method
returning a (sock, addr) pair which is called when a connection has been
established with a new remote endpoint. This is supposed to be used as a
replacement for old handle_accept() and avoids the user to call accept()
directly.
- 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 #1491: BaseHTTPServer nows send a ``100 Continue`` response before
sending a 200 OK for the Expect: 100-continue request header.
- Issue #9360: Cleanup and improvements to the nntplib module. The API now
conforms to the philosophy of bytes and unicode separation in Python 3. A
test suite has also been added.
- Issue #9962: GzipFile now has the peek() method.
- Issue #9090: When a socket with a timeout fails with EWOULDBLOCK or EAGAIN,
retry the select() loop instead of bailing out. This is because select() can
incorrectly report a socket as ready for reading (for example, if it received
some data with an invalid checksum).
- Issue #3612: Added new types to ctypes.wintypes. (CHAR and pointers)
- 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 #9947: logging: Fixed locking bug in stopListening.
- Issue #9945: logging: Fixed locking bugs in addHandler/removeHandler.
- Issue #9936: Fixed executable lines' search in the trace module.
- Issue #9790: Rework imports necessary for samefile and sameopenfile
in ntpath.
- Issue #9928: Properly initialize the types exported by the bz2 module.
- Issue #1675951: Allow GzipFile to work with unseekable file objects. Patch by
Florian Festi.
- Logging: Added QueueListener class to facilitate logging usage for
performance-critical threads.
- Issue #9916: Add some missing errno symbols.
- Issue #9877: Expose sysconfig.get_makefile_filename()
- logging: Added hasHandlers() method to Logger and LoggerAdapter.
- Issue #9908: Fix os.stat() on bytes paths under Windows 7.
- Issue #2643: msync() is not called anymore when deallocating an open mmap
object, only munmap().
- logging: Changed LoggerAdapter implementation internally, to make it easier to
subclass in a useful way.
- logging: hasHandlers method was added to Logger, and isEnabledFor,
getEffectiveLevel, hasHandlers and setLevel were added to LoggerAdapter.
LoggerAdapter was introduced into the unit tests for logging.
- Issue #1686: Fix string.Template when overriding the pattern attribute.
- Issue #9854: SocketIO objects now observe the RawIOBase interface in
non-blocking mode: they return None when an operation would block (instead of
raising an exception).
- Issue #1730136: Fix the comparison between a tk.font.Font and an object of
another kind.
- Issue #9441: logging has better coverage for rotating file handlers.
- Issue #9865: collections.OrderedDict now has a __sizeof__ method.
- Issue #9854: The default read() implementation in io.RawIOBase now handles
non-blocking readinto() returning None correctly.
- Issue #1552: socket.socketpair() now returns regular socket.socket objects
supporting the whole socket API (rather than the "raw" _socket.socket
objects).
- Issue #9853: Fix the signature of SSLSocket.recvfrom() and SSLSocket.sendto()
to match the corresponding socket methods.
- Issue 9840: Added a decorator to reprlib for wrapping __repr__ methods to make
them handle recursive calls within the same thread.
- logging: Enhanced HTTPHandler with secure and credentials initializers.
- Issue #767645: Set os.path.supports_unicode_filenames to True on Mac OS X.
- Issue #9837: The read() method of ZipExtFile objects (as returned by
ZipFile.open()) could return more bytes than requested.
- Issue #9826: OrderedDict.__repr__ can now handle self-referential values:
d['x'] = d.
- Issue #9825: Using __del__ in the definition of collections.OrderedDict made
it possible for the user to create self-referencing ordered dictionaries which
become permanently uncollectable GC garbage. Reinstated the Python 3.1
approach of using weakref proxies so that reference cycles never get created
in the first place.
- Issue #9579, #9580: Fix os.confstr() for value longer than 255 bytes and
encode the value with filesystem encoding and surrogateescape (instead of
utf-8 in strict mode) . Patch written by David Watson.
- Issue #9632: Remove sys.setfilesystemencoding() function: use PYTHONFSENCODING
environment variable to set the filesystem encoding at Python startup.
sys.setfilesystemencoding() creates inconsistencies because it is unable to
reencode all filenames in all objects.
- Issue #9410: Various optimizations to the pickle module, leading to speedups
up to 4x (depending on the benchmark). Mostly ported from Unladen Swallow;
initial patch by Alexandre Vassalotti.
- The pprint module now supports printing OrderedDicts in their given order
(formerly, it would sort the keys).
- Logging: Added QueueHandler class to facilitate logging usage with
multiprocessing.
- Issue #9707: Rewritten reference implementation of threading.local which is
friendlier towards reference cycles. This change is not normally visible
since an optimized C implementation (_thread._local) is used instead.
- Issue #6394: os.getppid() is now supported on Windows. Note that it will
still return the id of the parent process after it has exited. This process
id may even have been reused by another unrelated process.
- 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 #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.
- Updates to the random module:
* Document which parts of the module are guaranteed to stay the same across
versions and which parts are subject to change.
* Update the seed() method to use all of the bits in a string instead of just
the hash value. This makes better use of the seed value and assures the
seeding is platform independent. Issue #7889.
* Improved the random()-->integer algorithm used in choice(), shuffle(),
sample(), randrange(), and randint(). Formerly, it used int(n*random())
which has a slight bias whenever n is not a power of two. Issue #9025.
* Improved documentation of arguments to randrange(). Issue #9379.
- collections.OrderedDict now supports a new method for repositioning keys to
either end.
- Issue #9754: Similarly to assertRaises and assertRaisesRegexp, unittest test
cases now also have assertWarns and assertWarnsRegexp methods to check that a
given warning type was triggered by the code under test.
- Issue #5506: BytesIO objects now have a getbuffer() method exporting a view of
their contents without duplicating them. The view is both readable and
writable.
- Issue #7566: Implement os.path.sameopenfile for Windows.
- Issue #9293: I/O streams now raise ``io.UnsupportedOperation`` when an
unsupported operation is attempted (for example, writing to a file open only
for reading).
- hashlib has two new constant attributes: algorithms_guaranteed and
algorithms_avaiable that respectively list the names of hash algorithms
guaranteed to exist in all Python implementations and the names of hash
algorithms available in the current process.
- A new package ``concurrent.futures`` as defined by PEP 3148.
C-API
-----
- Add PyErr_SyntaxLocationEx, which supports passing a column offset.
- Issue #9834: Don't segfault in PySequence_GetSlice, PySequence_SetSlice, or
PySequence_DelSlice when the object doesn't have any mapping operations
defined.
Tools/Demos
-----------
- Issue #9188: The gdb extension now handles correctly narrow (UCS2) as well as
wide (UCS4) unicode builds for both the host interpreter (embedded inside gdb)
and the interpreter under test.
Tests
-----
- Issue #9308: Added tests for importing encoded modules that do not
depend on specific stdlib modules being encoded in a certain way.
- Issue #1051: Add a script (Lib/test/make_ssl_certs.py) to generate the custom
certificate and private key files used by SSL-related certs.
- Issue #9978: Wait until subprocess completes initialization. (Win32KillTests
in test_os)
- Issue #7110: regrtest now sends test failure reports and single-failure
tracebacks to stderr rather than stdout.
- Issue #9628: fix runtests.sh -x option so more than one test can be excluded.
- Issue #9899: Fix test_tkinter.test_font on various platforms. Patch by Ned
Deily.
- Issue #9894: Do not hardcode ENOENT in test_subprocess.
- Issue #9315: Added tests for the trace module. Patch by Eli Bendersky.
- Issue #9323: Make test.regrtest.__file__ absolute, this was not always the
case when running profile or trace, for example.
- Issue #9568: Fix test_urllib2_localnet on OS X 10.3.
Build
-----
- Issue #10062: Allow building on platforms which do not have sem_timedwait.
- Issue #10054: Some platforms provide uintptr_t in inttypes.h. Patch by Akira
Kitada.
- Issue #10055: Make json C89-compliant in UCS4 mode.
- Issue #9552: Avoid unnecessary rebuild of OpenSSL. (Windows)
- 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 #9848: Stopping trying to build _weakref in setup.py as it is a built-in
module.
- Issue #9806: python-config now has an ``--extension-suffix`` option that
outputs the suffix for dynamic libraries including the ABI version name
defined by PEP 3149.
- 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
Sablé.
- 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.
What's New in Python 3.2 Alpha 2?
=================================
*Release date: 05-Sep-2010*
Core and Builtins
-----------------
- Issue #9225: Remove the ROT_FOUR and DUP_TOPX opcode, the latter replaced by
the new (and simpler) DUP_TOP_TWO. Performance isn't changed, but our