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Python News
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What's New in Python 3.5 alpha 1?
=================================
Release date: TBA
Core and Builtins
-----------------
- Issue #21523: Fix over-pessimistic computation of the stack effect of
some opcodes in the compiler. This also fixes a quadratic compilation
time issue noticeable when compiling code with a large number of "and"
and "or" operators.
- Issue #21418: Fix a crash in the builtin function super() when called without
argument and without current frame (ex: embedded Python).
- Issue #21425: Fix flushing of standard streams in the interactive
interpreter.
- Issue #21435: In rare cases, when running finalizers on objects in cyclic
trash a bad pointer dereference could occur due to a subtle flaw in
internal iteration logic.
- Issue #21233: Add new C functions: PyMem_RawCalloc(), PyMem_Calloc(),
PyObject_Calloc(), _PyObject_GC_Calloc(). bytes(int) and bytearray(int)
are now using ``calloc()`` instead of ``malloc()`` for large objects which
is faster and use less memory (until the bytearray buffer is filled with
data).
- Issue #21377: PyBytes_Concat() now tries to concatenate in-place when the
first argument has a reference count of 1. Patch by Nikolaus Rath.
- Issue #20355: -W command line options now have higher priority than the
PYTHONWARNINGS environment variable. Patch by Arfrever.
- Issue #21274: Define PATH_MAX for GNU/Hurd in Python/pythonrun.c.
- Issue #20904: Support setting FPU precision on m68k.
- Issue #21209: Fix sending tuples to custom generator objects with the yield
from syntax.
- Issue #21193: pow(a, b, c) now raises ValueError rather than TypeError when b
is negative. Patch by Josh Rosenberg.
- PEP 465 and Issue #21176: Add the '@' operator for matrix multiplication.
- Issue #21134: Fix segfault when str is called on an uninitialized
UnicodeEncodeError, UnicodeDecodeError, or UnicodeTranslateError object.
- Issue #19537: Fix PyUnicode_DATA() alignment under m68k. Patch by
Andreas Schwab.
- Issue #20929: Add a type cast to avoid shifting a negative number.
- Issue #20731: Properly position in source code files even if they
are opened in text mode. Patch by Serhiy Storchaka.
- Issue #20637: Key-sharing now also works for instance dictionaries of
subclasses. Patch by Peter Ingebretson.
- Issue #8297: Attributes missing from modules now include the module name
in the error text. Original patch by ysj.ray.
- Issue #19995: %c, %o, %x, and %X now raise TypeError on non-integer input.
- Issue #19655: The ASDL parser - used by the build process to generate code for
managing the Python AST in C - was rewritten. The new parser is self contained
and does not require to carry long the spark.py parser-generator library;
spark.py was removed from the source base.
- Issue #12546: Allow \x00 to be used as a fill character when using str, int,
float, and complex __format__ methods.
- Issue #20480: Add ipaddress.reverse_pointer. Patch by Leon Weber.
- Issue #13598: Modify string.Formatter to support auto-numbering of
replacement fields. It now matches the behavior of str.format() in
this regard. Patches by Phil Elson and Ramchandra Apte.
- Issue #8931: Make alternate formatting ('#') for type 'c' raise an
exception. In versions prior to 3.5, '#' with 'c' had no effect. Now
specifying it is an error. Patch by Torsten Landschoff.
Library
-------
- Issue #21455: Add a default backlog to socket.listen().
- Issue #21525: Most Tkinter methods which accepted tuples now accept lists too.
- Issue #10744: Fix PEP 3118 format strings on ctypes objects with a nontrivial
shape.
- Issue #20826: Optimize ipaddress.collapse_addresses().
- Issue #21487: Optimize ipaddress.summarize_address_range() and
ipaddress.{IPv4Network,IPv6Network}.subnets().
- Issue #21486: Optimize parsing of netmasks in ipaddress.IPv4Network and
ipaddress.IPv6Network.
- Issue #13916: Disallowed the surrogatepass error handler for non UTF-*
encodings.
- Issue #20998: Fixed re.fullmatch() of repeated single character pattern
with ignore case. Original patch by Matthew Barnett.
- Issue #21075: fileinput.FileInput now reads bytes from standard stream if
binary mode is specified. Patch by Sam Kimbrel.
- Issue #19775: Add a samefile() method to pathlib Path objects. Initial
patch by Vajrasky Kok.
- Issue #21398: Fix an unicode error in the pydoc pager when the documentation
contains characters not encodable to the stdout encoding.
- Issue #16531: ipaddress.IPv4Network and ipaddress.IPv6Network now accept
an (address, netmask) tuple argument, so as to easily construct network
objects from existing addresses.
- Issue #21156: importlib.abc.InspectLoader.source_to_code() is now a
staticmethod.
- Issue #21424: Simplified and optimized heaqp.nlargest() and nmsmallest()
to make fewer tuple comparisons.
- Issue #21396: Fix TextIOWrapper(..., write_through=True) to not force a
flush() on the underlying binary stream. Patch by akira.
- Issue #18314: Unlink now removes junctions on Windows. Patch by Kim Gräsman
- Issue #21088: Bugfix for curses.window.addch() regression in 3.4.0.
In porting to Argument Clinic, the first two arguments were reversed.
- Issue #10650: Remove the non-standard 'watchexp' parameter from the
Decimal.quantize() method in the Python version. It had never been
present in the C version.
- Issue #21469: Reduced the risk of false positives in robotparser by
checking to make sure that robots.txt has been read or does not exist
prior to returning True in can_fetch().
- Issue #19414: Have the OrderedDict mark deleted links as unusable.
This gives an early failure if the link is deleted during iteration.
- Issue #21421: Add __slots__ to the MappingViews ABC.
Patch by Josh Rosenberg.
- Issue #21101: Eliminate double hashing in the C speed-up code for
collections.Counter().
- Issue #21321: itertools.islice() now releases the reference to the source
iterator when the slice is exhausted. Patch by Anton Afanasyev.
- Issue #21057: TextIOWrapper now allows the underlying binary stream's
read() or read1() method to return an arbitrary bytes-like object
(such as a memoryview). Patch by Nikolaus Rath.
- Issue #20951: SSLSocket.send() now raises either SSLWantReadError or
SSLWantWriteError on a non-blocking socket if the operation would block.
Previously, it would return 0. Patch by Nikolaus Rath.
- Issue #13248: removed previously deprecated asyncore.dispatcher __getattr__
cheap inheritance hack.
- Issue #9815: assertRaises now tries to clear references to local variables
in the exception's traceback.
- Issue #19940: ssl.cert_time_to_seconds() now interprets the given time
string in the UTC timezone (as specified in RFC 5280), not the local
timezone.
- Issue #13204: Calling sys.flags.__new__ would crash the interpreter,
now it raises a TypeError.
- Issue #19385: Make operations on a closed dbm.dumb database always raise the
same exception.
- Issue #21207: Detect when the os.urandom cached fd has been closed or
replaced, and open it anew.
- Issue #21291: subprocess's Popen.wait() is now thread safe so that
multiple threads may be calling wait() or poll() on a Popen instance
at the same time without losing the Popen.returncode value.
- Issue #21127: Path objects can now be instantiated from str subclass
instances (such as ``numpy.str_``).
- Issue #15002: urllib.response object to use _TemporaryFileWrapper (and
_TemporaryFileCloser) facility. Provides a better way to handle file
descriptor close. Patch contributed by Christian Theune.
- Issue #12220: mindom now raises a custom ValueError indicating it doesn't
support spaces in URIs instead of letting a 'split' ValueError bubble up.
- Issue #21068: The ssl.PROTOCOL* constants are now enum members.
- Issue #21262: New method assert_not_called for Mock.
It raises AssertionError if the mock has been called.
- Issue #21238: New keyword argument `unsafe` to Mock. It raises
`AttributeError` incase of an attribute startswith assert or assret.
- Issue #20896: ssl.get_server_certificate() now uses PROTOCOL_SSLv23, not
PROTOCOL_SSLv3, for maximum compatibility.
- Issue #21239: patch.stopall() didn't work deterministically when the same
name was patched more than once.
- Issue #21203: Updated fileConfig and dictConfig to remove inconsistencies.
Thanks to Jure Koren for the patch.
- Issue #21222: Passing name keyword argument to mock.create_autospec now
works.
- Issue #21197: Add lib64 -> lib symlink in venvs on 64-bit non-OS X POSIX.
- Issue #17498: Some SMTP servers disconnect after certain errors, violating
strict RFC conformance. Instead of losing the error code when we issue the
subsequent RSET, smtplib now returns the error code and defers raising the
SMTPServerDisconnected error until the next command is issued.
- Issue #17826: setting an iterable side_effect on a mock function created by
create_autospec now works. Patch by Kushal Das.
- Issue #7776: Fix ``Host:`` header and reconnection when using
http.client.HTTPConnection.set_tunnel(). Patch by Nikolaus Rath.
- Issue #20968: unittest.mock.MagicMock now supports division.
Patch by Johannes Baiter.
- Fix arbitrary memory access in JSONDecoder.raw_decode with a negative second
parameter. Bug reported by Guido Vranken.
- Issue #21169: getpass now handles non-ascii characters that the
input stream encoding cannot encode by re-encoding using the
replace error handler.
- Issue #21171: Fixed undocumented filter API of the rot13 codec.
Patch by Berker Peksag.
- Issue #20539: Improved math.factorial error message for large positive inputs
and changed exception type (OverflowError -> ValueError) for large negative
inputs.
- Issue #21172: isinstance check relaxed from dict to collections.Mapping.
- Issue #21155: asyncio.EventLoop.create_unix_server() now raises a ValueError
if path and sock are specified at the same time.
- Issue #21136: Avoid unnecessary normalization of Fractions resulting from
power and other operations. Patch by Raymond Hettinger.
- Issue #17621: Introduce importlib.util.LazyLoader.
- Issue #21076: signal module constants were turned into enums.
Patch by Giampaolo Rodola'.
- Issue #20636: Improved the repr of Tkinter widgets.
- Issue #19505: The items, keys, and values views of OrderedDict now support
reverse iteration using reversed().
- Issue #21149: Improved thread-safety in logging cleanup during interpreter
shutdown. Thanks to Devin Jeanpierre for the patch.
- Issue #21058: Fix a leak of file descriptor in
:func:`tempfile.NamedTemporaryFile`, close the file descriptor if
:func:`io.open` fails
- Issue #21200: Return None from pkgutil.get_loader() when __spec__ is missing.
- Issue #21013: Enhance ssl.create_default_context() when used for server side
sockets to provide better security by default.
- Issue #20145: `assertRaisesRegex` and `assertWarnsRegex` now raise a
TypeError if the second argument is not a string or compiled regex.
- Issue #20633: Replace relative import by absolute import.
- Issue #20980: Stop wrapping exception when using ThreadPool.
- Issue #21082: In os.makedirs, do not set the process-wide umask. Note this
changes behavior of makedirs when exist_ok=True.
- Issue #20990: Fix issues found by pyflakes for multiprocessing.
- Issue #21015: SSL contexts will now automatically select an elliptic
curve for ECDH key exchange on OpenSSL 1.0.2 and later, and otherwise
default to "prime256v1".
- Issue #21000: Improve the command-line interface of json.tool.
- Issue #20995: Enhance default ciphers used by the ssl module to enable
better security an prioritize perfect forward secrecy.
- Issue #20884: Don't assume that __file__ is defined on importlib.__init__.
- Issue #21499: Ignore __builtins__ in several test_importlib.test_api tests.
- Issue #20627: xmlrpc.client.ServerProxy is now a context manager.
- Issue #19165: The formatter module now raises DeprecationWarning instead of
PendingDeprecationWarning.
- Issue #13936: Remove the ability of datetime.time instances to be considered
false in boolean contexts.
- Issue 18931: selectors module now supports /dev/poll on Solaris.
Patch by Giampaolo Rodola'.
- Issue #19977: When the ``LC_TYPE`` locale is the POSIX locale (``C`` locale),
:py:data:`sys.stdin` and :py:data:`sys.stdout` are now using the
``surrogateescape`` error handler, instead of the ``strict`` error handler.
- Issue #20574: Implement incremental decoder for cp65001 code (Windows code
page 65001, Microsoft UTF-8).
- Issue #20879: Delay the initialization of encoding and decoding tables for
base32, ascii85 and base85 codecs in the base64 module, and delay the
initialization of the unquote_to_bytes() table of the urllib.parse module, to
not waste memory if these modules are not used.
- Issue #19157: Include the broadcast address in the usuable hosts for IPv6
in ipaddress.
- Issue #11599: When an external command (e.g. compiler) fails, distutils now
prints out the whole command line (instead of just the command name) if the
environment variable DISTUTILS_DEBUG is set.
- Issue #4931: distutils should not produce unhelpful "error: None" messages
anymore. distutils.util.grok_environment_error is kept but doc-deprecated.
- Issue #20875: Prevent possible gzip "'read' is not defined" NameError.
Patch by Claudiu Popa.
- Issue #11558: ``email.message.Message.attach`` now returns a more
useful error message if ``attach`` is called on a message for which
``is_multipart`` is False.
- Issue #20283: RE pattern methods now accept the string keyword parameters
as documented. The pattern and source keyword parameters are left as
deprecated aliases.
- Issue #20778: Fix modulefinder to work with bytecode-only modules.
- Issue #20791: copy.copy() now doesn't make a copy when the input is
a bytes object. Initial patch by Peter Otten.
- Issue #19748: On AIX, time.mktime() now raises an OverflowError for year
outsize range [1902; 2037].
- Issue #19573: inspect.signature: Use enum for parameter kind constants.
- Issue #20726: inspect.signature: Make Signature and Parameter picklable.
- Issue #17373: Add inspect.Signature.from_callable method.
- Issue #20378: Improve repr of inspect.Signature and inspect.Parameter.
- Issue #20816: Fix inspect.getcallargs() to raise correct TypeError for
missing keyword-only arguments. Patch by Jeremiah Lowin.
- Issue #20817: Fix inspect.getcallargs() to fail correctly if more
than 3 arguments are missing. Patch by Jeremiah Lowin.
- Issue #6676: Ensure a meaningful exception is raised when attempting
to parse more than one XML document per pyexpat xmlparser instance.
(Original patches by Hirokazu Yamamoto and Amaury Forgeot d'Arc, with
suggested wording by David Gutteridge)
- Issue #21117: Fix inspect.signature to better support functools.partial.
Due to the specifics of functools.partial implementation,
positional-or-keyword arguments passed as keyword arguments become
keyword-only.
- Issue #20334: inspect.Signature and inspect.Parameter are now hashable.
- Issue #15916: doctest.DocTestSuite returns an empty unittest.TestSuite instead
of raising ValueError if it finds no tests
- Issue #21209: Fix asyncio.tasks.CoroWrapper to workaround a bug
in yield-from implementation in CPythons prior to 3.4.1.
- asyncio: Add gi_{frame,running,code} properties to CoroWrapper
(upstream issue #163).
- Issue #21311: Avoid exception in _osx_support with non-standard compiler
configurations. Patch by John Szakmeister.
- Issue #11571: Ensure that the turtle window becomes the topmost window
when launched on OS X.
Extension Modules
-----------------
- Issue #21407: _decimal: The module now supports function signatures.
- Issue #21276: posixmodule: Don't define USE_XATTRS on KFreeBSD and the Hurd.
- Issue #21226: Set up modules properly in PyImport_ExecCodeModuleObject
(and friends).
IDLE
----
- Issue #18104: Add idlelib/idle_test/htest.py with a few sample tests to begin
consolidating and improving human-validated tests of Idle. Change other files
as needed to work with htest. Running the module as __main__ runs all tests.
- Issue #21139: Change default paragraph width to 72, the PEP 8 recommendation.
- Issue #21284: Paragraph reformat test passes after user changes reformat width.
- Issue #17654: Ensure IDLE menus are customized properly on OS X for
non-framework builds and for all variants of Tk.
Build
-----
- Issue #21141: The Windows build process no longer attempts to find Perl,
instead relying on OpenSSL source being configured and ready to build. The
``PCbuild\build_ssl.py`` script has been re-written and re-named to
``PCbuild\prepare_ssl.py``, and takes care of configuring OpenSSL source
for both 32 and 64 bit platforms. OpenSSL sources obtained from
svn.python.org will always be pre-configured and ready to build.
- Issue #21037: Add a build option to enable AddressSanitizer support.
- The Windows build now includes OpenSSL 1.0.1g
- Issue #19962: The Windows build process now creates "python.bat" in the
root of the source tree, which passes all arguments through to the most
recently built interpreter.
- Issue #21285: Refactor and fix curses configure check to always search
in a ncursesw directory.
- Issue #15234: For BerkelyDB and Sqlite, only add the found library and
include directories if they aren't already being searched. This avoids
an explicit runtime library dependency.
- Issue #17861: Tools/scripts/generate_opcode_h.py automatically regenerates
Include/opcode.h from Lib/opcode.py if the later gets any change.
- Issue #20644: OS X installer build support for documentation build changes
in 3.4.1: assume externally supplied sphinx-build is available in /usr/bin.
- Issue #20022: Eliminate use of deprecated bundlebuilder in OS X builds.
- Issue #15968: Incorporated Tcl, Tk, and Tix builds into the Windows build
solution.
C API
-----
- Issue #20942: PyImport_ImportFrozenModuleObject() no longer sets __file__ to
match what importlib does; this affects _frozen_importlib as well as any
module loaded using imp.init_frozen().
Documentation
-------------
- Issue #17386: Expanded functionality of the ``Doc/make.bat`` script to make
it much more comparable to ``Doc/Makefile``.
- Issue #21312: Update the thread_foobar.h template file to include newer
threading APIs. Patch by Jack McCracken.
- Issue #21043: Remove the recommendation for specific CA organizations and to
mention the ability to load the OS certificates.
- Issue #20765: Add missing documentation for PurePath.with_name() and
PurePath.with_suffix().
- Issue #19407: New package installation and distribution guides based on
the Python Packaging Authority tools. Existing guides have been retained
as legacy links from the distutils docs, as they still contain some
required reference material for tool developers that isn't recorded
anywhere else.
- Issue #19697: Document cases where __main__.__spec__ is None.
Tests
-----
- Issue #17756: Fix test_code test when run from the installed location.
- Issue #17752: Fix distutils tests when run from the installed location.
- Issue #18604: Consolidated checks for GUI availability. All platforms now
at least check whether Tk can be instantiated when the GUI resource is
requested.
- Issue #21275: Fix a socket test on KFreeBSD.
- Issue #21223: Pass test_site/test_startup_imports when some of the extensions
are built as builtins.
- Issue #20635: Added tests for Tk geometry managers.
- Add test case for freeze.
- Issue #20743: Fix a reference leak in test_tcl.
- Issue #21097: Move test_namespace_pkgs into test_importlib.
- Issue #21503: Use test_both() consistently in test_importlib.
- Issue #20939: Avoid various network test failures due to new
redirect of http://www.python.org/ to https://www.python.org:
use http://www.example.com instead.
- Issue #20668: asyncio tests no longer rely on tests.txt file.
(Patch by Vajrasky Kok)
- Issue #21093: Prevent failures of ctypes test_macholib on OS X if a
copy of libz exists in $HOME/lib or /usr/local/lib.
Tools/Demos
-----------
- Add support for ``yield from`` to 2to3.
- Add support for the PEP 465 matrix multiplication operator to 2to3.
- Issue #16047: Fix module exception list and __file__ handling in freeze.
Patch by Meador Inge.
- Issue #11824: Consider ABI tags in freeze. Patch by Meador Inge.
- Issue #20535: PYTHONWARNING no longer affects the run_tests.py script.
Patch by Arfrever Frehtes Taifersar Arahesis.
What's New in Python 3.4.0?
===========================
Release date: 2014-03-16
Library
-------
- Issue #20939: Fix test_geturl failure in test_urllibnet due to
new redirect of http://www.python.org/ to https://www.python.org.
Documentation
-------------
- Merge in all documentation changes since branching 3.4.0rc1.
What's New in Python 3.4.0 release candidate 3?
===============================================
Release date: 2014-03-09
Core and Builtins
-----------------
- Issue #20786: Fix signatures for dict.__delitem__ and
property.__delete__ builtins.
Library
-------
- Issue #20839: Don't trigger a DeprecationWarning in the still supported
pkgutil.get_loader() API when __loader__ isn't set on a module (nor
when pkgutil.find_loader() is called directly).
Build
-----
- Issue #14512: Launch pydoc -b instead of pydocgui.pyw on Windows.
- Issue #20748: Uninstalling pip does not leave behind the pyc of
the uninstaller anymore.
- Issue #20568: The Windows installer now installs the unversioned ``pip``
command in addition to the versioned ``pip3`` and ``pip3.4`` commands.
- Issue #20757: The ensurepip helper for the Windows uninstaller now skips
uninstalling pip (rather than failing) if the user has updated pip to a
different version from the one bundled with ensurepip.
- Issue #20465: Update OS X and Windows installer builds to use
SQLite 3.8.3.1.
What's New in Python 3.4.0 release candidate 2?
===============================================
Release date: 2014-02-23
Core and Builtins
-----------------
- Issue #20625: Parameter names in __annotations__ were not mangled properly.
Discovered by Jonas Wielicki, patch by Yury Selivanov.
- Issue #20261: In pickle, lookup __getnewargs__ and __getnewargs_ex__ on the
type of the object.
- Issue #20619: Give the AST nodes of keyword-only arguments a column and line
number.
- Issue #20526: Revert changes of issue #19466 which introduces a regression:
don't clear anymore the state of Python threads early during the Python
shutdown.
Library
-------
- Issue #20710: The pydoc summary line no longer displays the "self" parameter
for bound methods.
- Issue #20566: Change asyncio.as_completed() to use a Queue, to
avoid O(N**2) behavior.
- Issue #20704: Implement new debug API in asyncio. Add new methods
BaseEventLoop.set_debug() and BaseEventLoop.get_debug().
Add support for setting 'asyncio.tasks._DEBUG' variable with
'PYTHONASYNCIODEBUG' environment variable.
- asyncio: Refactoring and fixes: BaseEventLoop.sock_connect() raises an
error if the address is not resolved; use __slots__ in Handle and
TimerHandle; as_completed() and wait() raise TypeError if the passed
list of Futures is a single Future; call_soon() and other 'call_*()'
functions raise TypeError if the passed callback is a coroutine
function; _ProactorBasePipeTransport uses _FlowControlMixin;
WriteTransport.set_write_buffer_size() calls _maybe_pause_protocol()
to consider pausing receiving if the watermark limits have changed;
fix _check_resolved_address() for IPv6 address; and other minor
improvements, along with multiple documentation updates.
- Issue #20684: Fix inspect.getfullargspec() to not to follow __wrapped__
chains. Make its behaviour consistent with bound methods first argument.
Patch by Nick Coghlan and Yury Selivanov.
- Issue #20681: Add new error handling API in asyncio. New APIs:
loop.set_exception_handler(), loop.default_exception_handler(), and
loop.call_exception_handler().
- Issue #20673: Implement support for UNIX Domain Sockets in asyncio.
New APIs: loop.create_unix_connection(), loop.create_unix_server(),
streams.open_unix_connection(), and streams.start_unix_server().
- Issue #20616: Add a format() method to tracemalloc.Traceback.
- Issue #19744: the ensurepip installation step now just prints a warning to
stderr rather than failing outright if SSL/TLS is unavailable. This allows
local installation of POSIX builds without SSL/TLS support.
- Issue #20594: Avoid name clash with the libc function posix_close.
Build
-----
- Issue #20641: Run MSI custom actions (pip installation, pyc compilation)
with the NoImpersonate flag, to support elevated execution (UAC).
- Issue #20221: Removed conflicting (or circular) hypot definition when
compiled with VS 2010 or above. Initial patch by Tabrez Mohammed.
- Issue #20609: Restored the ability to build 64-bit Windows binaries on
32-bit Windows, which was broken by the change in issue #19788.
What's New in Python 3.4.0 release candidate 1?
===============================================
Release date: 2014-02-10
Core and Builtins
-----------------
- Issue #19255: The builtins module is restored to initial value before
cleaning other modules. The sys and builtins modules are cleaned last.
- Issue #20588: Make Python-ast.c C89 compliant.
- Issue #20437: Fixed 22 potential bugs when deleting objects references.
- Issue #20500: Displaying an exception at interpreter shutdown no longer
risks triggering an assertion failure in PyObject_Str.
- Issue #20538: UTF-7 incremental decoder produced inconsistent string when
input was truncated in BASE64 section.
- Issue #20404: io.TextIOWrapper (and hence the open() builtin) now uses the
internal codec marking system added for issue #19619 to throw LookupError
for known non-text encodings at stream construction time. The existing
output type checks remain in place to deal with unmarked third party
codecs.
- Issue #17162: Add PyType_GetSlot.
- Issue #20162: Fix an alignment issue in the siphash24() hash function which
caused a crash on PowerPC 64-bit (ppc64).
Library
-------
- Issue #20530: The signatures for slot builtins have been updated
to reflect the fact that they only accept positional-only arguments.
- Issue #20517: Functions in the os module that accept two filenames
now register both filenames in the exception on failure.
- Issue #20563: The ipaddress module API is now considered stable.
- Issue #14983: email.generator now always adds a line end after each MIME
boundary marker, instead of doing so only when there is an epilogue. This
fixes an RFC compliance bug and solves an issue with signed MIME parts.
- Issue #20540: Fix a performance regression (vs. Python 3.2) when layering
a multiprocessing Connection over a TCP socket. For small payloads, Nagle's
algorithm would introduce idle delays before the entire transmission of a
message.
- Issue #16983: the new email header parsing code will now decode encoded words
that are (incorrectly) surrounded by quotes, and register a defect.
- Issue #19772: email.generator no longer mutates the message object when
doing a down-transform from 8bit to 7bit CTEs.
- Issue #20536: the statistics module now correctly handle Decimal instances
with positive exponents
- Issue #18805: the netmask/hostmask parsing in ipaddress now more reliably
filters out illegal values and correctly allows any valid prefix length.
- Issue #20481: For at least Python 3.4, the statistics module will require
that all inputs for a single operation be of a single consistent type, or
else a mixed of ints and a single other consistent type. This avoids
some interoperability issues that arose with the previous approach of
coercing to a suitable common type.
- Issue #20478: the statistics module now treats collections.Counter inputs
like any other iterable.
- Issue #17369: get_filename was raising an exception if the filename
parameter's RFC2231 encoding was broken in certain ways. This was
a regression relative to python2.
- Issue #20013: Some imap servers disconnect if the current mailbox is
deleted, and imaplib did not handle that case gracefully. Now it
handles the 'bye' correctly.
- Issue #20531: Revert 3.4 version of fix for #19063, and apply the 3.3
version. That is, do *not* raise an error if unicode is passed to
email.message.Message.set_payload.
- Issue #20476: If a non-compat32 policy is used with any of the email parsers,
EmailMessage is now used as the factory class. The factory class should
really come from the policy; that will get fixed in 3.5.
- Issue #19920: TarFile.list() no longer fails when outputs a listing
containing non-encodable characters. Based on patch by Vajrasky Kok.
- Issue #20515: Fix NULL pointer dereference introduced by issue #20368.
- Issue #19186: Restore namespacing of expat symbols inside the pyexpat module.
- Issue #20053: ensurepip (and hence venv) are no longer affected by the
settings in the default pip configuration file.
- Issue #20426: When passing the re.DEBUG flag, re.compile() displays the
debug output every time it is called, regardless of the compilation cache.
- Issue #20368: The null character now correctly passed from Tcl to Python.
Improved error handling in variables-related commands.
- Issue #20435: Fix _pyio.StringIO.getvalue() to take into account newline
translation settings.
- tracemalloc: Fix slicing traces and fix slicing a traceback.
- Issue #20354: Fix an alignment issue in the tracemalloc module on 64-bit
platforms. Bug seen on 64-bit Linux when using "make profile-opt".
- Issue #17159: inspect.signature now accepts duck types of functions,
which adds support for Cython functions. Initial patch by Stefan Behnel.
- Issue #18801: Fix inspect.classify_class_attrs to correctly classify
object.__new__ and object.__init__.
- Fixed cmath.isinf's name in its argument parsing code.
- Issue #20311, #20452: poll and epoll now round the timeout away from zero,
instead of rounding towards zero, in select and selectors modules:
select.epoll.poll(), selectors.PollSelector.poll() and
selectors.EpollSelector.poll(). For example, a timeout of one microsecond
(1e-6) is now rounded to one millisecondi (1e-3), instead of being rounded to
zero. However, the granularity property and asyncio's resolution feature
were removed again.
- asyncio: Some refactoring; various fixes; add write flow control to
unix pipes; Future.set_exception() instantiates the exception
argument if it is a class; improved proactor pipe transport; support
wait_for(f, None); don't log broken/disconnected pipes; use
ValueError instead of assert for forbidden subprocess_{shell,exec}
arguments; added a convenience API for subprocess management; added
StreamReader.at_eof(); properly handle duplicate coroutines/futures
in gather(), wait(), as_completed(); use a bytearray for buffering
in StreamReader; and more.
- Issue #20288: fix handling of invalid numeric charrefs in HTMLParser.
- Issue #20424: Python implementation of io.StringIO now supports lone surrogates.
- Issue #20308: inspect.signature now works on classes without user-defined
__init__ or __new__ methods.
- Issue #20372: inspect.getfile (and a bunch of other inspect functions that
use it) doesn't crash with unexpected AttributeError on classes defined in C
without __module__.
- Issue #20356: inspect.signature formatting uses '/' to separate
positional-only parameters from others.
- Issue #20223: inspect.signature now supports methods defined with
functools.partialmethods.
- Issue #19456: ntpath.join() now joins relative paths correctly when a drive
is present.
- Issue #19077: tempfile.TemporaryDirectory cleanup no longer fails when
called during shutdown. Emitting resource warning in __del__ no longer fails.
Original patch by Antoine Pitrou.
- Issue #20394: Silence Coverity warning in audioop module.
- Issue #20367: Fix behavior of concurrent.futures.as_completed() for
duplicate arguments. Patch by Glenn Langford.
- Issue #8260: The read(), readline() and readlines() methods of
codecs.StreamReader returned incomplete data when were called after
readline() or read(size). Based on patch by Amaury Forgeot d'Arc.
- Issue #20105: the codec exception chaining now correctly sets the
traceback of the original exception as its __traceback__ attribute.
- Issue #17481: inspect.getfullargspec() now uses inspect.signature() API.
- Issue #15304: concurrent.futures.wait() can block forever even if
Futures have completed. Patch by Glenn Langford.
- Issue #14455: plistlib: fix serializing integers integers in the range
of an unsigned long long but outside of the range of signed long long for
binary plist files.
IDLE
----
- Issue #20406: Use Python application icons for Idle window title bars.
Patch mostly by Serhiy Storchaka.
- Update the python.gif icon for the Idle classbrowser and pathbowser
from the old green snake to the new new blue and yellow snakes.
- Issue #17721: Remove non-functional configuration dialog help button until we
make it actually gives some help when clicked. Patch by Guilherme Simões.
Tests
-----
- Issue #20532: Tests which use _testcapi now are marked as CPython only.
- Issue #19920: Added tests for TarFile.list(). Based on patch by Vajrasky Kok.
- Issue #19990: Added tests for the imghdr module. Based on patch by
Claudiu Popa.
- Issue #20474: Fix test_socket "unexpected success" failures on OS X 10.7+.
Tools/Demos
-----------
- Issue #20530: Argument Clinic's signature format has been revised again.
The new syntax is highly human readable while still preventing false
positives. The syntax also extends Python syntax to denote "self" and
positional-only parameters, allowing inspect.Signature objects to be
totally accurate for all supported builtins in Python 3.4.
- Issue #20456: Argument Clinic now observes the C preprocessor conditional
compilation statements of the C files it parses. When a Clinic block is
inside a conditional code, it adjusts its output to match, including
automatically generating an empty methoddef macro.
- Issue #20456: Cloned functions in Argument Clinic now use the correct
name, not the name of the function they were cloned from, for text
strings inside generated code.
- Issue #20456: Fixed Argument Clinic's test suite and "--converters" feature.
- Issue #20456: Argument Clinic now allows specifying different names
for a parameter in Python and C, using "as" on the parameter line.
- Issue #20326: Argument Clinic now uses a simple, unique signature to
annotate text signatures in docstrings, resulting in fewer false
positives. "self" parameters are also explicitly marked, allowing
inspect.Signature() to authoritatively detect (and skip) said parameters.
- Issue #20326: Argument Clinic now generates separate checksums for the
input and output sections of the block, allowing external tools to verify
that the input has not changed (and thus the output is not out-of-date).
Build
-----
- Issue #20465: Update SQLite shipped with OS X installer to 3.8.3.
C-API
-----
- Issue #20517: Added new functions allowing OSError exceptions to reference
two filenames instead of one: PyErr_SetFromErrnoWithFilenameObjects() and
PyErr_SetExcFromWindowsErrWithFilenameObjects().
Documentation
-------------
- Issue #20488: Change wording to say importlib is *the* implementation of
import instead of just *an* implementation.
- Issue #6386: Clarify in the tutorial that specifying a symlink to execute
means the directory containing the executed script and not the symlink is
added to sys.path.
What's New in Python 3.4.0 Beta 3?
==================================
Release date: 2014-01-26
Core and Builtins
-----------------
- Issue #20189: Four additional builtin types (PyTypeObject,
PyMethodDescr_Type, _PyMethodWrapper_Type, and PyWrapperDescr_Type)
have been modified to provide introspection information for builtins.
- Issue #17825: Cursor "^" is correctly positioned for SyntaxError and
IndentationError.
- Issue #2382: SyntaxError cursor "^" is now written at correct position in most
cases when multibyte characters are in line (before "^"). This still not
works correctly with wide East Asian characters.
- Issue #18960: The first line of Python script could be executed twice when
the source encoding was specified on the second line. Now the source encoding
declaration on the second line isn't effective if the first line contains
anything except a comment. 'python -x' works now again with files with the
source encoding declarations, and can be used to make Python batch files
on Windows.
Library
-------
- asyncio: Various improvements and small changes not all covered by
issues listed below. E.g. wait_for() now cancels the inner task if
the timeout occcurs; tweaked the set of exported symbols; renamed
Empty/Full to QueueEmpty/QueueFull; "with (yield from lock)" now
uses a separate context manager; readexactly() raises if not enough
data was read; PTY support tweaks.
- Issue #20311: asyncio: Add a granularity attribute to BaseEventLoop: maximum
between the resolution of the BaseEventLoop.time() method and the resolution
of the selector. The granuarility is used in the scheduler to round time and
deadline.
- Issue #20311: selectors: Add a resolution attribute to BaseSelector.
- Issue #20189: unittest.mock now no longer assumes that any object for
which it could get an inspect.Signature is a callable written in Python.
Fix courtesy of Michael Foord.
- Issue #20317: ExitStack.__exit__ could create a self-referential loop if an
exception raised by a cleanup operation already had its context set
correctly (for example, by the @contextmanager decorator). The infinite
loop this caused is now avoided by checking if the expected context is
already set before trying to fix it.
- Issue #20374: Fix build with GNU readline >= 6.3.
- Issue #20262: Warnings are raised now when duplicate names are added in the
ZIP file or too long ZIP file comment is truncated.
- Issue #20165: The unittest module no longer considers tests marked with
@expectedFailure successful if they pass.
- Issue #18574: Added missing newline in 100-Continue reply from
http.server.BaseHTTPRequestHandler. Patch by Nikolaus Rath.
- Issue #20270: urllib.urlparse now supports empty ports.
- Issue #20243: TarFile no longer raise ReadError when opened in write mode.
- Issue #20238: TarFile opened with external fileobj and "w:gz" mode didn't
write complete output on close.
- Issue #20245: The open functions in the tarfile module now correctly handle
empty mode.
- Issue #20242: Fixed basicConfig() format strings for the alternative
formatting styles. Thanks to kespindler for the bug report and patch.
- Issue #20246: Fix buffer overflow in socket.recvfrom_into.
- Issues #20206 and #5803: Fix edge case in email.quoprimime.encode where it
truncated lines ending in a character needing encoding but no newline by
using a more efficient algorithm that doesn't have the bug.
- Issue #19082: Working xmlrpc.server and xmlrpc.client examples. Both in
modules and in documentation. Initial patch contributed by Vajrasky Kok.
- Issue #20138: The wsgiref.application_uri() and wsgiref.request_uri()
functions now conform to PEP 3333 when handle non-ASCII URLs.
- Issue #19097: Raise the correct Exception when cgi.FieldStorage is given an
invalid fileobj.
- Issue #20152: Ported Python/import.c over to Argument Clinic.
- Issue #13107: argparse and optparse no longer raises an exception when output
a help on environment with too small COLUMNS. Based on patch by
Elazar Gershuni.
- Issue #20207: Always disable SSLv2 except when PROTOCOL_SSLv2 is explicitly
asked for.
- Issue #18960: The tokenize module now ignore the source encoding declaration
on the second line if the first line contains anything except a comment.
- Issue #20078: Reading malformed zipfiles no longer hangs with 100% CPU
consumption.
- Issue #20113: os.readv() and os.writev() now raise an OSError exception on
error instead of returning -1.
- Issue #19719: Make importlib.abc.MetaPathFinder.find_module(),
PathEntryFinder.find_loader(), and Loader.load_module() use PEP 451 APIs to
help with backwards-compatibility.
- Issue #20144: inspect.Signature now supports parsing simple symbolic
constants as parameter default values in __text_signature__.
- Issue #20072: Fixed multiple errors in tkinter with wantobjects is False.
- Issue #20229: Avoid plistlib deprecation warning in platform.mac_ver().
- Issue #14455: Fix some problems with the new binary plist support in plistlib.
IDLE
----
- Issue #17390: Add Python version to Idle editor window title bar.
Original patches by Edmond Burnett and Kent Johnson.
- Issue #18960: IDLE now ignores the source encoding declaration on the second
line if the first line contains anything except a comment.
Tests
-----
- Issue #20358: Tests for curses.window.overlay and curses.window.overwrite
no longer specify min{row,col} > max{row,col}.
- Issue #19804: The test_find_mac test in test_uuid is now skipped if the
ifconfig executable is not available.
- Issue #19886: Use better estimated memory requirements for bigmem tests.
Tools/Demos
-----------
- Issue #20390: Argument Clinic's "file" output preset now defaults to
"{dirname}/clinic/{basename}.h".
- Issue #20390: Argument Clinic's "class" directive syntax has been extended
with two new required arguments: "typedef" and "type_object".
- Issue #20390: Argument Clinic: If __new__ or __init__ functions didn't use
kwargs (or args), the PyArg_NoKeywords (or PyArg_NoPositional) calls
generated are only run when the type object is an exact match.
- Issue #20390: Argument Clinic now fails if you have required parameters after
optional parameters.
- Issue #20390: Argument Clinic converters now have a new template they can
inject code into: "modifiers". Code put there is run in the parsing
function after argument parsing but before the call to the impl.
- Issue #20376: Argument Clinic now escapes backslashes in docstrings.
- Issue #20381: Argument Clinic now sanity checks the default argument when
c_default is also specified, providing a nice failure message for
disallowed values.
- Issue #20189: Argument Clinic now ensures that parser functions for
__new__ are always of type newfunc, the type of the tp_new slot.
Similarly, parser functions for __init__ are now always of type initproc,
the type of tp_init.
- Issue #20189: Argument Clinic now suppresses the docstring for __new__
and __init__ functions if no docstring is provided in the input.
- Issue #20189: Argument Clinic now suppresses the "self" parameter in the
impl for @staticmethod functions.
- Issue #20294: Argument Clinic now supports argument parsing for __new__ and
__init__ functions.
- Issue #20299: Argument Clinic custom converters may now change the default
value of c_default and py_default with a class member.
- Issue #20287: Argument Clinic's output is now configurable, allowing
delaying its output or even redirecting it to a separate file.
- Issue #20226: Argument Clinic now permits simple expressions
(e.g. "sys.maxsize - 1") as default values for parameters.
- Issue #19936: Added executable bits or shebang lines to Python scripts which
requires them. Disable executable bits and shebang lines in test and
benchmark files in order to prevent using a random system python, and in
source files of modules which don't provide command line interface. Fixed
shebang lines in the unittestgui and checkpip scripts.
- Issue #20268: Argument Clinic now supports cloning the parameters and
return converter of existing functions.
- Issue #20228: Argument Clinic now has special support for class special
methods.
- Issue #20214: Fixed a number of small issues and documentation errors in
Argument Clinic (see issue for details).
- Issue #20196: Fixed a bug where Argument Clinic did not generate correct
parsing code for functions with positional-only parameters where all arguments
are optional.
- Issue #18960: 2to3 and the findnocoding.py script now ignore the source
encoding declaration on the second line if the first line contains anything
except a comment.
- Issue #19723: The marker comments Argument Clinic uses have been changed
to improve readability.
- Issue #20157: When Argument Clinic renames a parameter because its name
collides with a C keyword, it no longer exposes that rename to PyArg_Parse.
- Issue #20141: Improved Argument Clinic's support for the PyArg_Parse "O!"
format unit.
- Issue #20144: Argument Clinic now supports simple symbolic constants
as parameter default values.
- Issue #20143: The line numbers reported in Argument Clinic errors are
now more accurate.
- Issue #20142: Py_buffer variables generated by Argument Clinic are now
initialized with a default value.
Build
-----
- Issue #12837: Silence a tautological comparison warning on OS X under Clang in
socketmodule.c.
What's New in Python 3.4.0 Beta 2?
==================================
Release date: 2014-01-05
Core and Builtins
-----------------
- Issue #17432: Drop UCS2 from names of Unicode functions in python3.def.
- Issue #19526: Exclude all new API from the stable ABI. Exceptions can be
made if a need is demonstrated.
- Issue #19969: PyBytes_FromFormatV() now raises an OverflowError if "%c"
argument is not in range [0; 255].
- Issue #19995: %c, %o, %x, and %X now issue a DeprecationWarning on non-integer
input; reworded docs to clarify that an integer type should define both __int__
and __index__.
- Issue #19787: PyThread_set_key_value() now always set the value. In Python
3.3, the function did nothing if the key already exists (if the current value
is a non-NULL pointer).
- Issue #14432: Remove the thread state field from the frame structure. Fix a
crash when a generator is created in a C thread that is destroyed while the
generator is still used. The issue was that a generator contains a frame, and
the frame kept a reference to the Python state of the destroyed C thread. The
crash occurs when a trace function is setup.
- Issue #19576: PyGILState_Ensure() now initializes threads. At startup, Python
has no concrete GIL. If PyGILState_Ensure() is called from a new thread for
the first time and PyEval_InitThreads() was not called yet, a GIL needs to be
created.
- Issue #17576: Deprecation warning emitted now when __int__() or __index__()
return not int instance.
- Issue #19932: Fix typo in import.h, missing whitespaces in function prototypes.
- Issue #19736: Add module-level statvfs constants defined for GNU/glibc
based systems.
- Issue #20097: Fix bad use of "self" in importlib's WindowsRegistryFinder.
- Issue #19729: In str.format(), fix recursive expansion in format spec.
- Issue #19638: Fix possible crash / undefined behaviour from huge (more than 2
billion characters) input strings in _Py_dg_strtod.
Library
-------
- Issue #20154: Deadlock in asyncio.StreamReader.readexactly().
- Issue #16113: Remove sha3 module again.
- Issue #20111: pathlib.Path.with_suffix() now sanity checks the given suffix.
- Fix breakage in TestSuite.countTestCases() introduced by issue #11798.
- Issue #20108: Avoid parameter name clash in inspect.getcallargs().
- Issue #19918: Fix PurePath.relative_to() under Windows.
- Issue #19422: Explicitly disallow non-SOCK_STREAM sockets in the ssl
module, rather than silently let them emit clear text data.
- Issue #20046: Locale alias table no longer contains entities which can be
calculated. Generalized support of the euro modifier.
- Issue #20027: Fixed locale aliases for devanagari locales.
- Issue #20067: Tkinter variables now work when wantobjects is false.
- Issue #19020: Tkinter now uses splitlist() instead of split() in configure
methods.
- Issue #19744: ensurepip now provides a better error message when Python is
built without SSL/TLS support (pip currently requires that support to run,
even if only operating with local wheel files)
- Issue #19734: ensurepip now ignores all pip environment variables to avoid
odd behaviour based on user configuration settings
- Fix TypeError on "setup.py upload --show-response".
- Issue #20045: Fix "setup.py register --list-classifiers".
- Issue #18879: When a method is looked up on a temporary file, avoid closing
the file before the method is possibly called.
- Issue #20037: Avoid crashes when opening a text file late at interpreter
shutdown.
- Issue #19967: Thanks to the PEP 442, asyncio.Future now uses a
destructor to log uncaught exceptions, instead of the dedicated
_TracebackLogger class.
- Added a Task.current_task() class method to asyncio.
- Issue #19850: Set SA_RESTART in asyncio when registering a signal
handler to limit EINTR occurrences.
- Implemented write flow control in asyncio for proactor event loop (Windows).
- Change write buffer in asyncio use to avoid O(N**2) behavior. Make
write()/sendto() accept bytearray/memoryview.
- Issue #20034: Updated alias mapping to most recent locale.alias file
from X.org distribution using makelocalealias.py.
- Issue #5815: Fixed support for locales with modifiers. Fixed support for
locale encodings with hyphens.
- Issue #20026: Fix the sqlite module to handle correctly invalid isolation
level (wrong type).
- Issue #18829: csv.Dialect() now checks type for delimiter, escapechar and
quotechar fields. Original patch by Vajrasky Kok.
- Issue #19855: uuid.getnode() on Unix now looks on the PATH for the
executables used to find the mac address, with /sbin and /usr/sbin as
fallbacks.
- Issue #20007: HTTPResponse.read(0) no more prematurely closes connection.
Original patch by Simon Sapin.
- Issue #19946: multiprocessing now uses runpy to initialize __main__ in
child processes when necessary, allowing it to correctly handle scripts
without suffixes and submodules that use explicit relative imports or
otherwise rely on parent modules being correctly imported prior to
execution.
- Issue #19921: When Path.mkdir() is called with parents=True, any missing
parent is created with the default permissions, ignoring the mode argument
(mimicking the POSIX "mkdir -p" command).
- Issue #19887: Improve the Path.resolve() algorithm to support certain
symlink chains.
- Issue #19912: Fixed numerous bugs in ntpath.splitunc().
- Issue #19911: ntpath.splitdrive() now correctly processes the 'İ' character
(U+0130, LATIN CAPITAL LETTER I WITH DOT ABOVE).
- Issue #19532: python -m compileall with no filename/directory arguments now
respects the -f and -q flags instead of ignoring them.
- Issue #19623: Fixed writing to unseekable files in the aifc module.
- Issue #19946: multiprocessing.spawn now raises ImportError when the module to
be used as the main module cannot be imported.
- Issue #17919: select.poll.register() again works with poll.POLLNVAL on AIX.
Fixed integer overflow in the eventmask parameter.
- Issue #19063: if a Charset's body_encoding was set to None, the email
package would generate a message claiming the Content-Transfer-Encoding
was 7bit, and produce garbage output for the content. This now works.
A couple of other set_payload mishandlings of non-ASCII are also fixed.
In addition, calling set_payload with a string argument without
specifying a charset now raises an error (this is a new error in 3.4).
- Issue #15475: Add __sizeof__ implementations for itertools objects.
- Issue #19944: Fix importlib.find_spec() so it imports parents as needed
and move the function to importlib.util.
- Issue #19880: Fix a reference leak in unittest.TestCase. Explicitly break
reference cycles between frames and the _Outcome instance.
- Issue #17429: platform.linux_distribution() now decodes files from the UTF-8
encoding with the surrogateescape error handler, instead of decoding from the
locale encoding in strict mode. It fixes the function on Fedora 19 which is
probably the first major distribution release with a non-ASCII name. Patch
written by Toshio Kuratomi.
- Issue #19343: Expose FreeBSD-specific APIs in resource module. Original
patch by Koobs.
- Issue #19929: Call os.read with 32768 within subprocess.Popen.communicate
rather than 4096 for efficiency. A microbenchmark shows Linux and OS X
both using ~50% less cpu time this way.
- Issue #19506: Use a memoryview to avoid a data copy when piping data
to stdin within subprocess.Popen.communicate. 5-10% less cpu usage.
- Issue #19876: selectors unregister() no longer raises ValueError or OSError
if the FD is closed (as long as it was registered).
- Issue #19908: pathlib now joins relative Windows paths correctly when a drive
is present. Original patch by Antoine Pitrou.
- Issue #19296: Silence compiler warning in dbm_open
- Issue #6784: Strings from Python 2 can now be unpickled as bytes
objects by setting the encoding argument of Unpickler to be 'bytes'.
Initial patch by Merlijn van Deen.
- Issue #19839: Fix regression in bz2 module's handling of non-bzip2 data at
EOF, and analogous bug in lzma module.
- Issue #19881: Fix pickling bug where cpickle would emit bad pickle data for
large bytes string (i.e., with size greater than 2**32-1).
- Issue #19138: doctest's IGNORE_EXCEPTION_DETAIL now allows a match when
no exception detail exists (no colon following the exception's name, or
a colon does follow but no text follows the colon).
- Issue #19927: Add __eq__ to path-based loaders in importlib.
- Issue #19827: On UNIX, setblocking() and settimeout() methods of
socket.socket can now avoid a second syscall if the ioctl() function can be
used, or if the non-blocking flag of the socket is unchanged.
- Issue #19785: smtplib now supports SSLContext.check_hostname and server name
indication for TLS/SSL connections.
- Issue #19784: poplib now supports SSLContext.check_hostname and server name
indication for TLS/SSL connections.
- Issue #19783: nntplib now supports SSLContext.check_hostname and server name
indication for TLS/SSL connections.
- Issue #19782: imaplib now supports SSLContext.check_hostname and server name
indication for TLS/SSL connections.
- Issue 20123: Fix pydoc.synopsis() for "binary" modules.
- Issue #19834: Support unpickling of exceptions pickled by Python 2.
- Issue #19781: ftplib now supports SSLContext.check_hostname and server name
indication for TLS/SSL connections.
- Issue #19509: Add SSLContext.check_hostname to match the peer's certificate
with server_hostname on handshake.
- Issue #15798: Fixed subprocess.Popen() to no longer fail if file
descriptor 0, 1 or 2 is closed.
- Issue #17897: Optimized unpickle prefetching.
- Issue #3693: Make the error message more helpful when the array.array()
constructor is given a str. Move the array module typecode documentation to
the docstring of the constructor.
- Issue #19088: Fixed incorrect caching of the copyreg module in
object.__reduce__() and object.__reduce_ex__().
- Issue #19698: Removed exec_module() methods from
importlib.machinery.BuiltinImporter and ExtensionFileLoader.
- Issue #18864: Added a setter for ModuleSpec.has_location.
- Fixed _pickle.Unpickler to not fail when loading empty strings as
persistent IDs.
- Issue #11480: Fixed copy.copy to work with classes with custom metaclasses.
Patch by Daniel Urban.
- Issue #6477: Added support for pickling the types of built-in singletons
(i.e., Ellipsis, NotImplemented, None).
- Issue #19713: Add remaining PEP 451-related deprecations and move away
from using find_module/find_loaer/load_module.
- Issue #19708: Update pkgutil to use the new importer APIs.
- Issue #19703: Update pydoc to use the new importer APIs.
- Issue #19851: Fixed a regression in reloading sub-modules.
- ssl.create_default_context() sets OP_NO_COMPRESSION to prevent CRIME.
- Issue #19802: Add socket.SO_PRIORITY.
- Issue #11508: Fixed uuid.getnode() and uuid.uuid1() on environment with
virtual interface. Original patch by Kent Frazier.
- Issue #11489: JSON decoder now accepts lone surrogates.
- Issue #19545: Avoid chained exceptions while passing stray % to
time.strptime(). Initial patch by Claudiu Popa.
IDLE
----
- Issue #20058: sys.stdin.readline() in IDLE now always returns only one line.
- Issue #19481: print() of string subclass instance in IDLE no longer hangs.
- Issue #18270: Prevent possible IDLE AttributeError on OS X when no initial
shell window is present.
Tests
-----
- Issue #20055: Fix test_shutil under Windows with symlink privileges held.
Patch by Vajrasky Kok.
- Issue #20070: Don't run test_urllib2net when network resources are not
enabled.
- Issue #19938: Re-enabled test_bug_1333982 in test_dis, which had been
disabled since 3.0 due to the changes in listcomp handling.
- Issue #19320: test_tcl no longer fails when wantobjects is false.
- Issue #19919: Fix flaky SSL test. connect_ex() sometimes returns
EWOULDBLOCK on Windows or VMs hosted on Windows.
- Issue #19912: Added tests for ntpath.splitunc().
- Issue #19828: Fixed test_site when the whole suite is run with -S.
- Issue #19928: Implemented a test for repr() of cell objects.
- Issue #19535: Fixed test_docxmlrpc, test_functools, test_inspect, and
test_statistics when python is run with -OO.
- Issue #19926: Removed unneeded test_main from test_abstract_numbers.
Patch by Vajrasky Kok.
- Issue #19572: More skipped tests explicitly marked as skipped.
- Issue #19595, #19987: Re-enabled a long-disabled test in test_winsound.
- Issue #19588: Fixed tests in test_random that were silently skipped most
of the time. Patch by Julian Gindi.
Build
-----
- Issue #19728: Enable pip installation by default on Windows.
- Issue #16136: Remove VMS support
- Issue #18215: Add script Tools/ssl/test_multiple_versions.py to compile and
run Python's unit tests with multiple versions of OpenSSL.
- Issue #19922: define _INCLUDE__STDC_A1_SOURCE in HP-UX to include mbstate_t
for mbrtowc().
- Issue #19788: kill_python(_d).exe is now run as a PreBuildEvent on the
pythoncore sub-project. This should prevent build errors due a previous
build's python(_d).exe still running.
Documentation
-------------
- Issue #20265: Updated some parts of the Using Windows document.
- Issue #20266: Updated some parts of the Windows FAQ.
- Issue #20255: Updated the about and bugs pages.
- Issue #20253: Fixed a typo in the ipaddress docs that advertised an
illegal attribute name. Found by INADA Naoki.
- Issue #18840: Introduce the json module in the tutorial, and de-emphasize
the pickle module.
- Issue #19845: Updated the Compiling Python on Windows section.
- Issue #19795: Improved markup of True/False constants.
Tools/Demos
-----------
- Issue #19659: Added documentation for Argument Clinic.
- Issue #19976: Argument Clinic METH_NOARGS functions now always
take two parameters.
What's New in Python 3.4.0 Beta 1?
==================================
Release date: 2013-11-24
Core and Builtins
-----------------
- Use the repr of a module name in more places in import, especially
exceptions.
- Issue #19619: str.encode, bytes.decode and bytearray.decode now use an
internal API to throw LookupError for known non-text encodings, rather
than attempting the encoding or decoding operation and then throwing a
TypeError for an unexpected output type. (The latter mechanism remains
in place for third party non-text encodings)
- Issue #19183: Implement PEP 456 'secure and interchangeable hash algorithm'.
Python now uses SipHash24 on all major platforms.
- Issue #12892: The utf-16* and utf-32* encoders no longer allow surrogate code
points (U+D800-U+DFFF) to be encoded. The utf-32* decoders no longer decode
byte sequences that correspond to surrogate code points. The surrogatepass
error handler now works with the utf-16* and utf-32* codecs. Based on
patches by Victor Stinner and Kang-Hao (Kenny) Lu.
- Issue #17806: Added keyword-argument support for "tabsize" to
str/bytes.expandtabs().
- Issue #17828: Output type errors in str.encode(), bytes.decode() and
bytearray.decode() now direct users to codecs.encode() or codecs.decode()
as appropriate.
- Issue #17828: The interpreter now attempts to chain errors that occur in
codec processing with a replacement exception of the same type that
includes the codec name in the error message. It ensures it only does this
when the creation of the replacement exception won't lose any information.
- Issue #19466: Clear the frames of daemon threads earlier during the
Python shutdown to call objects destructors. So "unclosed file" resource
warnings are now corretly emitted for daemon threads.
- Issue #19514: Deduplicate some _Py_IDENTIFIER declarations.
Patch by Andrei Dorian Duma.
- Issue #17936: Fix O(n**2) behaviour when adding or removing many subclasses
of a given type.
- Issue #19428: zipimport now handles errors when reading truncated or invalid
ZIP archive.
- Issue #18408: Add a new PyFrame_FastToLocalsWithError() function to handle
exceptions when merging fast locals into f_locals of a frame.
PyEval_GetLocals() now raises an exception and return NULL on failure.
- Issue #19369: Optimized the usage of __length_hint__().
- Issue #18603: Ensure that PyOS_mystricmp and PyOS_mystrnicmp are in the
Python executable and not removed by the linker's optimizer.
- Issue #19306: Add extra hints to the faulthandler module's stack
dumps that these are "upside down".
Library
-------
- Issue #3158: doctest can now find doctests in functions and methods
written in C.
- Issue #13477: Added command line interface to the tarfile module.
Original patch by Berker Peksag.
- Issue #19674: inspect.signature() now produces a correct signature
for some builtins.
- Issue #19722: Added opcode.stack_effect(), which
computes the stack effect of bytecode instructions.
- Issue #19735: Implement private function ssl._create_stdlib_context() to
create SSLContext objects in Python's stdlib module. It provides a single
configuration point and makes use of SSLContext.load_default_certs().
- Issue #16203: Add re.fullmatch() function and regex.fullmatch() method,
which anchor the pattern at both ends of the string to match.
Original patch by Matthew Barnett.
- Issue #13592: Improved the repr for regular expression pattern objects.
Based on patch by Hugo Lopes Tavares.
- Issue #19641: Added the audioop.byteswap() function to convert big-endian
samples to little-endian and vice versa.
- Issue #15204: Deprecated the 'U' mode in file-like objects.
- Issue #17810: Implement PEP 3154, pickle protocol 4.
- Issue #19668: Added support for the cp1125 encoding.
- Issue #19689: Add ssl.create_default_context() factory function. It creates
a new SSLContext object with secure default settings.
- Issue #19727: os.utime(..., None) is now potentially more precise
under Windows.
- Issue #17201: ZIP64 extensions now are enabled by default. Patch by
William Mallard.
- Issue #19292: Add SSLContext.load_default_certs() to load default root CA
certificates from default stores or system stores. By default the method
loads CA certs for authentication of server certs.
- Issue #19673: Add pathlib to the stdlib as a provisional module (PEP 428).
- Issue #16596: pdb in a generator now properly skips over yield and
yield from rather than stepping out of the generator into its
caller. (This is essential for stepping through asyncio coroutines.)
- Issue #17916: Added dis.Bytecode.from_traceback() and
dis.Bytecode.current_offset to easily display "current instruction"
markers in the new disassembly API (Patch by Claudiu Popa).
- Issue #19552: venv now supports bootstrapping pip into virtual environments
- Issue #17134: Finalize interface to Windows' certificate store. Cert and
CRL enumeration are now two functions. enum_certificates() also returns
purpose flags as set of OIDs.
- Issue #19555: Restore sysconfig.get_config_var('SO'), (and the distutils
equivalent) with a DeprecationWarning pointing people at $EXT_SUFFIX.
- Issue #8813: Add SSLContext.verify_flags to change the verification flags
of the context in order to enable certification revocation list (CRL)
checks or strict X509 rules.
- Issue #18294: Fix the zlib module to make it 64-bit safe.
- Issue #19682: Fix compatibility issue with old version of OpenSSL that
was introduced by Issue #18379.
- Issue #14455: plistlib now supports binary plists and has an updated API.
- Issue #19633: Fixed writing not compressed 16- and 32-bit wave files on
big-endian platforms.
- Issue #18379: SSLSocket.getpeercert() returns CA issuer AIA fields, OCSP
and CRL distribution points.
- Issue #18138: Implement cadata argument of SSLContext.load_verify_location()
to load CA certificates and CRL from memory. It supports PEM and DER
encoded strings.
- Issue #18775: Add name and block_size attribute to HMAC object. They now
provide the same API elements as non-keyed cryptographic hash functions.
- Issue #17276: MD5 as default digestmod for HMAC is deprecated. The HMAC
module supports digestmod names, e.g. hmac.HMAC('sha1').
- Issue #19449: in csv's writerow, handle non-string keys when generating the
error message that certain keys are not in the 'fieldnames' list.
- Issue #13633: Added a new convert_charrefs keyword arg to HTMLParser that,
when True, automatically converts all character references.
- Issue #2927: Added the unescape() function to the html module.
- Issue #8402: Added the escape() function to the glob module.
- Issue #17618: Add Base85 and Ascii85 encoding/decoding to the base64 module.
- Issue #19634: time.strftime("%y") now raises a ValueError on AIX when given a
year before 1900.
- Fix test.support.bind_port() to not cause an error when Python was compiled
on a system with SO_REUSEPORT defined in the headers but run on a system
with an OS kernel that does not support that reasonably new socket option.
- Fix compilation error under gcc of the ctypes module bundled libffi for arm.
- Issue #19448: Add private API to SSL module to lookup ASN.1 objects by OID,
NID, short name and long name.
- Issue #19282: dbm.open now supports the context manager protocol. (Inital
patch by Claudiu Popa)
- Issue #8311: Added support for writing any bytes-like objects in the aifc,
sunau, and wave modules.
- Issue #5202: Added support for unseekable files in the wave module.
- Issue #19544 and Issue #1180: Restore global option to ignore
~/.pydistutils.cfg in Distutils, accidentally removed in backout of
distutils2 changes.
- Issue #19523: Closed FileHandler leak which occurred when delay was set.
- Issue #19544 and Issue #6516: Restore support for --user and --group
parameters to sdist command accidentally rolled back as part of the
distutils2 rollback.
- Issue #13674: Prevented time.strftime from crashing on Windows when given
a year before 1900 and a format of %y.
- Issue #19406: implementation of the ensurepip module (part of PEP 453).
Patch by Donald Stufft and Nick Coghlan.
- Issue #19544 and Issue #6286: Restore use of urllib over http allowing use
of http_proxy for Distutils upload command, a feature accidentally lost
in the rollback of distutils2.
- Issue #19544 and Issue #7457: Restore the read_pkg_file method to
distutils.dist.DistributionMetadata accidentally removed in the undo of
distutils2.
- Issue #16685: Added support for any bytes-like objects in the audioop module.
Removed support for strings.
- Issue #7171: Add Windows implementation of ``inet_ntop`` and ``inet_pton``
to socket module. Patch by Atsuo Ishimoto.
- Issue #19261: Added support for writing 24-bit samples in the sunau module.
- Issue #1097797: Added CP273 encoding, used on IBM mainframes in
Germany and Austria. Mapping provided by Michael Bierenfeld.
- Issue #1575020: Fixed support of 24-bit wave files on big-endian platforms.
- Issue #19378: Fixed a number of cases in the dis module where the new
"file" parameter was not being honoured correctly
- Issue #19378: Removed the "dis.Bytecode.show_info" method
- Issue #19378: Renamed the "dis.Bytecode.display_code" method to
"dis.Bytecode.dis" and converted it to returning a string rather than
printing output.
- Issue #19378: the "line_offset" parameter in the new "dis.get_instructions"
API has been renamed to "first_line" (and the default value and usage
changed accordingly). This should reduce confusion with the more common use
of "offset" in the dis docs to refer to bytecode offsets.
- Issue #18678: Corrected spwd struct member names in spwd module:
sp_nam->sp_namp, and sp_pwd->sp_pwdp. The old names are kept as extra
structseq members, for backward compatibility.
- Issue #6157: Fixed tkinter.Text.debug(). tkinter.Text.bbox() now raises
TypeError instead of TclError on wrong number of arguments. Original patch
by Guilherme Polo.
- Issue #10197: Rework subprocess.get[status]output to use subprocess
functionality and thus to work on Windows. Patch by Nick Coghlan
- Issue #6160: The bbox() method of tkinter.Spinbox now returns a tuple of
integers instead of a string. Based on patch by Guilherme Polo.
- Issue #19403: contextlib.redirect_stdout is now reentrant
- Issue #19286: Directories in ``package_data`` are no longer added to
the filelist, preventing failure outlined in the ticket.
- Issue #19480: HTMLParser now accepts all valid start-tag names as defined
by the HTML5 standard.
- Issue #15114: The html.parser module now raises a DeprecationWarning when the
strict argument of HTMLParser or the HTMLParser.error method are used.
- Issue #19410: Undo the special-casing removal of '' for
importlib.machinery.FileFinder.
- Issue #19424: Fix the warnings module to accept filename containing surrogate
characters.
- Issue #19435: Fix directory traversal attack on CGIHttpRequestHandler.
- Issue #19227: Remove pthread_atfork() handler. The handler was added to
solve #18747 but has caused issues.
- Issue #19420: Fix reference leak in module initalization code of
_hashopenssl.c
- Issue #19329: Optimized compiling charsets in regular expressions.
- Issue #19227: Try to fix deadlocks caused by re-seeding then OpenSSL
pseudo-random number generator on fork().
- Issue #16037: HTTPMessage.readheaders() raises an HTTPException when more than
100 headers are read. Adapted from patch by Jyrki Pulliainen.
- Issue #16040: CVE-2013-1752: nntplib: Limit maximum line lengths to 2048 to
prevent readline() calls from consuming too much memory. Patch by Jyrki
Pulliainen.
- Issue #16041: CVE-2013-1752: poplib: Limit maximum line lengths to 2048 to
prevent readline() calls from consuming too much memory. Patch by Jyrki
Pulliainen.
- Issue #17997: Change behavior of ``ssl.match_hostname()`` to follow RFC 6125,
for security reasons. It now doesn't match multiple wildcards nor wildcards
inside IDN fragments.
- Issue #16039: CVE-2013-1752: Change use of readline in imaplib module to limit
line length. Patch by Emil Lind.
- Issue #19330: the unnecessary wrapper functions have been removed from the
implementations of the new contextlib.redirect_stdout and
contextlib.suppress context managers, which also ensures they provide
reasonable help() output on instances
- Issue #19393: Fix symtable.symtable function to not be confused when there are
functions or classes named "top".
- Issue #18685: Restore re performance to pre-PEP 393 levels.
- Issue #19339: telnetlib module is now using time.monotonic() when available
to compute timeout.
- Issue #19399: fix sporadic test_subprocess failure.
- Issue #13234: Fix os.listdir to work with extended paths on Windows.
Patch by Santoso Wijaya.
- Issue #19375: The site module adding a "site-python" directory to sys.path,
if it exists, is now deprecated.
- Issue #19379: Lazily import linecache in the warnings module, to make
startup with warnings faster until a warning gets printed.
- Issue #19288: Fixed the "in" operator of dbm.gnu databases for string
argument. Original patch by Arfrever Frehtes Taifersar Arahesis.
- Issue #19287: Fixed the "in" operator of dbm.ndbm databases for string
argument. Original patch by Arfrever Frehtes Taifersar Arahesis.
- Issue #19327: Fixed the working of regular expressions with too big charset.
- Issue #17400: New 'is_global' attribute for ipaddress to tell if an address
is allocated by IANA for global or private networks.
- Issue #19350: Increasing the test coverage of macurl2path. Patch by Colin
Williams.
- Issue #19365: Optimized the parsing of long replacement string in re.sub*()
functions.
- Issue #19352: Fix unittest discovery when a module can be reached
through several paths (e.g. under Debian/Ubuntu with virtualenv).
- Issue #15207: Fix mimetypes to read from correct part of Windows registry
Original patch by Dave Chambers
- Issue #16595: Add prlimit() to resource module.
- Issue #19324: Expose Linux-specific constants in resource module.
- Load SSL's error strings in hashlib.
- Issue #18527: Upgrade internal copy of zlib to 1.2.8.
- Issue #19274: Add a filterfunc parameter to PyZipFile.writepy.
- Issue #8964: fix platform._sys_version to handle IronPython 2.6+.
Patch by Martin Matusiak.
- Issue #19413: Restore pre-3.3 reload() semantics of re-finding modules.
- Issue #18958: Improve error message for json.load(s) while passing a string
that starts with a UTF-8 BOM.
- Issue #19307: Improve error message for json.load(s) while passing objects
of the wrong type.
- Issue #16038: CVE-2013-1752: ftplib: Limit amount of data read by
limiting the call to readline(). Original patch by Michał
Jastrzębski and Giampaolo Rodola.
- Issue #17087: Improved the repr for regular expression match objects.
Tests
-----
- Issue #19664: test_userdict's repr test no longer depends on the order
of dict elements.
- Issue #19440: Clean up test_capi by removing an unnecessary __future__
import, converting from test_main to unittest.main, and running the
_testcapi module tests as subTests of a unittest TestCase method.
- Issue #19378: the main dis module tests are now run with both stdout
redirection *and* passing an explicit file parameter
- Issue #19378: removed the not-actually-helpful assertInstructionMatches
and assertBytecodeExactlyMatches helpers from bytecode_helper
- Issue #18702: All skipped tests now reported as skipped.
- Issue #19439: interpreter embedding tests are now executed on Windows
(Patch by Zachary Ware)
- Issue #19085: Added basic tests for all tkinter widget options.
- Issue #19384: Fix test_py_compile for root user, patch by Claudiu Popa.
Documentation
-------------
- Issue #18326: Clarify that list.sort's arguments are keyword-only. Also,
attempt to reduce confusion in the glossary by not saying there are
different "types" of arguments and parameters.
Build
-----
- Issue #19358: "make clinic" now runs the Argument Clinic preprocessor
over all CPython source files.
- Update SQLite to 3.8.1, xz to 5.0.5, and Tcl/Tk to 8.6.1 on Windows.
- Issue #16632: Enable DEP and ASLR on Windows.
- Issue #17791: Drop PREFIX and EXEC_PREFIX definitions from PC/pyconfig.h
- Add workaround for VS 2010 nmake clean issue. VS 2010 doesn't set up PATH
for nmake.exe correctly.
- Issue #19550: Implement Windows installer changes of PEP 453 (ensurepip).
- Issue #19520: Fix compiler warning in the _sha3 module on 32bit Windows.
- Issue #19356: Avoid using a C variabled named "_self", it's a reserved
word in some C compilers.
- Issue #15792: Correct build options on Win64. Patch by Jeremy Kloth.
- Issue #19373: Apply upstream change to Tk 8.5.15 fixing OS X 10.9
screen refresh problem for OS X installer build.
- Issue #19649: On OS X, the same set of file names are now installed
in bin directories for all configurations: non-framework vs framework,
and single arch vs universal builds. pythonx.y-32 is now always
installed for 64-bit/32-bit universal builds. The obsolete and
undocumented pythonw* symlinks are no longer installed anywhere.
- Issue #19553: PEP 453 - "make install" and "make altinstall" now install or
upgrade pip by default, using the bundled pip provided by the new ensurepip
module. A new configure option, --with-ensurepip[=upgrade|install|no], is
available to override the default ensurepip "--upgrade" option. The option
can also be set with "make [alt]install ENSUREPIP=[upgrade|install\no]".
- Issue #19551: PEP 453 - the OS X installer now installs pip by default.
- Update third-party libraries for OS X installers: xz 5.0.3 -> 5.0.5,
SQLite 3.7.13 -> 3.8.1
- Issue #15663: Revert OS X installer built-in Tcl/Tk support for 3.4.0b1.
Some third-party projects, such as Matplotlib and PIL/Pillow,
depended on being able to build with Tcl and Tk frameworks in
/Library/Frameworks.
Tools/Demos
-----------
- Issue #19730: Argument Clinic now supports all the existing PyArg
"format units" as legacy converters, as well as two new features:
"self converters" and the "version" directive.
- Issue #19552: pyvenv now bootstraps pip into virtual environments by
default (pass --without-pip to request the old behaviour)
- Issue #19390: Argument Clinic no longer accepts malformed Python
and C ids.
What's New in Python 3.4.0 Alpha 4?
===================================
Release date: 2013-10-20
Core and Builtins
-----------------
- Issue #19301: Give classes and functions that are explicitly marked global a
global qualname.
- Issue #19279: UTF-7 decoder no longer produces illegal strings.
- Issue #16612: Add "Argument Clinic", a compile-time preprocessor for
C files to generate argument parsing code. (See PEP 436.)
- Issue #18810: Shift stat calls in importlib.machinery.FileFinder such that
the code is optimistic that if something exists in a directory named exactly
like the possible package being searched for that it's in actuality a
directory.
- Issue #18416: importlib.machinery.PathFinder now treats '' as the cwd and
importlib.machinery.FileFinder no longer special-cases '' to '.'. This leads
to modules imported from cwd to now possess an absolute file path for
__file__ (this does not affect modules specified by path on the CLI but it
does affect -m/runpy). It also allows FileFinder to be more consistent by not
having an edge case.
- Issue #4555: All exported C symbols are now prefixed with either
"Py" or "_Py".
- Issue #19219: Speed up marshal.loads(), and make pyc files slightly
(5% to 10%) smaller.
- Issue #19221: Upgrade Unicode database to version 6.3.0.
- Issue #16742: The result of the C callback PyOS_ReadlineFunctionPointer must
now be a string allocated by PyMem_RawMalloc() or PyMem_RawRealloc() (or NULL
if an error occurred), instead of a string allocated by PyMem_Malloc() or
PyMem_Realloc().
- Issue #19199: Remove ``PyThreadState.tick_counter`` field
- Fix macro expansion of _PyErr_OCCURRED(), and make sure to use it in at
least one place so as to avoid regressions.
- Issue #19087: Improve bytearray allocation in order to allow cheap popping
of data at the front (slice deletion).
- Issue #19014: memoryview.cast() is now allowed on zero-length views.
- Issue #18690: memoryview is now automatically registered with
collections.abc.Sequence
- Issue #19078: memoryview now correctly supports the reversed builtin
(Patch by Claudiu Popa)
Library
-------
- Issue #17457: unittest test discovery now works with namespace packages.
Patch by Claudiu Popa.
- Issue #18235: Fix the sysconfig variables LDSHARED and BLDSHARED under AIX.
Patch by David Edelsohn.
- Issue #18606: Add the new "statistics" module (PEP 450). Contributed
by Steven D'Aprano.
- Issue #12866: The audioop module now supports 24-bit samples.
- Issue #19254: Provide an optimized Python implementation of pbkdf2_hmac.
- Issues #19201, Issue #19222, Issue #19223: Add "x" mode (exclusive creation)
in opening file to bz2, gzip and lzma modules. Patches by Tim Heaney and
Vajrasky Kok.
- Fix a reference count leak in _sre.
- Issue #19262: Initial check in of the 'asyncio' package (a.k.a. Tulip,
a.k.a. PEP 3156). There are no docs yet, and the PEP is slightly
out of date with the code. This module will have *provisional* status
in Python 3.4.
- Issue #19276: Fixed the wave module on 64-bit big-endian platforms.
- Issue #19266: Rename the new-in-3.4 ``contextlib.ignore`` context manager
to ``contextlib.suppress`` in order to be more consistent with existing
descriptions of that operation elsewhere in the language and standard
library documentation (Patch by Zero Piraeus).
- Issue #18891: Completed the new email package (provisional) API additions
by adding new classes EmailMessage, MIMEPart, and ContentManager.
- Issue #18281: Unused stat constants removed from `tarfile`.
- Issue #18999: Multiprocessing now supports 'contexts' with the same API
as the module, but bound to specified start methods.
- Issue #18468: The re.split, re.findall, and re.sub functions and the group()
and groups() methods of match object now always return a string or a bytes
object.
- Issue #18725: The textwrap module now supports truncating multiline text.
- Issue #18776: atexit callbacks now display their full traceback when they
raise an exception.
- Issue #17827: Add the missing documentation for ``codecs.encode`` and
``codecs.decode``.
- Issue #19218: Rename collections.abc to _collections_abc in order to
speed up interpreter start.
- Issue #18582: Add 'pbkdf2_hmac' to the hashlib module. It implements PKCS#5
password-based key derivation functions with HMAC as pseudorandom function.
- Issue #19131: The aifc module now correctly reads and writes sampwidth of
compressed streams.
- Issue #19209: Remove import of copyreg from the os module to speed up
interpreter startup. stat_result and statvfs_result are now hard-coded to
reside in the os module.
- Issue #19205: Don't import the 're' module in site and sysconfig module to
to speed up interpreter start.
- Issue #9548: Add a minimal "_bootlocale" module that is imported by the
_io module instead of the full locale module.
- Issue #18764: remove the 'print' alias for the PDB 'p' command so that it no
longer shadows the print function.
- Issue #19158: a rare race in BoundedSemaphore could allow .release() too
often.
- Issue #15805: Add contextlib.redirect_stdout().
- Issue #18716: Deprecate the formatter module.
- Issue #10712: 2to3 has a new "asserts" fixer that replaces deprecated names
of unittest methods (e.g. failUnlessEqual -> assertEqual).
- Issue #18037: 2to3 now escapes '\u' and '\U' in native strings.
- Issue #17839: base64.decodebytes and base64.encodebytes now accept any
object that exports a 1 dimensional array of bytes (this means the same
is now also true for base64_codec)
- Issue #19132: The pprint module now supports compact mode.
- Issue #19137: The pprint module now correctly formats instances of set and
frozenset subclasses.
- Issue #10042: functools.total_ordering now correctly handles
NotImplemented being returned by the underlying comparison function (Patch
by Katie Miller)
- Issue #19092: contextlib.ExitStack now correctly reraises exceptions
from the __exit__ callbacks of inner context managers (Patch by Hrvoje
Nikšić)
- Issue #12641: Avoid passing "-mno-cygwin" to the mingw32 compiler, except
when necessary. Patch by Oscar Benjamin.
- Issue #5845: In site.py, only load readline history from ~/.python_history
if no history has been read already. This avoids double writes to the
history file at shutdown.
- Properly initialize all fields of a SSL object after allocation.
- Issue #19095: SSLSocket.getpeercert() now raises ValueError when the
SSL handshake hasn't been done.
- Issue #4366: Fix building extensions on all platforms when --enable-shared
is used.
- Issue #19030: Fixed `inspect.getmembers` and `inspect.classify_class_attrs`
to attempt activating descriptors before falling back to a __dict__ search
for faulty descriptors. `inspect.classify_class_attrs` no longer returns
Attributes whose home class is None.
C API
-----
- Issue #1772673: The type of `char*` arguments now changed to `const char*`.
- Issue #16129: Added a `Py_SetStandardStreamEncoding` pre-initialization API
to allow embedding applications like Blender to force a particular
encoding and error handler for the standard IO streams (initial patch by
Bastien Montagne)
Tests
-----
- Issue #19275: Fix test_site on AMD64 Snow Leopard
- Issue #14407: Fix unittest test discovery in test_concurrent_futures.
- Issue #18919: Unified and extended tests for audio modules: aifc, sunau and
wave.
- Issue #18714: Added tests for ``pdb.find_function()``.
Documentation
-------------
- Issue #18758: Fixed and improved cross-references.
- Issue #18972: Modernize email examples and use the argparse module in them.
Build
-----
- Issue #19130: Correct PCbuild/readme.txt, Python 3.3 and 3.4 require VS 2010.
- Issue #15663: Update OS X 10.6+ installer to use Tcl/Tk 8.5.15.
- Issue #14499: Fix several problems with OS X universal build support:
1. ppc arch detection for extension module builds broke with Xcode 5
2. ppc arch detection in configure did not work on OS X 10.4
3. -sysroot and -arch flags were unnecessarily duplicated
4. there was no obvious way to configure an intel-32 only build.
- Issue #19019: Change the OS X installer build script to use CFLAGS instead
of OPT for special build options. By setting OPT, some compiler-specific
options like -fwrapv were overridden and thus not used, which could result
in broken interpreters when building with clang.
What's New in Python 3.4.0 Alpha 3?
===================================
Release date: 2013-09-29
Core and Builtins
-----------------
- Issue #18818: The "encodingname" part of PYTHONIOENCODING is now optional.
- Issue #19098: Prevent overflow in the compiler when the recursion limit is set
absurdly high.
Library
-------
- Issue #18929: `inspect.classify_class_attrs()` now correctly finds class
attributes returned by `dir()` that are located in the metaclass.
- Issue #18950: Fix miscellaneous bugs in the sunau module.
Au_read.readframes() now updates current file position and reads correct
number of frames from multichannel stream. Au_write.writeframesraw() now
correctly updates current file position. Au_read.getnframes() now returns an
integer (as in Python 2). Au_read and Au_write now correctly works with file
object if start file position is not a zero.
- Issue #18594: The fast path for collections.Counter() was never taken
due to an over-restrictive type check.
- Issue #19053: ZipExtFile.read1() with non-zero argument no more returns empty
bytes until end of data.
- logging: added support for Unix domain sockets to SocketHandler and
DatagramHandler.
- Issue #18996: TestCase.assertEqual() now more cleverly shorten differing
strings in error report.
- Issue #19034: repr() for tkinter.Tcl_Obj now exposes string reperesentation.
- Issue #18978: ``urllib.request.Request`` now allows the method to be
indicated on the class and no longer sets it to None in ``__init__``.
- Issue #18626: the inspect module now offers a basic command line
introspection interface (Initial patch by Claudiu Popa)
- Issue #3015: Fixed tkinter with wantobject=False. Any Tcl command call
returned empty string.
- Issue #19037: The mailbox module now makes all changes to maildir files
before moving them into place, to avoid race conditions with other programs
that may be accessing the maildir directory.
- Issue #14984: On POSIX systems, when netrc is called without a filename
argument (and therefore is reading the user's $HOME/.netrc file), it now
enforces the same security rules as typical ftp clients: the .netrc file must
be owned by the user that owns the process and must not be readable by any
other user.
- Issue #18873: The tokenize module now detects Python source code encoding
only in comment lines.
- Issue #17764: Enable http.server to bind to a user specified network
interface. Patch contributed by Malte Swart.
- Issue #18937: Add an assertLogs() context manager to unittest.TestCase
to ensure that a block of code emits a message using the logging module.
- Issue #17324: Fix http.server's request handling case on trailing '/'. Patch
contributed by Vajrasky Kok.
- Issue #19018: The heapq.merge() function no longer suppresses IndexError
in the underlying iterables.
- Issue #18784: The uuid module no longer attempts to load libc via ctypes.CDLL
if all the necessary functions have already been found in libuuid. Patch by
Evgeny Sologubov.
- The :envvar:`PYTHONFAULTHANDLER` environment variable now only enables the
faulthandler module if the variable is non-empty. Same behaviour than other
variables like :envvar:`PYTHONDONTWRITEBYTECODE`.
- Issue #1565525: New function ``traceback.clear_frames`` will clear
the local variables of all the stack frames referenced by a traceback
object.
Tests
-----
- Issue #18952: Fix regression in support data downloads introduced when
test.support was converted to a package. Regression noticed by Zachary
Ware.
IDLE
----
- Issue #18873: IDLE now detects Python source code encoding only in comment
lines.
- Issue #18988: The "Tab" key now works when a word is already autocompleted.
Documentation
-------------
- Issue #17003: Unified the size argument names in the io module with common
practice.
Build
-----
- Issue #18596: Support the use of address sanity checking in recent versions
of clang and GCC by appropriately marking known false alarms in the small
object allocator. Patch contributed by Dhiru Kholia.
Tools/Demos
-----------
- Issue #18873: 2to3 and the findnocoding.py script now detect Python source
code encoding only in comment lines.
What's New in Python 3.4.0 Alpha 2?
===================================
Release date: 2013-09-09
Core and Builtins
-----------------
- Issue #18942: sys._debugmallocstats() output was damaged on Windows.
- Issue #18571: Implementation of the PEP 446: file descriptors and file
handles are now created non-inheritable; add functions
os.get/set_inheritable(), os.get/set_handle_inheritable() and
socket.socket.get/set_inheritable().
- Issue #11619: The parser and the import machinery do not encode Unicode
filenames anymore on Windows.
- Issue #18808: Non-daemon threads are now automatically joined when
a sub-interpreter is shutdown (it would previously dump a fatal error).
- Remove support for compiling on systems without getcwd().
- Issue #18774: Remove last bits of GNU PTH thread code and thread_pth.h.
- Issue #18771: Add optimization to set object lookups to reduce the cost
of hash collisions. The core idea is to inspect a second key/hash pair
for each cache line retrieved.
- Issue #16105: When a signal handler fails to write to the file descriptor
registered with ``signal.set_wakeup_fd()``, report an exception instead
of ignoring the error.
- Issue #18722: Remove uses of the "register" keyword in C code.
- Issue #18667: Add missing "HAVE_FCHOWNAT" symbol to posix._have_functions.
- Issue #16499: Add command line option for isolated mode.
- Issue #15301: Parsing fd, uid, and gid parameters for builtins
in Modules/posixmodule.c is now far more robust.
- Issue #18368: PyOS_StdioReadline() no longer leaks memory when realloc()
fail.
- Issue #17934: Add a clear() method to frame objects, to help clean up
expensive details (local variables) and break reference cycles.
- Issue #18780: %-formatting codes %d, %i, and %u now treat int-subclasses
as int (displays value of int-subclass instead of str(int-subclass) ).
Library
-------
- Issue #18808: Thread.join() now waits for the underlying thread state to
be destroyed before returning. This prevents unpredictable aborts in
Py_EndInterpreter() when some non-daemon threads are still running.
- Issue #18458: Prevent crashes with newer versions of libedit. Its readline
emulation has changed from 0-based indexing to 1-based like gnu readline.
- Issue #18852: Handle case of ``readline.__doc__`` being ``None`` in the new
readline activation code in ``site.py``.
- Issue #18672: Fixed format specifiers for Py_ssize_t in debugging output in
the _sre module.
- Issue #18830: inspect.getclasstree() no longer produces duplicate entries even
when input list contains duplicates.
- Issue #18878: sunau.open now supports the context manager protocol. Based on
patches by Claudiu Popa and R. David Murray.
- Issue #18909: Fix _tkinter.tkapp.interpaddr() on Windows 64-bit, don't cast
64-bit pointer to long (32 bits).
- Issue #18876: The FileIO.mode attribute now better reflects the actual mode
under which the file was opened. Patch by Erik Bray.
- Issue #16853: Add new selectors module.
- Issue #18882: Add threading.main_thread() function.
- Issue #18901: The sunau getparams method now returns a namedtuple rather than
a plain tuple. Patch by Claudiu Popa.
- Issue #17487: The result of the wave getparams method now is pickleable again.
Patch by Claudiu Popa.
- Issue #18756: os.urandom() now uses a lazily-opened persistent file
descriptor, so as to avoid using many file descriptors when run in
parallel from multiple threads.
- Issue #18418: After fork(), reinit all threads states, not only active ones.
Patch by A. Jesse Jiryu Davis.
- Issue #17974: Switch unittest from using getopt to using argparse.
- Issue #11798: TestSuite now drops references to own tests after execution.
- Issue #16611: http.cookie now correctly parses the 'secure' and 'httponly'
cookie flags.
- Issue #11973: Fix a problem in kevent. The flags and fflags fields are now
properly handled as unsigned.
- Issue #18807: ``pyvenv`` now takes a --copies argument allowing copies
instead of symlinks even where symlinks are available and the default.
- Issue #18538: ``python -m dis`` now uses argparse for argument processing.
Patch by Michele Orrù.
- Issue #18394: Close cgi.FieldStorage's optional file.
- Issue #17702: On error, os.environb now suppresses the exception context
when raising a new KeyError with the original key.
- Issue #16809: Fixed some tkinter incompabilities with Tcl/Tk 8.6.
- Issue #16809: Tkinter's splitlist() and split() methods now accept Tcl_Obj
argument.
- Issue #18324: set_payload now correctly handles binary input. This also
supersedes the previous fixes for #14360, #1717, and #16564.
- Issue #18794: Add a fileno() method and a closed attribute to select.devpoll
objects.
- Issue #17119: Fixed integer overflows when processing large strings and tuples
in the tkinter module.
- Issue #18747: Re-seed OpenSSL's pseudo-random number generator after fork.
A pthread_atfork() parent handler is used to seed the PRNG with pid, time
and some stack data.
- Issue #8865: Concurrent invocation of select.poll.poll() now raises a
RuntimeError exception. Patch by Christian Schubert.
- Issue #18777: The ssl module now uses the new CRYPTO_THREADID API of
OpenSSL 1.0.0+ instead of the deprecated CRYPTO id callback function.
- Issue #18768: Correct doc string of RAND_edg(). Patch by Vajrasky Kok.
- Issue #18178: Fix ctypes on BSD. dlmalloc.c was compiled twice which broke
malloc weak symbols.
- Issue #18709: Fix CVE-2013-4238. The SSL module now handles NULL bytes
inside subjectAltName correctly. Formerly the module has used OpenSSL's
GENERAL_NAME_print() function to get the string represention of ASN.1
strings for ``rfc822Name`` (email), ``dNSName`` (DNS) and
``uniformResourceIdentifier`` (URI).
- Issue #18701: Remove support of old CPython versions (<3.0) from C code.
- Issue #18756: Improve error reporting in os.urandom() when the failure
is due to something else than /dev/urandom not existing (for example,
exhausting the file descriptor limit).
- Issue #18673: Add O_TMPFILE to os module. O_TMPFILE requires Linux kernel
3.11 or newer. It's only defined on system with 3.11 uapi headers, too.
- Issue #18532: Change the builtin hash algorithms' names to lower case names
as promised by hashlib's documentation.
- Issue #8713: add new spwan and forkserver start methods, and new functions
get_all_start_methods, get_start_method, and set_start_method, to
multiprocessing.
- Issue #18405: Improve the entropy of crypt.mksalt().
- Issue #12015: The tempfile module now uses a suffix of 8 random characters
instead of 6, to reduce the risk of filename collision. The entropy was
reduced when uppercase letters were removed from the charset used to generate
random characters.
- Issue #18585: Add :func:`textwrap.shorten` to collapse and truncate a
piece of text to a given length.
- Issue #18598: Tweak exception message for importlib.import_module() to
include the module name when a key argument is missing.
- Issue #19151: Fix docstring and use of _get_supported_file_loaders() to
reflect 2-tuples.
- Issue #19152: Add ExtensionFileLoader.get_filename().
- Issue #18676: Change 'positive' to 'non-negative' in queue.py put and get
docstrings and ValueError messages. Patch by Zhongyue Luo
- Fix refcounting issue with extension types in tkinter.
- Issue #8112: xlmrpc.server's DocXMLRPCServer server no longer raises an error
if methods have annotations; it now correctly displays the annotations.
- Issue #18600: Added policy argument to email.message.Message.as_string,
and as_bytes and __bytes__ methods to Message.
- Issue #18671: Output more information when logging exceptions occur.
- Issue #18621: Prevent the site module's patched builtins from keeping
too many references alive for too long.
- Issue #4885: Add weakref support to mmap objects. Patch by Valerie Lambert.
- Issue #8860: Fixed rounding in timedelta constructor.
- Issue #18849: Fixed a Windows-specific tempfile bug where collision with an
existing directory caused mkstemp and related APIs to fail instead of
retrying. Report and fix by Vlad Shcherbina.
- Issue #18920: argparse's default destination for the version action (-v,
--version) has also been changed to stdout, to match the Python executable.
Tests
-----
- Issue #18623: Factor out the _SuppressCoreFiles context manager into
test.support. Patch by Valerie Lambert.
- Issue #12037: Fix test_email for desktop Windows.
- Issue #15507: test_subprocess's test_send_signal could fail if the test
runner were run in an environment where the process inherited an ignore
setting for SIGINT. Restore the SIGINT handler to the desired
KeyboardInterrupt raising one during that test.
- Issue #16799: Switched from getopt to argparse style in regrtest's argument
parsing. Added more tests for regrtest's argument parsing.
- Issue #18792: Use "127.0.0.1" or "::1" instead of "localhost" as much as
possible, since "localhost" goes through a DNS lookup under recent Windows
versions.
IDLE
----
- Issue #18489: Add tests for SearchEngine. Original patch by Phil Webster.
Documentation
-------------
- Issue #18743: Fix references to non-existant "StringIO" module.
- Issue #18783: Removed existing mentions of Python long type in docstrings,
error messages and comments.
Build
-----
- Issue #1584: Provide configure options to override default search paths for
Tcl and Tk when building _tkinter.
- Issue #15663: Tcl/Tk 8.5.14 is now included with the OS X 10.6+ 64-/32-bit
installer. It is no longer necessary to install a third-party version of
Tcl/Tk 8.5 to work around the problems in the Apple-supplied Tcl/Tk 8.5
shipped in OS X 10.6 and later releases.
Tools/Demos
-----------
- Issue #18922: Now The Lib/smtpd.py and Tools/i18n/msgfmt.py scripts write
their version strings to stdout, and not to sderr.
What's New in Python 3.4.0 Alpha 1?
===================================
Release date: 2013-08-03
Core and Builtins
-----------------
- Issue #16741: Fix an error reporting in int().
- Issue #17899: Fix rare file descriptor leak in os.listdir().
- Issue #10241: Clear extension module dict copies at interpreter shutdown.
Patch by Neil Schemenauer, minimally modified.
- Issue #9035: ismount now recognises volumes mounted below a drive root
on Windows. Original patch by Atsuo Ishimoto.
- Issue #18214: Improve finalization of Python modules to avoid setting
their globals to None, in most cases.
- Issue #18112: PEP 442 implementation (safe object finalization).
- Issue #18552: Check return value of PyArena_AddPyObject() in
obj2ast_object().
- Issue #18560: Fix potential NULL pointer dereference in sum().
- Issue #18520: Add a new PyStructSequence_InitType2() function, same than
PyStructSequence_InitType() except that it has a return value (0 on success,
-1 on error).
- Issue #15905: Fix theoretical buffer overflow in handling of sys.argv[0],
prefix and exec_prefix if the operation system does not obey MAXPATHLEN.
- Issue #18408: Fix many various bugs in code handling errors, especially
on memory allocation failure (MemoryError).
- Issue #18344: Fix potential ref-leaks in _bufferedreader_read_all().
- Issue #18342: Use the repr of a module name when an import fails when using
``from ... import ...``.
- Issue #17872: Fix a segfault in marshal.load() when input stream returns
more bytes than requested.
- Issue #18338: `python --version` now prints version string to stdout, and
not to stderr. Patch by Berker Peksag and Michael Dickens.
- Issue #18426: Fix NULL pointer dereference in C extension import when
PyModule_GetDef() returns an error.
- Issue #17206: On Windows, increase the stack size from 2 MB to 4.2 MB to fix
a stack overflow in the marshal module (fix a crash in test_marshal).
Patch written by Jeremy Kloth.
- Issue #3329: Implement the PEP 445: Add new APIs to customize Python memory
allocators.
- Issue #18328: Reorder ops in PyThreadState_Delete*() functions. Now the
tstate is first removed from TLS and then deallocated.
- Issue #13483: Use VirtualAlloc in obmalloc on Windows.
- Issue #18184: PyUnicode_FromFormat() and PyUnicode_FromFormatV() now raise
OverflowError when an argument of %c format is out of range.
- Issue #18111: The min() and max() functions now support a default argument
to be returned instead of raising a ValueError on an empty sequence.
(Contributed by Julian Berman.)
- Issue #18137: Detect integer overflow on precision in float.__format__()
and complex.__format__().
- Issue #18183: Fix various unicode operations on strings with large unicode
codepoints.
- Issue #18180: Fix ref leak in _PyImport_GetDynLoadWindows().
- Issue #18038: SyntaxError raised during compilation sources with illegal
encoding now always contains an encoding name.
- Issue #17931: Resolve confusion on Windows between pids and process
handles.
- Tweak the exception message when the magic number or size value in a bytecode
file is truncated.
- Issue #17932: Fix an integer overflow issue on Windows 64-bit in iterators:
change the C type of seqiterobject.it_index from long to Py_ssize_t.
- Issue #18065: Don't set __path__ to the package name for frozen packages.
- Issue #18088: When reloading a module, unconditionally reset all relevant
attributes on the module (e.g. __name__, __loader__, __package__, __file__,
__cached__).
- Issue #17937: Try harder to collect cyclic garbage at shutdown.
- Issue #12370: Prevent class bodies from interfering with the __class__
closure.
- Issue #17644: Fix a crash in str.format when curly braces are used in square
brackets.
- Issue #17237: Fix crash in the ASCII decoder on m68k.
- Issue #17927: Frame objects kept arguments alive if they had been
copied into a cell, even if the cell was cleared.
- Issue #1545463: At shutdown, defer finalization of codec modules so
that stderr remains usable.
- Issue #7330: Implement width and precision (ex: "%5.3s") for the format
string of PyUnicode_FromFormat() function, original patch written by Ysj Ray.
- Issue #1545463: Global variables caught in reference cycles are now
garbage-collected at shutdown.
- Issue #17094: Clear stale thread states after fork(). Note that this
is a potentially disruptive change since it may release some system
resources which would otherwise remain perpetually alive (e.g. database
connections kept in thread-local storage).
- Issue #17408: Avoid using an obsolete instance of the copyreg module when
the interpreter is shutdown and then started again.
- Issue #5845: Enable tab-completion in the interactive interpreter by
default, thanks to a new sys.__interactivehook__.
- Issue #17115,17116: Module initialization now includes setting __package__ and
__loader__ attributes to None.
- Issue #17853: Ensure locals of a class that shadow free variables always win
over the closures.
- Issue #17863: In the interactive console, don't loop forever if the encoding
can't be fetched from stdin.
- Issue #17867: Raise an ImportError if __import__ is not found in __builtins__.
- Issue #18698: Ensure importlib.reload() returns the module out of sys.modules.
- Issue #17857: Prevent build failures with pre-3.5.0 versions of sqlite3,
such as was shipped with Centos 5 and Mac OS X 10.4.
- Issue #17413: sys.settrace callbacks were being passed a string instead of an
exception instance for the 'value' element of the arg tuple if the exception
originated from C code; now an exception instance is always provided.
- Issue #17782: Fix undefined behaviour on platforms where
``struct timespec``'s "tv_nsec" member is not a C long.
- Issue #17722: When looking up __round__, resolve descriptors.
- Issue #16061: Speed up str.replace() for replacing 1-character strings.
- Issue #17715: Fix segmentation fault from raising an exception in a __trunc__
method.
- Issue #17643: Add __callback__ attribute to weakref.ref.
- Issue #16447: Fixed potential segmentation fault when setting __name__ on a
class.
- Issue #17669: Fix crash involving finalization of generators using yield from.
- Issue #14439: Python now prints the traceback on runpy failure at startup.
- Issue #17469: Fix _Py_GetAllocatedBlocks() and sys.getallocatedblocks()
when running on valgrind.
- Issue #17619: Make input() check for Ctrl-C correctly on Windows.
- Issue #17357: Add missing verbosity messages for -v/-vv that were lost during
the importlib transition.
- Issue #17610: Don't rely on non-standard behavior of the C qsort() function.
- Issue #17323: The "[X refs, Y blocks]" printed by debug builds has been
disabled by default. It can be re-enabled with the `-X showrefcount` option.
- Issue #17328: Fix possible refleak in dict.setdefault.
- Issue #17275: Corrected class name in init error messages of the C version of
BufferedWriter and BufferedRandom.
- Issue #7963: Fixed misleading error message that issued when object is
called without arguments.
- Issue #8745: Small speed up zipimport on Windows. Patch by Catalin Iacob.
- Issue #5308: Raise ValueError when marshalling too large object (a sequence
with size >= 2**31), instead of producing illegal marshal data.
- Issue #12983: Bytes literals with invalid \x escape now raise a SyntaxError
and a full traceback including line number.
- Issue #16967: In function definition, evaluate positional defaults before
keyword-only defaults.
- Issue #17173: Remove uses of locale-dependent C functions (isalpha() etc.)
in the interpreter.
- Issue #17137: When an Unicode string is resized, the internal wide character
string (wstr) format is now cleared.
- Issue #17043: The unicode-internal decoder no longer read past the end of
input buffer.
- Issue #17098: All modules now have __loader__ set even if they pre-exist the
bootstrapping of importlib.
- Issue #16979: Fix error handling bugs in the unicode-escape-decode decoder.
- Issue #16772: The base argument to the int constructor no longer accepts
floats, or other non-integer objects with an __int__ method. Objects
with an __index__ method are now accepted.
- Issue #10156: In the interpreter's initialization phase, unicode globals
are now initialized dynamically as needed.
- Issue #16980: Fix processing of escaped non-ascii bytes in the
unicode-escape-decode decoder.
- Issue #16975: Fix error handling bug in the escape-decode bytes decoder.
- Issue #14850: Now a charmap decoder treats U+FFFE as "undefined mapping"
in any mapping, not only in a string.
- Issue #16613: Add *m* argument to ``collections.Chainmap.new_child`` to
allow the new child map to be specified explicitly.
- Issue #16730: importlib.machinery.FileFinder now no longers raises an
exception when trying to populate its cache and it finds out the directory is
unreadable or has turned into a file. Reported and diagnosed by
David Pritchard.
- Issue #16906: Fix a logic error that prevented most static strings from being
cleared.
- Issue #11461: Fix the incremental UTF-16 decoder. Original patch by
Amaury Forgeot d'Arc.
- Issue #16856: Fix a segmentation fault from calling repr() on a dict with
a key whose repr raise an exception.
- Issue #16367: Fix FileIO.readall() on Windows for files larger than 2 GB.
- Issue #16761: Calling int() with base argument only now raises TypeError.
- Issue #16759: Support the full DWORD (unsigned long) range in Reg2Py
when retrieving a REG_DWORD value. This corrects functions like
winreg.QueryValueEx that may have been returning truncated values.
- Issue #14420: Support the full DWORD (unsigned long) range in Py2Reg
when passed a REG_DWORD value. Fixes OverflowError in winreg.SetValueEx.
- Issue #11939: Set the st_dev attribute of stat_result to allow Windows to
take advantage of the os.path.samefile/sameopenfile/samestat implementations
used by other platforms.
- Issue #16772: The int() constructor's second argument (base) no longer
accepts non integer values. Consistent with the behavior in Python 2.
- Issue #14470: Remove w9xpopen support per PEP 11.
- Issue #9856: Replace deprecation warning with raising TypeError
in object.__format__. Patch by Florent Xicluna.
- Issue #16597: In buffered and text IO, call close() on the underlying stream
if invoking flush() fails.
- Issue #16722: In the bytes() constructor, try to call __bytes__ on the
argument before __index__.
- Issue #16421: loading multiple modules from one shared object is now
handled correctly (previously, the first module loaded from that file
was silently returned). Patch by Václav Šmilauer.
- Issue #16602: When a weakref's target was part of a long deallocation
chain, the object could remain reachable through its weakref even though
its refcount had dropped to zero.
- Issue #16495: Remove extraneous NULL encoding check from bytes_decode().
- Issue #16619: Create NameConstant AST class to represent None, True, and False
literals. As a result, these constants are never loaded at runtime from
builtins.
- Issue #16455: On FreeBSD and Solaris, if the locale is C, the
ASCII/surrogateescape codec is now used (instead of the locale encoding) to
decode the command line arguments. This change fixes inconsistencies with
os.fsencode() and os.fsdecode(), because these operating systems announce an
ASCII locale encoding, but actually use the ISO-8859-1 encoding in practice.
- Issue #16562: Optimize dict equality testing. Patch by Serhiy Storchaka.
- Issue #16588: Silence unused-but-set warnings in Python/thread_pthread
- Issue #16592: stringlib_bytes_join doesn't raise MemoryError on allocation
failure.
- Issue #16546: Fix: ast.YieldFrom argument is now mandatory.
- Issue #16514: Fix regression causing a traceback when sys.path[0] is None
(actually, any non-string or non-bytes type).
- Issue #16306: Fix multiple error messages when unknown command line
parameters where passed to the interpreter. Patch by Hieu Nguyen.
- Issue #16215: Fix potential double memory free in str.replace(). Patch
by Serhiy Storchaka.
- Issue #16290: A float return value from the __complex__ special method is no
longer accepted in the complex() constructor.
- Issue #16416: On Mac OS X, operating system data are now always
encoded/decoded to/from UTF-8/surrogateescape, instead of the locale encoding
(which may be ASCII if no locale environment variable is set), to avoid
inconsistencies with os.fsencode() and os.fsdecode() functions which are
already using UTF-8/surrogateescape.
- Issue #16453: Fix equality testing of dead weakref objects.
- Issue #9535: Fix pending signals that have been received but not yet
handled by Python to not persist after os.fork() in the child process.
- Issue #14794: Fix slice.indices to return correct results for huge values,
rather than raising OverflowError.
- Issue #15001: fix segfault on "del sys.modules['__main__']". Patch by Victor
Stinner.
- Issue #8271: the utf-8 decoder now outputs the correct number of U+FFFD
characters when used with the 'replace' error handler on invalid utf-8
sequences. Patch by Serhiy Storchaka, tests by Ezio Melotti.
- Issue #5765: Apply a hard recursion limit in the compiler instead of
blowing the stack and segfaulting. Initial patch by Andrea Griffini.
- Issue #16402: When slicing a range, fix shadowing of exceptions from
__index__.
- Issue #16336: fix input checking in the surrogatepass error handler.
Patch by Serhiy Storchaka.
- Issue #8401: assigning an int to a bytearray slice (e.g. b[3:4] = 5) now
raises an error.
- Issue #7317: Display full tracebacks when an error occurs asynchronously.
Patch by Alon Horev with update by Alexey Kachayev.
- Issue #16309: Make PYTHONPATH="" behavior the same as if PYTHONPATH
not set at all.
- Issue #10189: Improve the error reporting of SyntaxErrors related to global
and nonlocal statements.
- Fix segfaults on setting __qualname__ on builtin types and attempting to
delete it on any type.
- Issue #14625: Rewrite the UTF-32 decoder. It is now 3x to 4x faster. Patch
written by Serhiy Storchaka.
- Issue #16345: Fix an infinite loop when ``fromkeys`` on a dict subclass
received a nonempty dict from the constructor.
- Issue #16271: Fix strange bugs that resulted from __qualname__ appearing in a
class's __dict__ and on type.
- Issue #12805: Make bytes.join and bytearray.join faster when the separator
is empty. Patch by Serhiy Storchaka.
- Issue #6074: Ensure cached bytecode files can always be updated by the
user that created them, even when the source file is read-only.
- Issue #15958: bytes.join and bytearray.join now accept arbitrary buffer
objects.
- Issue #14783: Improve int() docstring and switch docstrings for str(),
range(), and slice() to use multi-line signatures.
- Issue #16160: Subclass support now works for types.SimpleNamespace.
- Issue #16148: Implement PEP 424, adding operator.length_hint and
PyObject_LengthHint.
- Upgrade Unicode data (UCD) to version 6.2.
- Issue #15379: Fix passing of non-BMP characters as integers for the charmap
decoder (already working as unicode strings). Patch by Serhiy Storchaka.
- Issue #15144: Fix possible integer overflow when handling pointers as integer
values, by using `Py_uintptr_t` instead of `size_t`. Patch by Serhiy
Storchaka.
- Issue #15965: Explicitly cast `AT_FDCWD` as (int). Required on Solaris 10
(which defines `AT_FDCWD` as ``0xffd19553``), harmless on other platforms.
- Issue #15839: Convert SystemErrors in `super()` to RuntimeErrors.
- Issue #15448: Buffered IO now frees the buffer when closed, instead
of when deallocating.
- Issue #15846: Fix SystemError which happened when using `ast.parse()` in an
exception handler on code with syntax errors.
- Issue #15897: zipimport.c doesn't check return value of fseek().
Patch by Felipe Cruz.
- Issue #15801: Make sure mappings passed to '%' formatting are actually
subscriptable.
- Issue #15111: __import__ should propagate ImportError when raised as a
side-effect of a module triggered from using fromlist.
- Issue #15022: Add pickle and comparison support to types.SimpleNamespace.
Library
-------
- Issue #4331: Added functools.partialmethod (Initial patch by Alon Horev)
- Issue #13461: Fix a crash in the TextIOWrapper.tell method on 64-bit
platforms. Patch by Yogesh Chaudhari.
- Issue #18681: Fix a NameError in importlib.reload() (noticed by Weizhao Li).
- Issue #14323: Expanded the number of digits in the coefficients for the
RGB -- YIQ conversions so that they match the FCC NTSC versions.
- Issue #17998: Fix an internal error in regular expression engine.
- Issue #17557: Fix os.getgroups() to work with the modified behavior of
getgroups(2) on OS X 10.8. Original patch by Mateusz Lenik.
- Issue #18608: Avoid keeping a strong reference to the locale module
inside the _io module.
- Issue #18619: Fix atexit leaking callbacks registered from sub-interpreters,
and make it GC-aware.
- Issue #15699: The readline module now uses PEP 3121-style module
initialization, so as to reclaim allocated resources (Python callbacks)
at shutdown. Original patch by Robin Schreiber.
- Issue #17616: wave.open now supports the context manager protocol.
- Issue #18599: Fix name attribute of _sha1.sha1() object. It now returns
'SHA1' instead of 'SHA'.
- Issue #13266: Added inspect.unwrap to easily unravel __wrapped__ chains
(initial patch by Daniel Urban and Aaron Iles)
- Issue #18561: Skip name in ctypes' _build_callargs() if name is NULL.
- Issue #18559: Fix NULL pointer dereference error in _pickle module
- Issue #18556: Check the return type of PyUnicode_AsWideChar() in ctype's
U_set().
- Issue #17818: aifc.getparams now returns a namedtuple.
- Issue #18549: Eliminate dead code in socket_ntohl()
- Issue #18530: Remove additional stat call from posixpath.ismount.
Patch by Alex Gaynor.
- Issue #18514: Fix unreachable Py_DECREF() call in PyCData_FromBaseObj()
- Issue #9177: Calling read() or write() now raises ValueError, not
AttributeError, on a closed SSL socket. Patch by Senko Rasic.
- Issue #18513: Fix behaviour of cmath.rect w.r.t. signed zeros on OS X 10.8 +
gcc.
- Issue #18479: Changed venv Activate.ps1 to make deactivate a function, and
removed Deactivate.ps1.
- Issue #18480: Add missing call to PyType_Ready to the _elementtree extension.
- Issue #17778: Fix test discovery for test_multiprocessing. (Patch by
Zachary Ware.)
- Issue #18393: The private module _gestalt and private functions
platform._mac_ver_gestalt, platform._mac_ver_lookup and
platform._bcd2str have been removed. This does not affect the public
interface of the platform module.
- Issue #17482: functools.update_wrapper (and functools.wraps) now set the
__wrapped__ attribute correctly even if the underlying function has a
__wrapped__ attribute set.
- Issue #18431: The new email header parser now decodes RFC2047 encoded words
in structured headers.
- Issue #18432: The sched module's queue method was incorrectly returning
an iterator instead of a list.
- Issue #18044: The new email header parser was mis-parsing encoded words where
an encoded character immediately followed the '?' that follows the CTE
character, resulting in a decoding failure. They are now decoded correctly.
- Issue #18101: Tcl.split() now process strings nested in a tuple as it
do with byte strings.
- Issue #18116: getpass was always getting an error when testing /dev/tty,
and thus was always falling back to stdin, and would then raise an exception
if stdin could not be used (such as /dev/null). It also leaked an open file.
All of these issues are now fixed.
- Issue #17198: Fix a NameError in the dbm module. Patch by Valentina
Mukhamedzhanova.
- Issue #18013: Fix cgi.FieldStorage to parse the W3C sample form.
- Issue #18020: improve html.escape speed by an order of magnitude.
Patch by Matt Bryant.
- Issue #18347: ElementTree's html serializer now preserves the case of
closing tags.
- Issue #17261: Ensure multiprocessing's proxies use proper address.
- Issue #18343: faulthandler.register() now keeps the previous signal handler
when the function is called twice, so faulthandler.unregister() restores
correctly the original signal handler.
- Issue #17097: Make multiprocessing ignore EINTR.
- Issue #18339: Negative ints keys in unpickler.memo dict no longer cause a
segfault inside the _pickle C extension.
- Issue #18240: The HMAC module is no longer restricted to bytes and accepts
any bytes-like object, e.g. memoryview. Original patch by Jonas Borgström.
- Issue #18224: Removed pydoc script from created venv, as it causes problems
on Windows and adds no value over and above python -m pydoc ...
- Issue #18155: The csv module now correctly handles csv files that use
a delimter character that has a special meaning in regexes, instead of
throwing an exception.
- Issue #14360: encode_quopri can now be successfully used as an encoder
when constructing a MIMEApplication object.
- Issue #11390: Add -o and -f command line options to the doctest CLI to
specify doctest options (and convert it to using argparse).
- Issue #18135: ssl.SSLSocket.write() now raises an OverflowError if the input
string in longer than 2 gigabytes, and ssl.SSLContext.load_cert_chain()
raises a ValueError if the password is longer than 2 gigabytes. The ssl
module does not support partial write.
- Issue #11016: Add C implementation of the stat module as _stat.
- Issue #18248: Fix libffi build on AIX.
- Issue #18259: Declare sethostname in socketmodule.c for AIX
- Issue #18147: Add diagnostic functions to ssl.SSLContext(). get_ca_list()
lists all loaded CA certificates and cert_store_stats() returns amount of
loaded X.509 certs, X.509 CA certs and CRLs.
- Issue #18167: cgi.FieldStorage no longer fails to handle multipart/form-data
when \r\n appears at end of 65535 bytes without other newlines.
- Issue #18076: Introduce importlib.util.decode_source().
- Issue #18357: add tests for dictview set difference.
Patch by Fraser Tweedale.
- importlib.abc.SourceLoader.get_source() no longer changes SyntaxError or
UnicodeDecodeError into ImportError.
- Issue #18058, 18057: Make the namespace package loader meet the
importlib.abc.InspectLoader ABC, allowing for namespace packages to work with
runpy.
- Issue #17177: The imp module is pending deprecation.
- subprocess: Prevent a possible double close of parent pipe fds when the
subprocess exec runs into an error. Prevent a regular multi-close of the
/dev/null fd when any of stdin, stdout and stderr was set to DEVNULL.
- Issue #18194: Introduce importlib.util.cache_from_source() and
source_from_cache() while documenting the equivalent functions in imp as
deprecated.
- Issue #17907: Document imp.new_module() as deprecated in favour of
types.ModuleType.
- Issue #18192: Introduce importlib.util.MAGIC_NUMBER and document as deprecated
imp.get_magic().
- Issue #18149: Add filecmp.clear_cache() to manually clear the filecmp cache.
Patch by Mark Levitt
- Issue #18193: Add importlib.reload().
- Issue #18157: Stop using imp.load_module() in pydoc.
- Issue #16102: Make uuid._netbios_getnode() work again on Python 3.
- Issue #17134: Add ssl.enum_cert_store() as interface to Windows' cert store.
- Issue #18143: Implement ssl.get_default_verify_paths() in order to debug
the default locations for cafile and capath.
- Issue #17314: Move multiprocessing.forking over to importlib.
- Issue #11959: SMTPServer and SMTPChannel now take an optional map, use of
which avoids affecting global state.
- Issue #18109: os.uname() now decodes fields from the locale encoding, and
socket.gethostname() now decodes the hostname from the locale encoding,
instead of using the UTF-8 encoding in strict mode.
- Issue #18089: Implement importlib.abc.InspectLoader.load_module.
- Issue #18088: Introduce importlib.abc.Loader.init_module_attrs for setting
module attributes. Leads to the pending deprecation of
importlib.util.module_for_loader.
- Issue #17403: urllib.parse.robotparser normalizes the urls before adding to
ruleline. This helps in handling certain types invalid urls in a conservative
manner. Patch contributed by Mher Movsisyan.
- Issue #18070: Have importlib.util.module_for_loader() set attributes
unconditionally in order to properly support reloading.
- Added importlib.util.module_to_load to return a context manager to provide the
proper module object to load.
- Issue #18025: Fixed a segfault in io.BufferedIOBase.readinto() when raw
stream's read() returns more bytes than requested.
- Issue #18011: As was originally intended, base64.b32decode() now raises a
binascii.Error if there are non-b32-alphabet characters present in the input
string, instead of a TypeError.
- Issue #18072: Implement importlib.abc.InspectLoader.get_code() and
importlib.abc.ExecutionLoader.get_code().
- Issue #8240: Set the SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER flag on SSL
sockets.
- Issue #17269: Workaround for socket.getaddrinfo crash on MacOS X
with port None or "0" and flags AI_NUMERICSERV.
- Issue #16986: ElementTree now correctly works with string input when the
internal XML encoding is not UTF-8 or US-ASCII.
- Issue #17996: socket module now exposes AF_LINK constant on BSD and OSX.
- Issue #17900: Allowed pickling of recursive OrderedDicts. Decreased pickled
size and pickling time.
- Issue #17914: Add os.cpu_count(). Patch by Yogesh Chaudhari, based on an
initial patch by Trent Nelson.
- Issue #17812: Fixed quadratic complexity of base64.b32encode().
Optimize base64.b32encode() and base64.b32decode() (speed up to 3x).
- Issue #17980: Fix possible abuse of ssl.match_hostname() for denial of
service using certificates with many wildcards (CVE-2013-2099).
- Issue #15758: Fix FileIO.readall() so it no longer has O(n**2) complexity.
- Issue #14596: The struct.Struct() objects now use a more compact
implementation.
- Issue #17981: logging's SysLogHandler now closes the socket when it catches
socket OSErrors.
- Issue #17964: Fix os.sysconf(): the return type of the C sysconf() function
is long, not int.
- Fix typos in the multiprocessing module.
- Issue #17754: Make ctypes.util.find_library() independent of the locale.
- Issue #17968: Fix memory leak in os.listxattr().
- Issue #17606: Fixed support of encoded byte strings in the XMLGenerator
characters() and ignorableWhitespace() methods. Original patch by Sebastian
Ortiz Vasquez.
- Issue #17732: Ignore distutils.cfg options pertaining to install paths if a
virtual environment is active.
- Issue #17915: Fix interoperability of xml.sax with file objects returned by
codecs.open().
- Issue #16601: Restarting iteration over tarfile really restarts rather
than continuing from where it left off. Patch by Michael Birtwell.
- Issue #17289: The readline module now plays nicer with external modules
or applications changing the rl_completer_word_break_characters global
variable. Initial patch by Bradley Froehle.
- Issue #12181: select module: Fix struct kevent definition on OpenBSD 64-bit
platforms. Patch by Federico Schwindt.
- Issue #11816: multiple improvements to the dis module: get_instructions
generator, ability to redirect output to a file, Bytecode and Instruction
abstractions. Patch by Nick Coghlan, Ryan Kelly and Thomas Kluyver.
- Issue #13831: Embed stringification of remote traceback in local
traceback raised when pool task raises an exception.
- Issue #15528: Add weakref.finalize to support finalization using
weakref callbacks.
- Issue #14173: Avoid crashing when reading a signal handler during
interpreter shutdown.
- Issue #15902: Fix imp.load_module() accepting None as a file when loading an
extension module.
- Issue #13721: SSLSocket.getpeercert() and SSLSocket.do_handshake() now
raise an OSError with ENOTCONN, instead of an AttributeError, when the
SSLSocket is not connected.
- Issue #14679: add an __all__ (that contains only HTMLParser) to html.parser.
- Issue #17802: Fix an UnboundLocalError in html.parser. Initial tests by
Thomas Barlow.
- Issue #17358: Modules loaded by imp.load_source() and load_compiled() (and by
extention load_module()) now have a better chance of working when reloaded.
- Issue #17804: New function ``struct.iter_unpack`` allows for streaming
struct unpacking.
- Issue #17830: When keyword.py is used to update a keyword file, it now
preserves the line endings of the original file.
- Issue #17272: Making the urllib.request's Request.full_url a descriptor.
Fixes bugs with assignment to full_url. Patch by Demian Brecht.
- Issue #17353: Plistlib emitted empty data tags with deeply nested datastructures
- Issue #11714: Use 'with' statements to assure a Semaphore releases a
condition variable. Original patch by Thomas Rachel.
- Issue #16624: `subprocess.check_output` now accepts an `input` argument,
allowing the subprocess's stdin to be provided as a (byte) string.
Patch by Zack Weinberg.
- Issue #17795: Reverted backwards-incompatible change in SysLogHandler with
Unix domain sockets.
- Issue #16694: Add a pure Python implementation of the operator module.
Patch by Zachary Ware.
- Issue #11182: remove the unused and undocumented pydoc.Scanner class.
Patch by Martin Morrison.
- Issue #17741: Add ElementTree.XMLPullParser, an event-driven parser for
non-blocking applications.
- Issue #17555: Fix ForkAwareThreadLock so that size of after fork
registry does not grow exponentially with generation of process.
- Issue #17707: fix regression in multiprocessing.Queue's get() method where
it did not block for short timeouts.
- Issue #17720: Fix the Python implementation of pickle.Unpickler to correctly
process the APPENDS opcode when it is used on non-list objects.
- Issue #17012: shutil.which() no longer falls back to the PATH environment
variable if an empty path argument is specified. Patch by Serhiy Storchaka.
- Issue #17710: Fix pickle raising a SystemError on bogus input.
- Issue #17341: Include the invalid name in the error messages from re about
invalid group names.
- Issue #17702: os.environ now raises KeyError with the original environment
variable name (str on UNIX), instead of using the encoded name (bytes on
UNIX).
- Issue #16163: Make the importlib based version of pkgutil.iter_importers
work for submodules. Initial patch by Berker Peksag.
- Issue #16804: Fix a bug in the 'site' module that caused running
'python -S -m site' to incorrectly throw an exception.
- Issue #15480: Remove the deprecated and unused TYPE_INT64 code from marshal.
Initial patch by Daniel Riti.
- Issue #2118: SMTPException is now a subclass of OSError.
- Issue #17016: Get rid of possible pointer wraparounds and integer overflows
in the re module. Patch by Nickolai Zeldovich.
- Issue #16658: add missing return to HTTPConnection.send()
Patch by Jeff Knupp.
- Issue #9556: the logging package now allows specifying a time-of-day for a
TimedRotatingFileHandler to rotate.
- Issue #14971: unittest test discovery no longer gets confused when a function
has a different __name__ than its name in the TestCase class dictionary.
- Issue #17487: The wave getparams method now returns a namedtuple rather than
a plain tuple.
- Issue #17675: socket repr() provides local and remote addresses (if any).
Patch by Giampaolo Rodola'
- Issue #17093: Make the ABCs in importlib.abc provide default values or raise
reasonable exceptions for their methods to make them more amenable to super()
calls.
- Issue #17566: Make importlib.abc.Loader.module_repr() optional instead of an
abstractmethod; now it raises NotImplementedError so as to be ignored by default.
- Issue #17678: Remove the use of deprecated method in http/cookiejar.py by
changing the call to get_origin_req_host() to origin_req_host.
- Issue #17666: Fix reading gzip files with an extra field.
- Issue #16475: Support object instancing, recursion and interned strings
in marshal
- Issue #17502: Process DEFAULT values in mock side_effect that returns iterator.
- Issue #16795: On the ast.arguments object, unify vararg with varargannotation
and kwarg and kwargannotation. Change the column offset of ast.Attribute to be
at the attribute name.
- Issue #17434: Properly raise a SyntaxError when a string occurs between future
imports.
- Issue #17117: Import and @importlib.util.set_loader now set __loader__ when
it has a value of None or the attribute doesn't exist.
- Issue #17032: The "global" in the "NameError: global name 'x' is not defined"
error message has been removed. Patch by Ram Rachum.
- Issue #18080: When building a C extension module on OS X, if the compiler
is overriden with the CC environment variable, use the new compiler as
the default for linking if LDSHARED is not also overriden. This restores
Distutils behavior introduced in 3.2.3 and inadvertently dropped in 3.3.0.
- Issue #18113: Fixed a refcount leak in the curses.panel module's
set_userptr() method. Reported by Atsuo Ishimoto.
- Implement PEP 443 "Single-dispatch generic functions".
- Implement PEP 435 "Adding an Enum type to the Python standard library".
- Issue #15596: Faster pickling of unicode strings.
- Issue #17572: Avoid chained exceptions when passing bad directives to
time.strptime(). Initial patch by Claudiu Popa.
- Issue #17435: threading.Timer's __init__ method no longer uses mutable
default values for the args and kwargs parameters.
- Issue #17526: fix an IndexError raised while passing code without filename to
inspect.findsource(). Initial patch by Tyler Doyle.
- Issue #17540: Added style parameter to logging formatter configuration by dict.
- Issue #16692: The ssl module now supports TLS 1.1 and TLS 1.2. Initial
patch by Michele Orrù.
- Issue #17025: multiprocessing: Reduce Queue and SimpleQueue contention.
- Issue #17536: Add to webbrowser's browser list: www-browser, x-www-browser,
iceweasel, iceape.
- Issue #17150: pprint now uses line continuations to wrap long string
literals.
- Issue #17488: Change the subprocess.Popen bufsize parameter default value
from unbuffered (0) to buffering (-1) to match the behavior existing code
expects and match the behavior of the subprocess module in Python 2 to avoid
introducing hard to track down bugs.
- Issue #17521: Corrected non-enabling of logger following two calls to
fileConfig().
- Issue #17508: Corrected logging MemoryHandler configuration in dictConfig()
where the target handler wasn't configured first.
- Issue #17209: curses.window.get_wch() now correctly handles KeyboardInterrupt
(CTRL+c).
- Issue #5713: smtplib now handles 421 (closing connection) error codes when
sending mail by closing the socket and reporting the 421 error code via the
exception appropriate to the command that received the error response.
- Issue #16997: unittest.TestCase now provides a subTest() context manager
to procedurally generate, in an easy way, small test instances.
- Issue #17485: Also delete the Request Content-Length header if the data
attribute is deleted. (Follow on to issue Issue #16464).
- Issue #15927: CVS now correctly parses escaped newlines and carriage
when parsing with quoting turned off.
- Issue #17467: add readline and readlines support to mock_open in
unittest.mock.
- Issue #13248: removed deprecated and undocumented difflib.isbjunk,
isbpopular.
- Issue #17192: Update the ctypes module's libffi to v3.0.13. This
specifically addresses a stack misalignment issue on x86 and issues on
some more recent platforms.
- Issue #8862: Fixed curses cleanup when getkey is interrputed by a signal.
- Issue #17443: imaplib.IMAP4_stream was using the default unbuffered IO
in subprocess, but the imap code assumes buffered IO. In Python2 this
worked by accident. IMAP4_stream now explicitly uses buffered IO.
- Issue #17476: Fixed regression relative to Python2 in undocumented pydoc
'allmethods'; it was missing unbound methods on the class.
- Issue #17474: Remove the deprecated methods of Request class.
- Issue #16709: unittest discover order is no-longer filesystem specific. Patch
by Jeff Ramnani.
- Use the HTTPS PyPI url for upload, overriding any plain HTTP URL in pypirc.
- Issue #5024: sndhdr.whichhdr now returns the frame count for WAV files
rather than -1.
- Issue #17460: Remove the strict argument of HTTPConnection and removing the
DeprecationWarning being issued from 3.2 onwards.
- Issue #16880: Do not assume _imp.load_dynamic() is defined in the imp module.
- Issue #16389: Fixed a performance regression relative to Python 3.1 in the
caching of compiled regular expressions.
- Added missing FeedParser and BytesFeedParser to email.parser.__all__.
- Issue #17431: Fix missing import of BytesFeedParser in email.parser.
- Issue #12921: http.server's send_error takes an explain argument to send more
information in response. Patch contributed by Karl.
- Issue #17414: Add timeit, repeat, and default_timer to timeit.__all__.
- Issue #1285086: Get rid of the refcounting hack and speed up
urllib.parse.unquote() and urllib.parse.unquote_to_bytes().
- Issue #17099: Have importlib.find_loader() raise ValueError when __loader__
is not set, harmonizing with what happens when the attribute is set to None.
- Expose the O_PATH constant in the os module if it is available.
- Issue #17368: Fix an off-by-one error in the Python JSON decoder that caused
a failure while decoding empty object literals when object_pairs_hook was
specified.
- Issue #17385: Fix quadratic behavior in threading.Condition. The FIFO
queue now uses a deque instead of a list.
- Issue #15806: Add contextlib.ignore(). This creates a context manager to
ignore specified exceptions, replacing the "except SomeException: pass" idiom.
- Issue #14645: The email generator classes now produce output using the
specified linesep throughout. Previously if the prolog, epilog, or
body were stored with a different linesep, that linesep was used. This
fix corrects an RFC non-compliance issue with smtplib.send_message.
- Issue #17278: Fix a crash in heapq.heappush() and heapq.heappop() when
the list is being resized concurrently.
- Issue #16962: Use getdents64 instead of the obsolete getdents syscall
in the subprocess module on Linux.
- Issue #16935: unittest now counts the module as skipped if it raises SkipTest,
instead of counting it as an error. Patch by Zachary Ware.
- Issue #17018: Make Process.join() retry if os.waitpid() fails with EINTR.
- Issue #17223: array module: Fix a crasher when converting an array containing
invalid characters (outside range [U+0000; U+10ffff]) to Unicode:
repr(array), str(array) and array.tounicode(). Patch written by Manuel Jacob.
- Issue #17197: profile/cProfile modules refactored so that code of run() and
runctx() utility functions is not duplicated in both modules.
- Issue #14720: sqlite3: Convert datetime microseconds correctly.
Patch by Lowe Thiderman.
- Issue #15132: Allow a list for the defaultTest argument of
unittest.TestProgram. Patch by Jyrki Pulliainen.
- Issue #17225: JSON decoder now counts columns in the first line starting
with 1, as in other lines.
- Issue #6623: Added explicit DeprecationWarning for ftplib.netrc, which has
been deprecated and undocumented for a long time.
- Issue #13700: Fix byte/string handling in imaplib authentication when an
authobject is specified.
- Issue #13153: Tkinter functions now raise TclError instead of ValueError when
a string argument contains non-BMP character.
- Issue #9669: Protect re against infinite loops on zero-width matching in
non-greedy repeat. Patch by Matthew Barnett.
- Issue #13169: The maximal repetition number in a regular expression has been
increased from 65534 to 2147483647 (on 32-bit platform) or 4294967294 (on
64-bit).
- Issue #17143: Fix a missing import in the trace module. Initial patch by
Berker Peksag.
- Issue #15220: email.feedparser's line splitting algorithm is now simpler and
faster.
- Issue #16743: Fix mmap overflow check on 32 bit Windows.
- Issue #16996: webbrowser module now uses shutil.which() to find a
web-browser on the executable search path.
- Issue #16800: tempfile.gettempdir() no longer left temporary files when
the disk is full. Original patch by Amir Szekely.
- Issue #17192: Import libffi-3.0.12.
- Issue #16564: Fixed regression relative to Python2 in the operation of
email.encoders.encode_7or8bit when used with binary data.
- Issue #17052: unittest discovery should use self.testLoader.
- Issue #4591: Uid and gid values larger than 2**31 are supported now.
- Issue #17141: random.vonmisesvariate() no longer hangs for large kappas.
- Issue #17149: Fix random.vonmisesvariate to always return results in
[0, 2*math.pi].
- Issue #1470548: XMLGenerator now works with binary output streams.
- Issue #6975: os.path.realpath() now correctly resolves multiple nested
symlinks on POSIX platforms.
- Issue #13773: sqlite3.connect() gets a new `uri` parameter to pass the
filename as a URI, allowing to pass custom options.
- Issue #16564: Fixed regression relative to Python2 in the operation of
email.encoders.encode_noop when used with binary data.
- Issue #10355: The mode, name, encoding and newlines properties now work on
SpooledTemporaryFile objects even when they have not yet rolled over.
Obsolete method xreadline (which has never worked in Python 3) has been
removed.
- Issue #16686: Fixed a lot of bugs in audioop module. Fixed crashes in
avgpp(), maxpp() and ratecv(). Fixed an integer overflow in add(), bias(),
and ratecv(). reverse(), lin2lin() and ratecv() no more lose precision for
32-bit samples. max() and rms() no more returns a negative result and
various other functions now work correctly with 32-bit sample -0x80000000.
- Issue #17073: Fix some integer overflows in sqlite3 module.
- Issue #16723: httplib.HTTPResponse no longer marked closed when the connection
is automatically closed.
- Issue #15359: Add CAN_BCM protocol support to the socket module. Patch by
Brian Thorne.
- Issue #16948: Fix quoted printable body encoding for non-latin1 character
sets in the email package.
- Issue #16811: Fix folding of headers with no value in the provisional email
policies.
- Issue #17132: Update symbol for "yield from" grammar changes.
- Issue #17076: Make copying of xattrs more tolerant of missing FS support.
Patch by Thomas Wouters.
- Issue #17089: Expat parser now correctly works with string input when the
internal XML encoding is not UTF-8 or US-ASCII. It also now accepts bytes
and strings larger than 2 GiB.
- Issue #6083: Fix multiple segmentation faults occured when PyArg_ParseTuple
parses nested mutating sequence.
- Issue #5289: Fix ctypes.util.find_library on Solaris.
- Issue #17106: Fix a segmentation fault in io.TextIOWrapper when an underlying
stream or a decoder produces data of an unexpected type (i.e. when
io.TextIOWrapper initialized with text stream or use bytes-to-bytes codec).
- Issue #17015: When it has a spec, a Mock object now inspects its signature
when matching calls, so that arguments can be matched positionally or
by name.
- Issue #15633: httplib.HTTPResponse is now mark closed when the server
sends less than the advertised Content-Length.
- Issue #12268: The io module file object write methods no longer abort early
when one of its write system calls is interrupted (EINTR).
- Issue #6972: The zipfile module no longer overwrites files outside of
its destination path when extracting malicious zip files.
- Issue #4844: ZipFile now raises BadZipFile when opens a ZIP file with an
incomplete "End of Central Directory" record. Original patch by Guilherme
Polo and Alan McIntyre.
- Issue #17071: Signature.bind() now works when one of the keyword arguments
is named ``self``.
- Issue #12004: Fix an internal error in PyZipFile when writing an invalid
Python file. Patch by Ben Morgan.
- Have py_compile use importlib as much as possible to avoid code duplication.
Code now raises FileExistsError if the file path to be used for the
byte-compiled file is a symlink or non-regular file as a warning that import
will not keep the file path type if it writes to that path.
- Issue #16972: Have site.addpackage() consider already known paths even when
none are explicitly passed in. Bug report and fix by Kirill.
- Issue #1602133: on Mac OS X a shared library build (``--enable-shared``)
now fills the ``os.environ`` variable correctly.
- Issue #15505: `unittest.installHandler` no longer assumes SIGINT handler is
set to a callable object.
- Issue #13454: Fix a crash when deleting an iterator created by itertools.tee()
if all other iterators were very advanced before.
- Issue #12411: Fix to cgi.parse_multipart to correctly use bytes boundaries
and bytes data. Patch by Jonas Wagner.
- Issue #16957: shutil.which() no longer searches a bare file name in the
current directory on Unix and no longer searches a relative file path with
a directory part in PATH directories. Patch by Thomas Kluyver.
- Issue #1159051: GzipFile now raises EOFError when reading a corrupted file
with truncated header or footer.
- Issue #16993: shutil.which() now preserves the case of the path and extension
on Windows.
- Issue #16992: On Windows in signal.set_wakeup_fd, validate the file
descriptor argument.
- Issue #16422: For compatibility with the Python version, the C version of
decimal now uses strings instead of integers for rounding mode constants.
- Issue #15861: tkinter now correctly works with lists and tuples containing
strings with whitespaces, backslashes or unbalanced braces.
- Issue #9720: zipfile now writes correct local headers for files larger than
4 GiB.
- Issue #16955: Fix the poll() method for multiprocessing's socket
connections on Windows.
- SSLContext.load_dh_params() now properly closes the input file.
- Issue #15031: Refactor some .pyc management code to cut down on code
duplication. Thanks to Ronan Lamy for the report and taking an initial stab
at the problem.
- Issue #16398: Optimize deque.rotate() so that it only moves pointers
and doesn't touch the underlying data with increfs and decrefs.
- Issue #16900: Issue a ResourceWarning when an ssl socket is left unclosed.
- Issue #13899: \A, \Z, and \B now correctly match the A, Z, and B literals
when used inside character classes (e.g. '[\A]'). Patch by Matthew Barnett.
- Issue #15545: Fix regression in sqlite3's iterdump method where it was
failing if the connection used a row factory (such as sqlite3.Row) that
produced unsortable objects. (Regression was introduced by fix for 9750).
- fcntl: add F_DUPFD_CLOEXEC constant, available on Linux 2.6.24+.
- Issue #15972: Fix error messages when os functions expecting a file name or
file descriptor receive the incorrect type.
- Issue #8109: The ssl module now has support for server-side SNI, thanks
to a :meth:`SSLContext.set_servername_callback` method. Patch by Daniel
Black.
- Issue #16860: In tempfile, use O_CLOEXEC when available to set the
close-on-exec flag atomically.
- Issue #16674: random.getrandbits() is now 20-40% faster for small integers.
- Issue #16009: JSON error messages now provide more information.
- Issue #16828: Fix error incorrectly raised by bz2.compress(b'') and
bz2.BZ2Compressor.compress(b''). Initial patch by Martin Packman.
- Issue #16833: In http.client.HTTPConnection, do not concatenate the request
headers and body when the payload exceeds 16 KB, since it can consume more
memory for no benefit. Patch by Benno Leslie.
- Issue #16541: tk_setPalette() now works with keyword arguments.
- Issue #16820: In configparser, `parser.popitem()` no longer raises ValueError.
This makes `parser.clean()` work correctly.
- Issue #16820: In configparser, ``parser['section'] = {}`` now preserves
section order within the parser. This makes `parser.update()` preserve section
order as well.
- Issue #16820: In configparser, ``parser['DEFAULT'] = {}`` now correctly
clears previous values stored in the default section. Same goes for
``parser.update({'DEFAULT': {}})``.
- Issue #9586: Redefine SEM_FAILED on MacOSX to keep compiler happy.
- Issue #16787: Increase asyncore and asynchat default output buffers size, to
decrease CPU usage and increase throughput.
- Issue #10527: make multiprocessing use poll() instead of select() if available.
- Issue #16688: Now regexes contained backreferences correctly work with
non-ASCII strings. Patch by Matthew Barnett.
- Issue #16486: Make aifc files act as context managers.
- Issue #16485: Now file descriptors are closed if file header patching failed
on closing an aifc file.
- Issue #16640: Run less code under a lock in sched module.
- Issue #16165: sched.scheduler.run() no longer blocks a scheduler for other
threads.
- Issue #16641: Default values of sched.scheduler.enter() are no longer
modifiable.
- Issue #16618: Make glob.glob match consistently across strings and bytes
regarding leading dots. Patch by Serhiy Storchaka.
- Issue #16788: Add samestat to Lib/ntpath.py
- Issue #16713: Parsing of 'tel' urls using urlparse separates params from
path.
- Issue #16443: Add docstrings to regular expression match objects.
Patch by Anton Kasyanov.
- Issue #15701: Fix HTTPError info method call to return the headers information.
- Issue #16752: Add a missing import to modulefinder. Patch by Berker Peksag.
- Issue #16646: ftplib.FTP.makeport() might lose socket error details.
(patch by Serhiy Storchaka)
- Issue #16626: Fix infinite recursion in glob.glob() on Windows when the
pattern contains a wildcard in the drive or UNC path. Patch by Serhiy
Storchaka.
- Issue #15783: Except for the number methods, the C version of decimal now
supports all None default values present in decimal.py. These values were
largely undocumented.
- Issue #11175: argparse.FileType now accepts encoding and errors
arguments. Patch by Lucas Maystre.
- Issue #16488: epoll() objects now support the `with` statement. Patch
by Serhiy Storchaka.
- Issue #16298: In HTTPResponse.read(), close the socket when there is no
Content-Length and the incoming stream is finished. Patch by Eran
Rundstein.
- Issue #16049: Add abc.ABC class to enable the use of inheritance to create
ABCs, rather than the more cumbersome metaclass=ABCMeta. Patch by Bruno
Dupuis.
- Expose the TCP_FASTOPEN and MSG_FASTOPEN flags in socket when they're
available.
- Issue #15701: Add a .headers attribute to urllib.error.HTTPError. Patch
contributed by Berker Peksag.
- Issue #15872: Fix 3.3 regression introduced by the new fd-based shutil.rmtree
that caused it to not ignore certain errors when ignore_errors was set.
Patch by Alessandro Moura and Serhiy Storchaka.
- Issue #16248: Disable code execution from the user's home directory by
tkinter when the -E flag is passed to Python. Patch by Zachary Ware.
- Issue #13390: New function :func:`sys.getallocatedblocks()` returns the
number of memory blocks currently allocated.
- Issue #16628: Fix a memory leak in ctypes.resize().
- Issue #13614: Fix setup.py register failure with invalid rst in description.
Patch by Julien Courteau and Pierre Paul Lefebvre.
- Issue #13512: Create ~/.pypirc securely (CVE-2011-4944). Initial patch by
Philip Jenvey, tested by Mageia and Debian.
- Issue #7719: Make distutils ignore ``.nfs*`` files instead of choking later
on. Initial patch by SilentGhost and Jeff Ramnani.
- Issue #13120: Allow to call pdb.set_trace() from thread.
Patch by Ilya Sandler.
- Issue #16585: Make CJK encoders support error handlers that return bytes per
PEP 383.
- Issue #10182: The re module doesn't truncate indices to 32 bits anymore.
Patch by Serhiy Storchaka.
- Issue #16333: use (",", ": ") as default separator in json when indent is
specified, to avoid trailing whitespace. Patch by Serhiy Storchaka.
- Issue #16573: In 2to3, treat enumerate() like a consuming call, so superfluous
list() calls aren't added to filter(), map(), and zip() which are directly
passed enumerate().
- Issue #16464: Reset the Content-Length header when a urllib Request is reused
with new data.
- Issue #12848: The pure Python pickle implementation now treats object
lengths as unsigned 32-bit integers, like the C implementation does.
Patch by Serhiy Storchaka.
- Issue #16423: urllib.request now has support for ``data:`` URLs. Patch by
Mathias Panzenböck.
- Issue #4473: Add a POP3.stls() to switch a clear-text POP3 session into
an encrypted POP3 session, on supported servers. Patch by Lorenzo Catucci.
- Issue #4473: Add a POP3.capa() method to query the capabilities advertised
by the POP3 server. Patch by Lorenzo Catucci.
- Issue #4473: Ensure the socket is shutdown cleanly in POP3.close().
Patch by Lorenzo Catucci.
- Issue #16522: added FAIL_FAST flag to doctest.
- Issue #15627: Add the importlib.abc.InspectLoader.source_to_code() method.
- Issue #16408: Fix file descriptors not being closed in error conditions
in the zipfile module. Patch by Serhiy Storchaka.
- Issue #14631: Add a new :class:`weakref.WeakMethod` to simulate weak
references to bound methods.
- Issue #16469: Fix exceptions from float -> Fraction and Decimal -> Fraction
conversions for special values to be consistent with those for float -> int
and Decimal -> int. Patch by Alexey Kachayev.
- Issue #16481: multiprocessing no longer leaks process handles on Windows.
- Issue #12428: Add a pure Python implementation of functools.partial().
Patch by Brian Thorne.
- Issue #16140: The subprocess module no longer double closes its child
subprocess.PIPE parent file descriptors on child error prior to exec().
- Remove a bare print to stdout from the subprocess module that could have
happened if the child process wrote garbage to its pre-exec error pipe.
- The subprocess module now raises its own SubprocessError instead of a
RuntimeError in various error situations which should not normally happen.
- Issue #16327: The subprocess module no longer leaks file descriptors
used for stdin/stdout/stderr pipes to the child when fork() fails.
- Issue #14396: Handle the odd rare case of waitpid returning 0 when not
expected in subprocess.Popen.wait().
- Issue #16411: Fix a bug where zlib.decompressobj().flush() might try to access
previously-freed memory. Patch by Serhiy Storchaka.
- Issue #16357: fix calling accept() on a SSLSocket created through
SSLContext.wrap_socket(). Original patch by Jeff McNeil.
- Issue #16409: The reporthook callback made by the legacy
urllib.request.urlretrieve API now properly supplies a constant non-zero
block_size as it did in Python 3.2 and 2.7. This matches the behavior of
urllib.request.URLopener.retrieve.
- Issue #16431: Use the type information when constructing a Decimal subtype
from a Decimal argument.
- Issue #15641: Clean up deprecated classes from importlib
Patch by Taras Lyapun.
- Issue #16350: zlib.decompressobj().decompress() now accumulates data from
successive calls after EOF in unused_data, instead of only saving the argument
to the last call. decompressobj().flush() now correctly sets unused_data and
unconsumed_tail. A bug in the handling of MemoryError when setting the
unconsumed_tail attribute has also been fixed. Patch by Serhiy Storchaka.
- Issue #12759: sre_parse now raises a proper error when the name of the group
is missing. Initial patch by Serhiy Storchaka.
- Issue #16152: fix tokenize to ignore whitespace at the end of the code when
no newline is found. Patch by Ned Batchelder.
- Issue #16284: Prevent keeping unnecessary references to worker functions
in concurrent.futures ThreadPoolExecutor.
- Issue #16230: Fix a crash in select.select() when one the lists changes
size while iterated on. Patch by Serhiy Storchaka.
- Issue #16228: Fix a crash in the json module where a list changes size
while it is being encoded. Patch by Serhiy Storchaka.
- Issue #16351: New function gc.get_stats() returns per-generation collection
statistics.
- Issue #14897: Enhance error messages of struct.pack and
struct.pack_into. Patch by Matti Mäki.
- Issue #16316: mimetypes now recognizes the .xz and .txz (.tar.xz) extensions.
Patch by Serhiy Storchaka.
- Issue #12890: cgitb no longer prints spurious <p> tags in text
mode when the logdir option is specified.
- Issue #16307: Fix multiprocessing.Pool.map_async not calling its callbacks.
Patch by Janne Karila.
- Issue #16305: Fix a segmentation fault occurring when interrupting
math.factorial.
- Issue #16116: Fix include and library paths to be correct when building C
extensions in venvs.
- Issue #16245: Fix the value of a few entities in html.entities.html5.
- Issue #16301: Fix the localhost verification in urllib/request.py for file://
urls.
- Issue #16250: Fix the invocations of URLError which had misplaced filename
attribute for exception.
- Issue #10836: Fix exception raised when file not found in urlretrieve
Initial patch by Ezio Melotti.
- Issue #14398: Fix size truncation and overflow bugs in the bz2 module.
- Issue #12692: Fix resource leak in urllib.request when talking to an HTTP
server that does not include a ``Connection: close`` header in its responses.
- Issue #12034: Fix bogus caching of result in check_GetFinalPathNameByHandle.
Patch by Atsuo Ishimoto.
- Improve performance of `lzma.LZMAFile` (see also issue #16034).
- Issue #16220: wsgiref now always calls close() on an iterable response.
Patch by Brent Tubbs.
- Issue #16270: urllib may hang when used for retrieving files via FTP by using
a context manager. Patch by Giampaolo Rodola'.
- Issue #16461: Wave library should be able to deal with 4GB wav files,
and sample rate of 44100 Hz.
- Issue #16176: Properly identify Windows 8 via platform.platform()
- Issue #16088: BaseHTTPRequestHandler's send_error method includes a
Content-Length header in it's response now. Patch by Antoine Pitrou.
- Issue #16114: The subprocess module no longer provides a misleading error
message stating that args[0] did not exist when either the cwd or executable
keyword arguments specified a path that did not exist.
- Issue #16169: Fix ctypes.WinError()'s confusion between errno and winerror.
- Issue #16110: logging.fileConfig now accepts a pre-initialised ConfigParser
instance.
- Issue #1492704: shutil.copyfile() raises a distinct SameFileError now if
source and destination are the same file. Patch by Atsuo Ishimoto.
- Issue #13896: Make shelf instances work with 'with' as context managers.
Original patch by Filip Gruszczyński.
- Issue #15417: Add support for csh and fish in venv activation scripts.
- Issue #14377: ElementTree.write and some of the module-level functions have
a new parameter - *short_empty_elements*. It controls how elements with no
contents are emitted.
- Issue #16089: Allow ElementTree.TreeBuilder to work again with a non-Element
element_factory (fixes a regression in SimpleTAL).
- Issue #9650: List commonly used format codes in time.strftime and
time.strptime docsttings. Original patch by Mike Hoy.
- Issue #15452: logging configuration socket listener now has a verify option
that allows an application to apply a verification function to the
received configuration data before it is acted upon.
- Issue #16034: Fix performance regressions in the new `bz2.BZ2File`
implementation. Initial patch by Serhiy Storchaka.
- `pty.spawn()` now returns the child process status returned by `os.waitpid()`.
- Issue #15756: `subprocess.poll()` now properly handles `errno.ECHILD` to
return a returncode of 0 when the child has already exited or cannot be waited
on.
- Issue #15323: Improve failure message of `Mock.assert_called_once_with()`.
- Issue #16064: ``unittest -m`` claims executable is "python", not "python3".
- Issue #12376: Pass on parameters in `TextTestResult.__init__()` super call.
- Issue #15222: Insert blank line after each message in mbox mailboxes.
- Issue #16013: Fix `csv.Reader` parsing issue with ending quote characters.
Patch by Serhiy Storchaka.
- Issue #15421: Fix an OverflowError in `Calendar.itermonthdates()` after
`datetime.MAXYEAR`. Patch by Cédric Krier.
- Issue #16112: platform.architecture does not correctly escape argument to
/usr/bin/file. Patch by David Benjamin.
- Issue #15970: `xml.etree.ElementTree` now serializes correctly the empty HTML
elements 'meta' and 'param'.
- Issue #15842: The `SocketIO.{readable,writable,seekable}` methods now raise
ValueError when the file-like object is closed. Patch by Alessandro Moura.
- Issue #15876: Fix a refleak in the `curses` module: window.encoding.
- Issue #15881: Fix `atexit` hook in `multiprocessing`. Original patch by Chris
McDonough.
- Issue #15841: The readable(), writable() and seekable() methods of
`io.BytesIO` and `io.StringIO` objects now raise ValueError when the object
has been closed. Patch by Alessandro Moura.
- Issue #15447: Use `subprocess.DEVNULL` in webbrowser, instead of opening
`os.devnull` explicitly and leaving it open.
- Issue #15509: `webbrowser.UnixBrowser` no longer passes empty arguments to
Popen when ``%action`` substitutions produce empty strings.
- Issue #12776, issue #11839: Call `argparse` type function (specified by
add_argument) only once. Before, the type function was called twice in the
case where the default was specified and the argument was given as well. This
was especially problematic for the FileType type, as a default file would
always be opened, even if a file argument was specified on the command line.
- Issue #15906: Fix a regression in argparse caused by the preceding change,
when ``action='append'``, ``type='str'`` and ``default=[]``.
- Issue #16113: Added sha3 module based on the Keccak reference implementation
3.2. The `hashlib` module has four additional hash algorithms: `sha3_224`,
`sha3_256`, `sha3_384` and `sha3_512`. As part of the patch some common
code was moved from _hashopenssl.c to hashlib.h.
- ctypes.call_commethod was removed, since its only usage was in the defunct
samples directory.
- Issue #16692: Added TLSv1.1 and TLSv1.2 support for the ssl modules.
- Issue #16832: add abc.get_cache_token() to expose cache validity checking
support in ABCMeta.
IDLE
----
- Issue #18429: Format / Format Paragraph, now works when comment blocks
are selected. As with text blocks, this works best when the selection
only includes complete lines.
- Issue #18226: Add docstrings and unittests for FormatParagraph.py.
Original patches by Todd Rovito and Phil Webster.
- Issue #18279: Format - Strip trailing whitespace no longer marks a file as
changed when it has not been changed. This fix followed the addition of a
test file originally written by Phil Webster (the issue's main goal).
- Issue #7136: In the Idle File menu, "New Window" is renamed "New File".
Patch by Tal Einat, Roget Serwy, and Todd Rovito.
- Remove dead imports of imp.
- Issue #18196: Avoid displaying spurious SystemExit tracebacks.
- Issue #5492: Avoid traceback when exiting IDLE caused by a race condition.
- Issue #17511: Keep IDLE find dialog open after clicking "Find Next".
Original patch by Sarah K.
- Issue #18055: Move IDLE off of imp and on to importlib.
- Issue #15392: Create a unittest framework for IDLE.
Initial patch by Rajagopalasarma Jayakrishnan.
See Lib/idlelib/idle_test/README.txt for how to run Idle tests.
- Issue #14146: Highlight source line while debugging on Windows.
- Issue #17838: Allow sys.stdin to be reassigned.
- Issue #13495: Avoid loading the color delegator twice in IDLE.
- Issue #17798: Allow IDLE to edit new files when specified on command line.
- Issue #14735: Update IDLE docs to omit "Control-z on Windows".
- Issue #17532: Always include Options menu for IDLE on OS X.
Patch by Guilherme Simões.
- Issue #17585: Fixed IDLE regression. Now closes when using exit() or quit().
- Issue #17657: Show full Tk version in IDLE's about dialog.
Patch by Todd Rovito.
- Issue #17613: Prevent traceback when removing syntax colorizer in IDLE.
- Issue #1207589: Backwards-compatibility patch for right-click menu in IDLE.
- Issue #16887: IDLE now accepts Cancel in tabify/untabify dialog box.
- Issue #17625: In IDLE, close the replace dialog after it is used.
- Issue #14254: IDLE now handles readline correctly across shell restarts.
- Issue #17614: IDLE no longer raises exception when quickly closing a file.
- Issue #6698: IDLE now opens just an editor window when configured to do so.
- Issue #8900: Using keyboard shortcuts in IDLE to open a file no longer
raises an exception.
- Issue #6649: Fixed missing exit status in IDLE. Patch by Guilherme Polo.
- Issue #17114: IDLE now uses non-strict config parser.
- Issue #9290: In IDLE the sys.std* streams now implement io.TextIOBase
interface and support all mandatory methods and properties.
- Issue #5066: Update IDLE docs. Patch by Todd Rovito.
- Issue #16829: IDLE printing no longer fails if there are spaces or other
special characters in the file path.
- Issue #16491: IDLE now prints chained exception tracebacks.
- Issue #16819: IDLE method completion now correctly works for bytes literals.
- Issue #16504: IDLE now catches SyntaxErrors raised by tokenizer. Patch by
Roger Serwy.
- Issue #16511: Use default IDLE width and height if config param is not valid.
Patch Serhiy Storchaka.
- Issue #1207589: Add Cut/Copy/Paste items to IDLE right click Context Menu
Patch by Todd Rovito.
- Issue #16123: IDLE - deprecate running without a subprocess.
Patch by Roger Serwy.
Tests
-----
- Issue #1666318: Add a test that shutil.copytree() retains directory
permissions. Patch by Catherine Devlin.
- Issue #18273: move the tests in Lib/test/json_tests to Lib/test/test_json
and make them discoverable by unittest. Patch by Zachary Ware.
- Fix a fcntl test case on KFreeBSD, Debian #708653 (Petr Salinger).
- Issue #18396: Fix spurious test failure in test_signal on Windows when
faulthandler is enabled (Patch by Jeremy Kloth)
- Issue #17046: Fix broken test_executable_without_cwd in test_subprocess.
- Issue #15415: Add new temp_dir() and change_cwd() context managers to
test.support, and refactor temp_cwd() to use them. Patch by Chris Jerdonek.
- Issue #15494: test.support is now a package rather than a module (Initial
patch by Indra Talip)
- Issue #17944: test_zipfile now discoverable and uses subclassing to
generate tests for different compression types. Fixed a bug with skipping
some tests due to use of exhausted iterators.
- Issue #18266: test_largefile now works with unittest test discovery and
supports running only selected tests. Patch by Zachary Ware.
- Issue #17767: test_locale now works with unittest test discovery.
Original patch by Zachary Ware.
- Issue #18375: Assume --randomize when --randseed is used for running the
testsuite.
- Issue #11185: Fix test_wait4 under AIX. Patch by Sébastien Sablé.
- Issue #18207: Fix test_ssl for some versions of OpenSSL that ignore seconds
in ASN1_TIME fields.
- Issue #18094: test_uuid no longer reports skipped tests as passed.
- Issue #17992: Add timeouts to asyncore and asynchat tests so that they won't
accidentally hang.
- Issue #17833: Fix test_gdb failures seen on machines where debug symbols
for glibc are available (seen on PPC64 Linux).
- Issue #7855: Add tests for ctypes/winreg for issues found in IronPython.
Initial patch by Dino Viehland.
- Issue #11078: test___all__ now checks for duplicates in __all__.
Initial patch by R. David Murray.
- Issue #17712: Fix test_gdb failures on Ubuntu 13.04.
- Issue #17835: Fix test_io when the default OS pipe buffer size is larger
than one million bytes.
- Issue #17065: Use process-unique key for winreg tests to avoid failures if
test is run multiple times in parallel (eg: on a buildbot host).
- Issue #12820: add tests for the xml.dom.minicompat module.
Patch by John Chandler and Phil Connell.
- Issue #17691: test_univnewlines now works with unittest test discovery.
Patch by Zachary Ware.
- Issue #17790: test_set now works with unittest test discovery.
Patch by Zachary Ware.
- Issue #17789: test_random now works with unittest test discovery.
Patch by Zachary Ware.
- Issue #17779: test_osx_env now works with unittest test discovery.
Patch by Zachary Ware.
- Issue #17766: test_iterlen now works with unittest test discovery.
Patch by Zachary Ware.
- Issue #17690: test_time now works with unittest test discovery.
Patch by Zachary Ware.
- Issue #17692: test_sqlite now works with unittest test discovery.
Patch by Zachary Ware.
- Issue #11995: test_pydoc doesn't import all sys.path modules anymore.
- Issue #17448: test_sax now skips if there are no xml parsers available
instead of raising an ImportError.
- Issue #11420: make test suite pass with -B/DONTWRITEBYTECODE set.
Initial patch by Thomas Wouters.
- Issue #10652: make tcl/tk tests run after __all__ test, patch by
Zachary Ware.
- Issue #11963: remove human verification from test_parser and test_subprocess.
- Issue #11732: add a new suppress_crash_popup() context manager to test.support
that disables crash popups on Windows and use it in test_faulthandler and
test_capi.
- Issue #13898: test_ssl no longer prints a spurious stack trace on Ubuntu.
- Issue #17283: Share code between `__main__.py` and `regrtest.py` in
`Lib/test`.
- Issue #17249: convert a test in test_capi to use unittest and reap threads.
- Issue #17107: Test client-side SNI support in urllib.request thanks to
the new server-side SNI support in the ssl module. Initial patch by
Daniel Black.
- Issue #17041: Fix testing when Python is configured with the
--without-doc-strings.
- Issue #16923: Fix ResourceWarnings in test_ssl.
- Issue #15539: Added regression tests for Tools/scripts/pindent.py.
- Issue #17479: test_io now works with unittest test discovery.
Patch by Zachary Ware.
- Issue #17066: test_robotparser now works with unittest test discovery.
Patch by Zachary Ware.
- Issue #17334: test_index now works with unittest test discovery.
Patch by Zachary Ware.
- Issue #17333: test_imaplib now works with unittest test discovery.
Patch by Zachary Ware.
- Issue #17082: test_dbm* now work with unittest test discovery.
Patch by Zachary Ware.
- Issue #17079: test_ctypes now works with unittest test discovery.
Patch by Zachary Ware.
- Issue #17304: test_hash now works with unittest test discovery.
Patch by Zachary Ware.
- Issue #17303: test_future* now work with unittest test discovery.
Patch by Zachary Ware.
- Issue #17163: test_file now works with unittest test discovery.
Patch by Zachary Ware.
- Issue #16925: test_configparser now works with unittest test discovery.
Patch by Zachary Ware.
- Issue #16918: test_codecs now works with unittest test discovery.
Patch by Zachary Ware.
- Issue #16919: test_crypt now works with unittest test discovery.
Patch by Zachary Ware.
- Issue #16910: test_bytes, test_unicode, and test_userstring now work with
unittest test discovery. Patch by Zachary Ware.
- Issue #16905: test_warnings now works with unittest test discovery.
Initial patch by Berker Peksag.
- Issue #16898: test_bufio now works with unittest test discovery.
Patch by Zachary Ware.
- Issue #16888: test_array now works with unittest test discovery.
Patch by Zachary Ware.
- Issue #16896: test_asyncore now works with unittest test discovery.
Patch by Zachary Ware.
- Issue #16897: test_bisect now works with unittest test discovery.
Initial patch by Zachary Ware.
- Issue #16852: test_genericpath, test_posixpath, test_ntpath, and test_macpath
now work with unittest test discovery. Patch by Zachary Ware.
- Issue #16748: test_heapq now works with unittest test discovery.
- Issue #10646: Tests rearranged for os.samefile/samestat to check for not
just symlinks but also hard links.
- Issue #15302: Switch regrtest from using getopt to using argparse.
- Issue #15324: Fix regrtest parsing of --fromfile, --match, and --randomize
options.
- Issue #16702: test_urllib2_localnet tests now correctly ignores proxies for
localhost tests.
- Issue #16664: Add regression tests for glob's behaviour concerning entries
starting with a ".". Patch by Sebastian Kreft.
- Issue #13390: The ``-R`` option to regrtest now also checks for memory
allocation leaks, using :func:`sys.getallocatedblocks()`.
- Issue #16559: Add more tests for the json module, including some from the
official test suite at json.org. Patch by Serhiy Storchaka.
- Issue #16661: Fix the `os.getgrouplist()` test by not assuming that it gives
the same output as :command:`id -G`.
- Issue #16115: Add some tests for the executable argument to
subprocess.Popen(). Initial patch by Kushal Das.
- Issue #16126: PyErr_Format format mismatch in _testcapimodule.c.
Patch by Serhiy Storchaka.
- Issue #15304: Fix warning message when `os.chdir()` fails inside
`test.support.temp_cwd()`. Patch by Chris Jerdonek.
- Issue #15802: Fix test logic in `TestMaildir.test_create_tmp()`. Patch by
Serhiy Storchaka.
- Issue #15557: Added a test suite for the webbrowser module, thanks to Anton
Barkovsky.
- Issue #16698: Skip posix test_getgroups when built with OS X
deployment target prior to 10.6.
Build
-----
- Issue #16067: Add description into MSI file to replace installer's
temporary name.
- Issue #18257: Fix readlink usage in python-config. Install the python
version again on Darwin.
- Issue #18481: Add C coverage reporting with gcov and lcov. A new make target
"coverage-report" creates an instrumented Python build, runs unit tests
and creates a HTML. The report can be updated with "make coverage-lcov".
- Issue #17845: Clarified the message printed when some module are not built.
- Issue #18256: Compilation fix for recent AIX releases. Patch by
David Edelsohn.
- Issue #17547: In configure, explicitly pass -Wformat for the benefit for GCC
4.8.
- Issue #15172: Document NASM 2.10+ as requirement for building OpenSSL 1.0.1
on Windows.
- Issue #17591: Use lowercase filenames when including Windows header files.
Patch by Roumen Petrov.
- Issue #17550: Fix the --enable-profiling configure switch.
- Issue #17425: Build with openssl 1.0.1d on Windows.
- Issue #16754: Fix the incorrect shared library extension on linux. Introduce
two makefile macros SHLIB_SUFFIX and EXT_SUFFIX. SO now has the value of
SHLIB_SUFFIX again (as in 2.x and 3.1). The SO macro is removed in 3.4.
- Issue #5033: Fix building of the sqlite3 extension module when the
SQLite library version has "beta" in it. Patch by Andreas Pelme.
- Issue #17228: Fix building without pymalloc.
- Issue #3718: Use AC_ARG_VAR to set MACHDEP in configure.ac.
- Issue #16235: Implement python-config as a shell script.
- Issue #16769: Remove outdated Visual Studio projects.
- Issue #17031: Fix running regen in cross builds.
- Issue #3754: fix typo in pthread AC_CACHE_VAL.
- Issue #15484: Fix _PYTHON_PROJECT_BASE for srcdir != builddir builds;
use _PYTHON_PROJECT_BASE in distutils/sysconfig.py.
- Drop support for Windows 2000 (changeset e52df05b496a).
- Issue #17029: Let h2py search the multiarch system include directory.
- Issue #16953: Fix socket module compilation on platforms with
HAVE_BROKEN_POLL. Patch by Jeffrey Armstrong.
- Issue #16320: Remove redundant Makefile dependencies for strings and bytes.
- Cross compiling needs host and build settings. configure no longer
creates a broken PYTHON_FOR_BUILD variable when --build is missing.
- Fix cross compiling issue in setup.py, ensure that lib_dirs and inc_dirs are
defined in cross compiling mode, too.
- Issue #16836: Enable IPv6 support even if IPv6 is disabled on the build host.
- Issue #16593: Have BSD 'make -s' do the right thing, thanks to Daniel Shahaf
- Issue #16262: fix out-of-src-tree builds, if mercurial is not installed.
- Issue #15298: ensure _sysconfigdata is generated in build directory, not
source directory.
- Issue #15833: Fix a regression in 3.3 that resulted in exceptions being
raised if importlib failed to write byte-compiled files. This affected
attempts to build Python out-of-tree from a read-only source directory.
- Issue #15923: Fix a mistake in ``asdl_c.py`` that resulted in a TypeError
after 2801bf875a24 (see #15801).
- Issue #16135: Remove OS/2 support.
- Issue #15819: Make sure we can build Python out-of-tree from a read-only
source directory. (Somewhat related to issue #9860.)
- Issue #15587: Enable Tk high-resolution text rendering on Macs with
Retina displays. Applies to Tkinter apps, such as IDLE, on OS X
framework builds linked with Cocoa Tk 8.5.
- Issue #17161: make install now also installs a python3 man page.
C-API
-----
- Issue #18351: Fix various issues in a function in importlib provided to help
PyImport_ExecCodeModuleWithPathnames() (and thus by extension
PyImport_ExecCodeModule() and PyImport_ExecCodeModuleEx()).
- Issue #9369: The types of `char*` arguments of PyObject_CallFunction() and
PyObject_CallMethod() now changed to `const char*`. Based on patches by
Jörg Müller and Lars Buitinck.
- Issue #17206: Py_CLEAR(), Py_DECREF(), Py_XINCREF() and Py_XDECREF() now
expand their arguments once instead of multiple times. Patch written by Illia
Polosukhin.
- Issue #17522: Add the PyGILState_Check() API.
- Issue #17327: Add PyDict_SetDefault.
- Issue #16881: Fix Py_ARRAY_LENGTH macro for GCC < 3.1.
- Issue #16505: Remove unused Py_TPFLAGS_INT_SUBCLASS.
- Issue #16086: PyTypeObject.tp_flags and PyType_Spec.flags are now unsigned
(unsigned long and unsigned int) to avoid an undefined behaviour with
Py_TPFLAGS_TYPE_SUBCLASS ((1 << 31). PyType_GetFlags() result type is
now unsigned too (unsigned long, instead of long).
- Issue #16166: Add PY_LITTLE_ENDIAN and PY_BIG_ENDIAN macros and unified
endianness detection and handling.
Documentation
-------------
- Issue #17701: Improving strftime documentation.
- Issue #18440: Clarify that `hash()` can truncate the value returned from an
object's custom `__hash__()` method.
- Issue #17844: Add links to encoders and decoders for bytes-to-bytes codecs.
- Issue #14097: improve the "introduction" page of the tutorial.
- Issue #17977: The documentation for the cadefault argument's default value
in urllib.request.urlopen() is fixed to match the code.
- Issue #6696: add documentation for the Profile objects, and improve
profile/cProfile docs. Patch by Tom Pinckney.
- Issue #15940: Specify effect of locale on time functions.
- Issue 17538: Document XML vulnerabilties
- Issue #16642: sched.scheduler timefunc initial default is time.monotonic.
Patch by Ramchandra Apte
- Issue #17047: remove doubled words in docs and docstrings
reported by Serhiy Storchaka and Matthew Barnett.
- Issue #15465: Document the versioning macros in the C API docs rather than
the standard library docs. Patch by Kushal Das.
- Issue #16406: Combine the pages for uploading and registering to PyPI.
- Issue #16403: Document how distutils uses the maintainer field in
PKG-INFO. Patch by Jyrki Pulliainen.
- Issue #16695: Document how glob handles filenames starting with a
dot. Initial patch by Jyrki Pulliainen.
- Issue #8890: Stop advertising an insecure practice by replacing uses
of the /tmp directory with better alternatives in the documentation.
Patch by Geoff Wilson.
- Issue #17203: add long option names to unittest discovery docs.
- Issue #13094: add "Why do lambdas defined in a loop with different values
all return the same result?" programming FAQ.
- Issue #14901: Update portions of the Windows FAQ.
Patch by Ashish Nitin Patil.
- Issue #16267: Better document the 3.3+ approach to combining
@abstractmethod with @staticmethod, @classmethod and @property
- Issue #15209: Clarify exception chaining description in exceptions module
documentation
- Issue #15990: Improve argument/parameter documentation.
- Issue #16209: Move the documentation for the str built-in function to a new
str class entry in the "Text Sequence Type" section.
- Issue #13538: Improve str() and object.__str__() documentation.
- Issue #16489: Make it clearer that importlib.find_loader() needs parent
packages to be explicitly imported.
- Issue #16400: Update the description of which versions of a given package
PyPI displays.
- Issue #15677: Document that zlib and gzip accept a compression level of 0 to
mean 'no compression'. Patch by Brian Brazil.
- Issue #16197: Update winreg docstrings and documentation to match code.
Patch by Zachary Ware.
- Issue #8040: added a version switcher to the documentation. Patch by
Yury Selivanov.
- Issue #16241: Document -X faulthandler command line option.
Patch by Marek Šuppa.
- Additional comments and some style changes in the concurrent.futures URL
retrieval example
- Issue #16115: Improve subprocess.Popen() documentation around args, shell,
and executable arguments.
- Issue #13498: Clarify docs of os.makedirs()'s exist_ok argument. Done with
great native-speaker help from R. David Murray.
- Issue #15533: Clarify docs and add tests for `subprocess.Popen()`'s cwd
argument.
- Issue #15979: Improve timeit documentation.
- Issue #16036: Improve documentation of built-in `int()`'s signature and
arguments.
- Issue #15935: Clarification of `argparse` docs, re: add_argument() type and
default arguments. Patch contributed by Chris Jerdonek.
- Issue #11964: Document a change in v3.2 to the behavior of the indent
parameter of json encoding operations.
- Issue #15116: Remove references to appscript as it is no longer being
supported.
Tools/Demos
-----------
- Issue #18817: Fix a resource warning in Lib/aifc.py demo. Patch by
Vajrasky Kok.
- Issue #18439: Make patchcheck work on Windows for ACKS, NEWS.
- Issue #18448: Fix a typo in Tools/demo/eiffel.py.
- Issue #18457: Fixed saving of formulas and complex numbers in
Tools/demo/ss1.py.
- Issue #18449: Make Tools/demo/ss1.py work again on Python 3. Patch by
Févry Thibault.
- Issue #12990: The "Python Launcher" on OSX could not launch python scripts
that have paths that include wide characters.
- Issue #15239: Make mkstringprep.py work again on Python 3.
- Issue #17028: Allowed Python arguments to be supplied to the Windows
launcher.
- Issue #17156: pygettext.py now detects the encoding of source files and
correctly writes and escapes non-ascii characters.
- Issue #15539: Fix a number of bugs in Tools/scripts/pindent.py. Now
pindent.py works with a "with" statement. pindent.py no longer produces
improper indentation. pindent.py now works with continued lines broken after
"class" or "def" keywords and with continuations at the start of line.
- Issue #11797: Add a 2to3 fixer that maps reload() to imp.reload().
- Issue #10966: Remove the concept of unexpected skipped tests.
- Issue #9893: Removed the Misc/Vim directory.
- Removed the Misc/TextMate directory.
- Issue #16245: Add the Tools/scripts/parse_html5_entities.py script to parse
the list of HTML5 entities and update the html.entities.html5 dictionary.
- Issue #15378: Fix Tools/unicode/comparecodecs.py. Patch by Serhiy Storchaka.
- Issue #16549: Make json.tool work again on Python 3 and add tests.
Initial patch by Berker Peksag and Serhiy Storchaka.
- Issue #13301: use ast.literal_eval() instead of eval() in Tools/i18n/msgfmt.py
Patch by Serhiy Storchaka.
Windows
-------
- Issue #18569: The installer now adds .py to the PATHEXT variable when extensions
are registered. Patch by Paul Moore.
**(For information about older versions, consult the HISTORY file.)**