库

• gh-118418 [https://github.com/python/cpython/issues/118418]: A DeprecationWarning is now emitted if you fail to pass a value to the new type_params parameter of typing._eval_type() or typing.ForwardRef._evaluate(). (Using either of these private and undocumented functions is discouraged to begin with, but failing to pass a value to the type_params parameter may lead to incorrect behaviour on Python 3.12 or newer.)

• gh-118660 [https://github.com/python/cpython/issues/118660]: Add an optional second type parameter to typing.ContextManager and typing.AsyncContextManager, representing the return types of __exit__() and __aexit__() respectively. This parameter defaults to bool | None.

• gh-118650 [https://github.com/python/cpython/issues/118650]: The enum module allows method named repr* to be defined on Enum types.

• gh-118648 [https://github.com/python/cpython/issues/118648]: Add type parameter defaults to typing.Generator and typing.AsyncGenerator.

• gh-101137 [https://github.com/python/cpython/issues/101137]: Mime type text/x-rst is now supported by mimetypes.

• gh-118164 [https://github.com/python/cpython/issues/118164]: The Python implementation of the decimal module could appear to hang in relatively small power cases (like 2**117) if context precision was set to a very high value. A different method to check for exactly representable results is used now that doesn't rely on computing 10**precision (which could be effectively too large to compute).

• gh-111744 [https://github.com/python/cpython/issues/111744]: breakpoint() and pdb.set_trace() now enter the debugger immediately after the call rather than before the next line is executed.

• gh-118500 [https://github.com/python/cpython/issues/118500]: Add pdb support for zipapps

• gh-118406 [https://github.com/python/cpython/issues/118406]: Add signature for sqlite3.Connection objects.

• gh-101732 [https://github.com/python/cpython/issues/101732]: Use a Y2038 compatible openssl time function when available.

• gh-118404 [https://github.com/python/cpython/issues/118404]: Fix inspect.signature() for non-comparable callables.

• gh-118402 [https://github.com/python/cpython/issues/118402]: Fix inspect.signature() for the result of the functools.cmp_to_key() call.

• gh-116622 [https://github.com/python/cpython/issues/116622]: On Android, sysconfig.get_platform now returns the format specified by PEP 738 [https://peps.python.org/pep-0738/].

• gh-118285 [https://github.com/python/cpython/issues/118285]: Allow to specify the signature of custom callable instances of extension type by the __textsignature_ attribute. Specify signatures of operator.attrgetter, operator.itemgetter, and operator.methodcaller instances.

• gh-118314 [https://github.com/python/cpython/issues/118314]: Fix an edge case in binascii.a2b_base64() strict mode, where excessive padding is not detected when no padding is necessary.

• gh-118271 [https://github.com/python/cpython/issues/118271]: Add the PhotoImage methods read() to read an image from a file and data() to get the image data. Add background and grayscale parameters to PhotoImage method write().

• gh-118225 [https://github.com/python/cpython/issues/118225]: Add the PhotoImage method copy_replace() to copy a region from one image to other image, possibly with pixel zooming and/or subsampling. Add from_coords parameter to PhotoImage methods copy(), zoom() and subsample(). Add zoom and subsample parameters to PhotoImage method copy().

• gh-118221 [https://github.com/python/cpython/issues/118221]: Fix a bug where sqlite3.Connection.iterdump() could fail if a custom row factory was used. Patch by Erlend Aasland.

• gh-118013 [https://github.com/python/cpython/issues/118013]: Fix regression introduced in gh-103193 [https://github.com/python/cpython/issues/103193] that meant that calling inspect.getattr_static() on an instance would cause a strong reference to that instance's class to persist in an internal cache in the inspect module. This caused unexpected memory consumption if the class was dynamically created, the class held strong references to other objects which took up a significant amount of memory, and the cache contained the sole strong reference to the class. The fix for the regression leads to a slowdown in getattr_static(), but the function should still be significantly faster than it was in Python 3.11. Patch by Alex Waygood.

• gh-118218 [https://github.com/python/cpython/issues/118218]: Speed up itertools.pairwise() in the common case by up to 1.8x.

• gh-117486 [https://github.com/python/cpython/issues/117486]: Improve the behavior of user-defined subclasses of ast.AST. Such classes will now require no changes in the usual case to conform with the behavior changes of the ast module in Python 3.13. Patch by Jelle Zijlstra.

• gh-90848 [https://github.com/python/cpython/issues/90848]: Fixed unittest.mock.create_autospec() to configure parent mock with keyword arguments.

• gh-118168 [https://github.com/python/cpython/issues/118168]: Fix incorrect argument substitution when typing.Unpack is used with the builtin tuple. typing.Unpack now raises TypeError when used with certain invalid types. Patch by Jelle Zijlstra.

• gh-118131 [https://github.com/python/cpython/issues/118131]: Add commandline interface for the random module. Patch by Hugo van Kemenade.

• gh-118107 [https://github.com/python/cpython/issues/118107]: Fix zipimport reading of ZIP64 files with file entries that are too big or offset too far.

• gh-102511 [https://github.com/python/cpython/issues/102511]: Fix os.path.normpath() for UNC paths on Windows. Speed up os.path.splitroot() with a native implementation.

• gh-117535 [https://github.com/python/cpython/issues/117535]: Change the unknown filename of warnings from sys to to clarify that it's not a real filename.

• gh-114053 [https://github.com/python/cpython/issues/114053]: Fix erroneous NameError when calling typing.get_type_hints() on a class that made use of PEP 695 [https://peps.python.org/pep-0695/] type parameters in a module that had from __future__ import annotations at the top of the file. Patch by Alex Waygood.

• gh-116931 [https://github.com/python/cpython/issues/116931]: Add parameter fileobj check for tarfile.TarFile.addfile()

• gh-117995 [https://github.com/python/cpython/issues/117995]: Don't raise DeprecationWarning when a sequence of parameters is used to bind indexed, nameless placeholders. See also gh-100668 [https://github.com/python/cpython/issues/100668].

• gh-80361 [https://github.com/python/cpython/issues/80361]: Fix TypeError in email.message.Message.get_payload() when the charset is RFC 2231 [https://datatracker.ietf.org/doc/html/rfc2231.html] encoded.

• gh-86650 [https://github.com/python/cpython/issues/86650]: Fix IndexError when parse some emails with invalid MessageID (including one-off addresses generated by Microsoft Outlook).

• gh-117691 [https://github.com/python/cpython/issues/117691]: Improve the error messages emitted by tarfile deprecation warnings relating to PEP 706. If a filter argument is not provided to extract() or extractall, the deprecation warning now points to the line in the user's code where the relevant function was called. Patch by Alex Waygood.

• gh-115874 [https://github.com/python/cpython/issues/115874]: Fixed a possible segfault during garbage collection of _asyncio.FutureIter objects. Patch by Savannah Ostrowski.

• gh-115060 [https://github.com/python/cpython/issues/115060]: Speed up pathlib.Path.glob() by omitting an initial is_dir() call. As a result of this change, glob() can no longer raise OSError.

• gh-77102 [https://github.com/python/cpython/issues/77102]: site module now parses .pth file with UTF-8 first, and locale encoding if UnicodeDecodeError happened. It supported only locale encoding before.

• gh-76785 [https://github.com/python/cpython/issues/76785]: We've exposed the low-level _interpreters module for the sake of the PyPI implementation of PEP 734 [https://peps.python.org/pep-0734/]. It was sometimes available as the _xxsubinterpreters module and was formerly used only for testing. For the most part, it should be considered an internal module, like _thread and _imp. See https://discuss.python.org/t/pep-734-multiple-interpreters-in-the-stdlib/41147/26.

• gh-115060 [https://github.com/python/cpython/issues/115060]: Speed up pathlib.Path.glob() by not scanning directories for non-wildcard pattern segments.

• gh-117727 [https://github.com/python/cpython/issues/117727]: Speed up pathlib.Path.iterdir() by using os.scandir() internally.

• gh-117586 [https://github.com/python/cpython/issues/117586]: Speed up pathlib.Path.walk() by working with strings internally.

• gh-117722 [https://github.com/python/cpython/issues/117722]: Change the new multi-separator support in asyncio.StreamReader.readuntil() to only accept tuples of separators rather than arbitrary iterables.

• gh-117692 [https://github.com/python/cpython/issues/117692]: Fixes a bug when doctest.DocTestFinder was failing on wrapped builtin_function_or_method.

• gh-117348 [https://github.com/python/cpython/issues/117348]: Largely restored import time performance of configparser by avoiding dataclasses.

• gh-117641 [https://github.com/python/cpython/issues/117641]: Speedup os.path.commonpath() on Unix.

• gh-117663 [https://github.com/python/cpython/issues/117663]: Fix simpleenum to detect aliases when multiple arguments are present but only one is the member value.

• gh-117636 [https://github.com/python/cpython/issues/117636]: Speedup os.path.join().

• gh-117618 [https://github.com/python/cpython/issues/117618]: Support package.module as filename for break command of pdb

• gh-102247 [https://github.com/python/cpython/issues/102247]: the status codes enum with constants in http.HTTPStatus are updated to include the names from RFC9110. This RFC includes some HTTP statuses previously only used for WEBDAV and assigns more generic names to them.

The old constants are preserved for backwards compatibility.

• gh-117607 [https://github.com/python/cpython/issues/117607]: Speedup os.path.relpath().

• gh-117586 [https://github.com/python/cpython/issues/117586]: Speed up pathlib.Path.glob() by working with strings internally.

• gh-117225 [https://github.com/python/cpython/issues/117225]: Add colour to doctest output. Patch by Hugo van Kemenade.

• gh-117566 [https://github.com/python/cpython/issues/117566]: ipaddress.IPv6Address.is_loopback() will now return True for IPv4-mapped loopback addresses, i.e. addresses in the ::ffff:127.0.0.0/104 address space.

• gh-117546 [https://github.com/python/cpython/issues/117546]: Fix issue where os.path.realpath() stopped resolving symlinks after encountering a symlink loop on POSIX.

• gh-116720 [https://github.com/python/cpython/issues/116720]: Improved behavior of asyncio.TaskGroup when an external cancellation collides with an internal cancellation. For example, when two task groups are nested and both experience an exception in a child task simultaneously, it was possible that the outer task group would misbehave, because its internal cancellation was swallowed by the inner task group.

In the case where a task group is cancelled externally and also must raise an ExceptionGroup, it will now call the parent task's cancel() method. This ensures that a asyncio.CancelledError will be raised at the next await, so the cancellation is not lost.

这些更改的一个附加好处是现在任务组会保留取消操作计数 (asyncio.Task.cancelling())。

为了处理某些边界情况，现在 asyncio.Task.uncancel() 可以在取消操作计数达到零时重置未写入文档的 mustcancel 旗标。

• gh-117516 [https://github.com/python/cpython/issues/117516]: Add typing.TypeIs, implementing PEP 742 [https://peps.python.org/pep-0742/]. Patch by Jelle Zijlstra.

• gh-117503 [https://github.com/python/cpython/issues/117503]: Fix support of nonASCII user names in bytes paths in os.path.expanduser() on Posix.

• gh-117394 [https://github.com/python/cpython/issues/117394]: os.path.ismount() is now 2-3 times faster if the user has permissions.

• gh-117313 [https://github.com/python/cpython/issues/117313]: Only treat '\n', '\r' and '\r\n' as line separators in re-folding the email messages. Preserve control characters '\v', '\f', '\x1c', '\x1d' and '\x1e' and Unicode line separators '\x85', '\u2028' and '\u2029' as is.

• gh-117142 [https://github.com/python/cpython/issues/117142]: Convert _ctypes to multiphase initialisation ( PEP 489 [https://peps.python.org/pep-0489/]).

• gh-66543 [https://github.com/python/cpython/issues/66543]: Add the mimetypes.guess_file_type() function which works with file path. Passing file path instead of URL in guess_type() is soft deprecated.

• gh-68583 [https://github.com/python/cpython/issues/68583]: webbrowser CLI: replace getopt with argparse, add long options. Patch by Hugo van Kemenade.

• gh-116871 [https://github.com/python/cpython/issues/116871]: Name suggestions for AttributeError and ImportError now only include underscored names if the original name was underscored.

• gh-116023 [https://github.com/python/cpython/issues/116023]: Don't show empty fields (value None or []) in ast.dump() by default. Add show_empty=False parameter to optionally show them.

• gh-115961 [https://github.com/python/cpython/issues/115961]: Added name and mode attributes for compressed and archived file-like objects in modules bz2, lzma, tarfile and zipfile. The value of the mode attribute of gzip.GzipFile was changed from integer (1 or 2) to string ('rb' or 'wb'). The value of the mode attribute of the readable file-like object returned by zipfile.ZipFile.open() was changed from 'r' to 'rb'.

• gh-82062 [https://github.com/python/cpython/issues/82062]: Fix inspect.signature() to correctly handle parameter defaults on methods in extension modules that use names defined in the module namespace.

• gh-83856 [https://github.com/python/cpython/issues/83856]: Honor atexit for all multiprocessing start methods

• gh-113081 [https://github.com/python/cpython/issues/113081]: Print colorized exception just like builtin traceback in pdb

• gh-112855 [https://github.com/python/cpython/issues/112855]: Speed up pickling of pathlib.PurePath objects. Patch by Barney Gale.

• gh-111744 [https://github.com/python/cpython/issues/111744]: Support opcode events in bdb

• gh-109617 [https://github.com/python/cpython/issues/109617]: ncurses: fixed a crash that could occur on macOS 13 or earlier when Python was built with Apple Xcode 15's SDK.

• gh-83151 [https://github.com/python/cpython/issues/83151]: Enabled arbitrary statements and evaluations in pdb shell to access the local variables of the current frame, which made it possible for multi-scope code like generators or nested function to work.

• gh-110209 [https://github.com/python/cpython/issues/110209]: Add __class_getitem__() to types.GeneratorType and types.CoroutineType for type hinting purposes. Patch by James Hilton-Balfe.

• gh-108191 [https://github.com/python/cpython/issues/108191]: The types.SimpleNamespace now accepts an optional positional argument which specifies initial values of attributes as a dict or an iterable of key-value pairs.

• gh-62090 [https://github.com/python/cpython/issues/62090]: Fix assertion errors caused by whitespace in metavars or SUPPRESS-ed groups in argparse by simplifying usage formatting. Patch by Ali Hamdan.

• gh-102402 [https://github.com/python/cpython/issues/102402]: Adjust logging.LogRecord to use time.time_ns() and fix minor bug related to floating-point math.

• gh-100242 [https://github.com/python/cpython/issues/100242]: Bring pure Python implementation functools.partial._new_ more in line with the C-implementation by not just always checking for the presence of the attribute 'func' on the first argument of partial. Instead, both the Python version and the C version perform an isinstance(func, partial) check on the first argument of partial.

• gh-99730 [https://github.com/python/cpython/issues/99730]: HEAD requests are no longer upgraded to GET request during redirects in urllib.

• gh-66410 [https://github.com/python/cpython/issues/66410]: Setting the tkinter module global wantobjects to 2 before creating the Tk object or call the wantobjects() method of the Tk object with argument 2 makes now arguments to callbacks registered in the tkinter module to be passed as various Python objects (int, float, bytes, tuple), depending on their internal representation in Tcl, instead of always str. tkinter.wantobjects is now set to 2 by default.

• bpo-40943 [https://bugs.python.org/issue?@action=redirect&bpo=40943]: Fix several IndexError when parse emails with truncated MessageID, address, routes, etc, e.g. example@.

• bpo-39324 [https://bugs.python.org/issue?@action=redirect&bpo=39324]: Add mime type mapping for .md <-> text/markdown

• bpo-18108 [https://bugs.python.org/issue?@action=redirect&bpo=18108]: shutil.chown() now supports dir_fd and follow_symlinks keyword arguments.

• bpo-30988 [https://bugs.python.org/issue?@action=redirect&bpo=30988]: Fix parsing of emails with invalid address headers having a leading or trailing dot. Patch by tsufeki.

• bpo-32839 [https://bugs.python.org/issue?@action=redirect&bpo=32839]: Add the after_info() method for Tkinter widgets.

文档

• gh-117928 [https://github.com/python/cpython/issues/117928]: The minimum Sphinx version required for the documentation is now 6.2.1.

构建

• gh-118734 [https://github.com/python/cpython/issues/118734]: Fixes Windows build when invoked directly (not through the build.bat script) without specifying a value for UseTIER2.

• gh-115119 [https://github.com/python/cpython/issues/115119]: The configure option --with-system-libmpdec now defaults to yes. The bundled copy of libmpdecimal will be removed in Python 3.15.

• gh-117845 [https://github.com/python/cpython/issues/117845]: Fix building against recent libedit versions by detecting readline hook signatures in configure.

• gh-116622 [https://github.com/python/cpython/issues/116622]: A testbed project was added to run the test suite on Android.

• gh-117645 [https://github.com/python/cpython/issues/117645]: Increase WASI stack size from 512 KiB to 8 MiB and the initial memory from 10 MiB to 20 MiB. Patch by Victor Stinner.

• gh-115119 [https://github.com/python/cpython/issues/115119]: configure now uses pkg-config to detect decimal dependencies if the --with-system-libmpdec option is given.

Windows

• gh-115119 [https://github.com/python/cpython/issues/115119]: Update Windows installer to use libmpdecimal 4.0.0.

• gh-118486 [https://github.com/python/cpython/issues/118486]: os.mkdir() now accepts mode of 0o700 to restrict the new directory to the current user.

• gh-118347 [https://github.com/python/cpython/issues/118347]: Fixes launcher updates not being installed.

• gh-118293 [https://github.com/python/cpython/issues/118293]: The multiprocessing module now passes the STARTF_FORCEOFFFEEDBACK flag when spawning processes to tell Windows not to change the mouse cursor.

• gh-115009 [https://github.com/python/cpython/issues/115009]: Update Windows installer to use SQLite 3.45.3.

• gh-90329 [https://github.com/python/cpython/issues/90329]: Suppress the warning displayed on virtual environment creation when the requested and created paths differ only by a short (8.3 style) name. Warnings will continue to be shown if a junction or symlink in the path caused the venv to be created in a different location than originally requested.

• gh-117786 [https://github.com/python/cpython/issues/117786]: Fixes virtual environments not correctly launching when created from a Store install.

macOS

• gh-115119 [https://github.com/python/cpython/issues/115119]: Update macOS installer to use libmpdecimal 4.0.0.

• gh-114099 [https://github.com/python/cpython/issues/114099]: iOS preprocessor symbol usage was made compatible with older macOS SDKs.

• gh-115009 [https://github.com/python/cpython/issues/115009]: Update macOS installer to use SQLite 3.45.3.

• gh-91629 [https://github.com/python/cpython/issues/91629]: Use ~/.config/fish/conf.d configs and fish_add_path to set PATH when installing for the Fish shell.

IDLE

• bpo-34774 [https://bugs.python.org/issue?@action=redirect&bpo=34774]: Use user-selected color theme for Help => IDLE Doc.

C API

• gh-118124 [https://github.com/python/cpython/issues/118124]: Fix Py_BUILD_ASSERT and Py_BUILD_ASSERT_EXPR for non-constant expressions: use static_assert() on C11 and newer. Patch by Victor Stinner.

• gh-110850 [https://github.com/python/cpython/issues/110850]: Add "Raw" variant of PyTime functions

  • PyTime_MonotonicRaw()

  • PyTime_PerfCounterRaw()

  • PyTime_TimeRaw()

Patch by Victor Stinner.

• gh-117987 [https://github.com/python/cpython/issues/117987]: Restore functions removed in Python 3.13 alpha 1:

  • Py_SetPythonHome()

  • Py_SetProgramName()

  • PySys_SetArgvEx()

  • PySys_SetArgv()

Patch by Victor Stinner.

• gh-117929 [https://github.com/python/cpython/issues/117929]: Restore removed PyEval_InitThreads() function. Patch by Victor Stinner.

• gh-117534 [https://github.com/python/cpython/issues/117534]: Improve validation logic in the C implementation of datetime.datetime.fromisoformat() to better handle invalid years. Patch by Vlad Efanov.

• gh-68114 [https://github.com/python/cpython/issues/68114]: Fixed skipitem()'s handling of the old 'w' and 'w#' formatters. These are no longer supported and now raise an exception if used.

• gh-111997 [https://github.com/python/cpython/issues/111997]: Add a C-API for firing monitoring events.

Python 3.13.0 alpha 6

Release date: 2024-04-09

核心与内置函数

• gh-117494 [https://github.com/python/cpython/issues/117494]: Refactored the instruction sequence data structure out of compile.c into instruction_sequence.c.

• gh-116968 [https://github.com/python/cpython/issues/116968]: Introduce a unified 16-bit backoff counter type (PyBackoffCounter), shared between the Tier 1 adaptive specializer and the Tier 2 optimizer. The API used for adaptive specialization counters is changed but the behavior is (supposed to be) identical.

The behavior of the Tier 2 counters is changed:

• There are no longer dynamic thresholds (we never varied these).

• All counters now use the same exponential backoff.

• The counter for JUMP_BACKWARD starts counting down from 16.

• The temperature in side exits starts counting down from 64.

• gh-117431 [https://github.com/python/cpython/issues/117431]: Improve the performance of the following bytes and bytearray methods by adapting them to the METH_FASTCALL calling convention:

  • endswith()

  • startswith()

• gh-117431 [https://github.com/python/cpython/issues/117431]: Improve the performance of the following str methods by adapting them to the METH_FASTCALL calling convention:

  • count()

  • endswith()

  • find()

  • index()

  • rfind()

  • rindex()

  • startswith()

• gh-117411 [https://github.com/python/cpython/issues/117411]: Move PyFutureFeatures to an internal header and make it private.

• gh-109120 [https://github.com/python/cpython/issues/109120]: Added handle of incorrect star expressions, e.g f(3, *). Patch by Grigoryev Semyon

• gh-117266 [https://github.com/python/cpython/issues/117266]: Fix crashes for certain user-created subclasses of ast.AST. Such classes are now expected to set the fieldtypes attribute.

• gh-99108 [https://github.com/python/cpython/issues/99108]: Updated the hashlib builtin HACL* project [https://github.com/hacl-star/hacl-star] C code from upstream that we use for many implementations when they are not present via OpenSSL in a given build. This also avoids the rare potential for a C symbol name one definition rule linking issue.

• gh-117108 [https://github.com/python/cpython/issues/117108]: Change the old space bit of objects in the young generation from 0 to gcstate->visited, so that any objects created during GC will have the old bit set correctly if they get moved into the old generation.

• gh-117108 [https://github.com/python/cpython/issues/117108]: The cycle GC now chooses the size of increments based on the total heap size, instead of the rate of object creation. This ensures that it can keep up with growing heaps.

• gh-116735 [https://github.com/python/cpython/issues/116735]: For INSTRUMENTED_CALL_FUNCTION_EX, set arg0 to sys.monitoring.MISSING instead of None for CALL event.

• gh-113964 [https://github.com/python/cpython/issues/113964]: Starting new threads and process creation through os.fork() are now only prevented once all non-daemon threads exit.

• gh-116626 [https://github.com/python/cpython/issues/116626]: Ensure INSTRUMENTED_CALL_FUNCTION_EX always emits CALL

• gh-116554 [https://github.com/python/cpython/issues/116554]: list.sort() now exploits more cases of partial ordering, particularly those with long descending runs with sub-runs of equal values. Those are recognized as single runs now (previously, each block of repeated values caused a new run to be created).

• gh-114099 [https://github.com/python/cpython/issues/114099]: Added a Loader that can discover extension modules in an iOS-style Frameworks folder.

• gh-115775 [https://github.com/python/cpython/issues/115775]: Compiler populates the new __static_attributes__ field on a class with the names of attributes of this class which are accessed through self.X from any function in its body.

• gh-115776 [https://github.com/python/cpython/issues/115776]: The array of values, the PyDictValues struct is now embedded in the object during allocation. This provides better performance in the common case, and does not degrade as much when the object's __dict__ is materialized.

• gh-108362 [https://github.com/python/cpython/issues/108362]: Implement an incremental cyclic garbage collector. By collecting the old generation in increments, there is no need for a full heap scan. This can hugely reduce maximum pause time for programs with large heaps.

Reduce the number of generations from three to two. The old generation is split into two spaces, "visited" and "pending".

Collection happens in two steps:: An increment is formed from the young generation and a small part of the pending space. This increment is scanned and the survivors moved to the end of the visited space.

When the collecting space becomes empty, the two spaces are swapped.

• gh-109870 [https://github.com/python/cpython/issues/109870]: Dataclasses now calls exec() once per dataclass, instead of once per method being added. This can speed up dataclass creation by up to 20%.

• gh-97901 [https://github.com/python/cpython/issues/97901]: Mime type text/rtf is now supported by mimetypes.

• bpo-24612 [https://bugs.python.org/issue?@action=redirect&bpo=24612]: Improve the SyntaxError that happens when 'not' appears after an operator. Patch by Pablo Galindo

库

• gh-117648 [https://github.com/python/cpython/issues/117648]: Improve performance of os.path.join() and os.path.expanduser().

• gh-117584 [https://github.com/python/cpython/issues/117584]: Raise TypeError for non-paths in posixpath.relpath().

• gh-117467 [https://github.com/python/cpython/issues/117467]: Preserve mailbox ownership when rewriting in mailbox.mbox.flush(). Patch by Tony Mountifield.

• gh-114848 [https://github.com/python/cpython/issues/114848]: Raise FileNotFoundError when getcwd() returns '(unreachable)', which can happen on Linux >= 2.6.36 with glibc < 2.27.

• gh-117459 [https://github.com/python/cpython/issues/117459]: asyncio.asyncio.run_coroutine_threadsafe() now keeps the traceback of CancelledError, TimeoutError and InvalidStateError which are raised in the coroutine.

• gh-117381 [https://github.com/python/cpython/issues/117381]: Fix error message for ntpath.commonpath().

• gh-117337 [https://github.com/python/cpython/issues/117337]: Deprecate undocumented glob.glob0() and glob.glob1() functions. Use glob.glob() and pass a directory to its root_dir argument instead.

• gh-117349 [https://github.com/python/cpython/issues/117349]: Optimise several functions in os.path.

• gh-117348 [https://github.com/python/cpython/issues/117348]: Refactored configparser.RawConfigParser._read() to reduce cyclometric complexity and improve comprehensibility.

• gh-117335 [https://github.com/python/cpython/issues/117335]: Raise TypeError for non-sequences for ntpath.commonpath().

• gh-66449 [https://github.com/python/cpython/issues/66449]: configparser.ConfigParser now accepts unnamed sections before named ones, if configured to do so.

• gh-88014 [https://github.com/python/cpython/issues/88014]: In documentation of gzip.GzipFile in module gzip, explain data type of optional constructor argument mtime, and recommend mtime = 0 for generating deterministic streams.

• gh-117310 [https://github.com/python/cpython/issues/117310]: Fixed an unlikely early & extra Py_DECREF triggered crash in ssl when creating a new ssl.SSLContext if CPython was built implausibly such that the default cipher list is empty or the SSL library it was linked against reports a failure from its C SSL_CTXsetcipher_list() API.

• gh-117294 [https://github.com/python/cpython/issues/117294]: A DocTestCase now reports as skipped if all examples in the doctest are skipped.

• gh-98966 [https://github.com/python/cpython/issues/98966]: In subprocess, raise a more informative message when stdout=STDOUT.

• gh-117225 [https://github.com/python/cpython/issues/117225]: doctest: only print "and X failed" when non-zero, don't pluralise "1 items". Patch by Hugo van Kemenade.

• gh-117205 [https://github.com/python/cpython/issues/117205]: Speed up compileall.compile_dir() by 20% when using multiprocessing by increasing chunksize.

• gh-117178 [https://github.com/python/cpython/issues/117178]: Fix regression in lazy loading of self-referential modules, introduced in gh-114781 [https://github.com/python/cpython/issues/114781].

• gh-112383 [https://github.com/python/cpython/issues/112383]: Fix dis module's handling of ENTER_EXECUTOR instructions.

• gh-117182 [https://github.com/python/cpython/issues/117182]: Lazy-loading of modules that modify their own __class__ no longer reverts the __class__ to types.ModuleType.

• gh-117084 [https://github.com/python/cpython/issues/117084]: Fix zipfile extraction for directory entries with the name containing backslashes on Windows.

• gh-117114 [https://github.com/python/cpython/issues/117114]: Make os.path.isdevdrive() available on all platforms. For those that do not offer Dev Drives, it will always return False.

• gh-117110 [https://github.com/python/cpython/issues/117110]: Fix a bug that prevents subclasses of typing.Any to be instantiated with arguments. Patch by Chris Fu.

• gh-109653 [https://github.com/python/cpython/issues/109653]: Deferred select imports in importlib.metadata and importlib.resources for a 14% speedup.

• gh-70647 [https://github.com/python/cpython/issues/70647]: Start the deprecation period for the current behavior of datetime.datetime.strptime() and time.strptime() which always fails to parse a date string with a ValueError involving a day of month such as strptime("02-29", "%m-%d") when a year is not specified and the date happen to be February 29th. This should help avoid users finding new bugs every four years due to a natural mistaken assumption about the API when parsing partial date values.

• gh-116987 [https://github.com/python/cpython/issues/116987]: Fixed inspect.findsource() for class code objects.

• gh-114099 [https://github.com/python/cpython/issues/114099]: Modify standard library to allow for iOS platform differences.

• gh-90872 [https://github.com/python/cpython/issues/90872]: On Windows, subprocess.Popen.wait() no longer calls WaitForSingleObject() with a negative timeout: pass 0 ms if the timeout is negative. Patch by Victor Stinner.

• gh-116957 [https://github.com/python/cpython/issues/116957]: configparser: Don't leave ConfigParser values in an invalid state (stored as a list instead of a str) after an earlier read raised DuplicateSectionError or DuplicateOptionError.

• gh-115538 [https://github.com/python/cpython/issues/115538]: _io.WindowsConsoleIO now emit a warning if a boolean value is passed as a filedescriptor argument.

• gh-90095 [https://github.com/python/cpython/issues/90095]: Ignore empty lines and comments in .pdbrc

• gh-106531 [https://github.com/python/cpython/issues/106531]: Refreshed zipfile._path from zipp 3.18 [https://zipp.readthedocs.io/en/latest/history.html#v3-18-0], providing better compatibility for PyPy, better glob performance for deeply nested zipfiles, and providing internal access to CompleteDirs.inject for use in other tests (like importlib.resources).

• gh-63207 [https://github.com/python/cpython/issues/63207]: On Windows, time.time() now uses the GetSystemTimePreciseAsFileTime() clock to have a resolution better than 1 us, instead of the GetSystemTimeAsFileTime() clock which has a resolution of 15.6 ms. Patch by Victor Stinner.

• gh-116764 [https://github.com/python/cpython/issues/116764]: Restore support of None and other false values in urllib.parse functions parse_qs() and parse_qsl(). Also, they now raise a TypeError for non-zero integers and non-empty sequences.

• gh-116811 [https://github.com/python/cpython/issues/116811]: In PathFinder.invalidate_caches, delegate to MetadataPathFinder.invalidate_caches.

• gh-116647 [https://github.com/python/cpython/issues/116647]: Fix recursive child in dataclasses

• gh-113171 [https://github.com/python/cpython/issues/113171]: Fixed various false positives and false negatives in

  • ipaddress.IPv4Address.is_private (see these docs for details)

  • ipaddress.IPv4Address.is_global

  • ipaddress.IPv6Address.is_private

  • ipaddress.IPv6Address.is_global

Also in the corresponding ipaddress.IPv4Network and ipaddress.IPv6Network attributes.

• gh-63283 [https://github.com/python/cpython/issues/63283]: In encodings.idna, any capitalization of the ACE prefix (xn--) is now acceptable. Patch by Pepijn de Vos and Zackery Spytz.

• gh-71042 [https://github.com/python/cpython/issues/71042]: Add platform.android_ver(), which provides device and OS information on Android.

• gh-73468 [https://github.com/python/cpython/issues/73468]: Added new math.fma() function, wrapping C99's fma() operation: fused multiply-add function. Patch by Mark Dickinson and Victor Stinner.

• gh-116608 [https://github.com/python/cpython/issues/116608]: The importlib.resources functions is_resource(), open_binary(), open_text(), path(), read_binary(), and read_text() are undeprecated, and support subdirectories via multiple positional arguments. The contents() function also allows subdirectories, but remains deprecated.

• gh-116484 [https://github.com/python/cpython/issues/116484]: Change automatically generated tkinter.Checkbutton widget names to avoid collisions with automatically generated tkinter.ttk.Checkbutton widget names within the same parent widget.

• gh-114314 [https://github.com/python/cpython/issues/114314]: In ctypes, ctype data is now stored in type objects directly rather than in a dict subclass. This is an internal change that should not affect usage.

• gh-116401 [https://github.com/python/cpython/issues/116401]: Fix blocking os.fwalk() and shutil.rmtree() on opening named pipe.

• gh-71052 [https://github.com/python/cpython/issues/71052]: Implement ctypes.util.find_library() on Android.

• gh-90535 [https://github.com/python/cpython/issues/90535]: Fix support of interval values > 1 in logging.TimedRotatingFileHandler for when='MIDNIGHT' and when='Wx'.

• gh-113308 [https://github.com/python/cpython/issues/113308]: Remove some internal protected parts from uuid: hasuuidgeneratetime_safe, netbiosgetnode, ipconfiggetnode, and loadsystem_functions. They were unused.

• gh-115627 [https://github.com/python/cpython/issues/115627]: Fix the ssl module error handling of connection terminate by peer. It now throws an OSError with the appropriate error code instead of an EOFError.

• gh-114847 [https://github.com/python/cpython/issues/114847]: Speed up os.path.realpath() on non-Windows platforms.

• gh-114271 [https://github.com/python/cpython/issues/114271]: Fix a race in threading.Thread.join().

threading._MainThread now always represents the main thread of the main interpreter.

PyThreadState.on_delete and PyThreadState.on_delete_data have been removed.

• gh-113538 [https://github.com/python/cpython/issues/113538]: Add asyncio.Server.close_clients() and asyncio.Server.abort_clients() methods which allow to more forcefully close an asyncio server.

• gh-85287 [https://github.com/python/cpython/issues/85287]: Changes Unicode codecs to return UnicodeEncodeError or UnicodeDecodeError, rather than just UnicodeError.

• gh-113548 [https://github.com/python/cpython/issues/113548]: pdb now allows CLI arguments to pdb -m.

• gh-112948 [https://github.com/python/cpython/issues/112948]: Make completion of pdb similar to Python REPL

• gh-105866 [https://github.com/python/cpython/issues/105866]: Fixed getslots bug which caused error when defining dataclasses with slots and a weakref_slot.

• gh-96471 [https://github.com/python/cpython/issues/96471]: Add asyncio.Queue termination with shutdown() method.

• gh-89739 [https://github.com/python/cpython/issues/89739]: The zipimport module can now read ZIP64 files.

• bpo-33533 [https://bugs.python.org/issue?@action=redirect&bpo=33533]: asyncio.as_completed() now returns an object that is both an asynchronous iterator and plain iterator. The new asynchronous iteration pattern allows for easier correlation between prior tasks and their completed results. This is a closer match to concurrent.futures.as_completed()'s iteration pattern. Patch by Justin Arthur.

• bpo-27578 [https://bugs.python.org/issue?@action=redirect&bpo=27578]: inspect.getsource() (and related functions) work with empty module files, returning '\n' (or reasonable equivalent) instead of raising OSError. Patch by Kernc.

• bpo-37141 [https://bugs.python.org/issue?@action=redirect&bpo=37141]: Accept an iterable of separators in asyncio.StreamReader.readuntil(), stopping when one of them is encountered.

• gh-66543 [https://github.com/python/cpython/issues/66543]: Make mimetypes.guess_type() properly parsing of URLs with only a host name, URLs containing fragment or query, and filenames with only a UNC sharepoint on Windows. Based on patch by Donghee Na.

• bpo-15010 [https://bugs.python.org/issue?@action=redirect&bpo=15010]: unittest.TestLoader.discover() now saves the original value of unittest.TestLoader._top_level_dir and restores it at the end of the call.

文档

• gh-115977 [https://github.com/python/cpython/issues/115977]: Remove compatibility references to Emscripten.

• gh-114099 [https://github.com/python/cpython/issues/114099]: Add an iOS platform guide, and flag modules not available on iOS.

• gh-91565 [https://github.com/python/cpython/issues/91565]: Changes to documentation files and config outputs to reflect the new location for reporting bugs - i.e. GitHub rather than bugs.python.org.

测试

• gh-83434 [https://github.com/python/cpython/issues/83434]: Disable JUnit XML output (--junit-xml=FILE command line option) in regrtest when hunting for reference leaks (-R option). Patch by Victor Stinner.

• gh-117187 [https://github.com/python/cpython/issues/117187]: Fix XML tests for vanilla Expat <2.6.0.

• gh-116333 [https://github.com/python/cpython/issues/116333]: Tests of TLS related things (error codes, etc) were updated to be more lenient about specific error message strings and behaviors as seen in the BoringSSL and AWS-LC forks of OpenSSL.

• gh-117089 [https://github.com/python/cpython/issues/117089]: Consolidated tests for importlib.metadata in their own metadata package.

• gh-115979 [https://github.com/python/cpython/issues/115979]: Update test_importlib so that it passes under WASI SDK 21.

• gh-112536 [https://github.com/python/cpython/issues/112536]: Add —tsan to test.regrtest for running TSAN tests in reasonable execution times. Patch by Donghee Na.

• gh-116307 [https://github.com/python/cpython/issues/116307]: Added import helper isolated_modules as CleanImport does not remove modules imported during the context. Use it in importlib.resources tests to avoid leaving mod around to impede importlib.metadata tests.

构建

• gh-114736 [https://github.com/python/cpython/issues/114736]: Have WASI builds use WASI SDK 21.

• gh-115983 [https://github.com/python/cpython/issues/115983]: Skip building test modules that must be built as shared under WASI.

• gh-71052 [https://github.com/python/cpython/issues/71052]: Add Android build script and instructions.

Windows

• gh-117267 [https://github.com/python/cpython/issues/117267]: Ensure DirEntry.stat().st_ctime behaves consistently with os.stat() during the deprecation period of st_ctime by containing the same value as st_birthtime. After the deprecation period, st_ctime will be the metadata change time (or unavailable through DirEntry), and only st_birthtime will contain the creation time.

• gh-116195 [https://github.com/python/cpython/issues/116195]: Improves performance of os.getppid() by using an alternate system API when available. Contributed by vxiiduu.

• gh-88494 [https://github.com/python/cpython/issues/88494]: On Windows, time.monotonic() now uses the QueryPerformanceCounter() clock to have a resolution better than 1 us, instead of the GetTickCount64() clock which has a resolution of 15.6 ms. Patch by Victor Stinner.

• gh-116773 [https://github.com/python/cpython/issues/116773]: Fix instances of <_overlapped.Overlapped object at 0xXXX> still has pending operation at deallocation, the process may crash.

• gh-91227 [https://github.com/python/cpython/issues/91227]: Fix the asyncio ProactorEventLoop implementation so that sending a datagram to an address that is not listening does not prevent receiving any more datagrams.

• gh-115119 [https://github.com/python/cpython/issues/115119]: Switched from vendored libmpdecimal code to a separately-hosted external package in the cpython-source-deps repository when building the _decimal module.

C API

• gh-117642 [https://github.com/python/cpython/issues/117642]: Fix PEP 737 [https://peps.python.org/pep-0737/] implementation for %#T and %#N.

• gh-87193 [https://github.com/python/cpython/issues/87193]: PyBytesResize() can now be called for bytes objects with reference count > 1, including 1-byte bytes objects. It creates a new bytes object and destroys the old one if it has reference count > 1.

• gh-117021 [https://github.com/python/cpython/issues/117021]: Fix integer overflow in PyLong_AsPid() on non-Windows 64-bit platforms.

• gh-115756 [https://github.com/python/cpython/issues/115756]: PyCode_GetFirstFree() is an ustable API now and has been renamed to PyUnstable_Code_GetFirstFree(). (Contributed by Bogdan Romanyuk in gh-115781 [https://github.com/python/cpython/issues/115781])

• gh-116869 [https://github.com/python/cpython/issues/116869]: Add test_cext test: build a C extension to check if the Python C API emits C compiler warnings. Patch by Victor Stinner.

• gh-116869 [https://github.com/python/cpython/issues/116869]: Make the C API compatible with -Werror=declaration-after-statement compiler flag again. Patch by Victor Stinner.

• gh-116936 [https://github.com/python/cpython/issues/116936]: Add PyType_GetModuleByDef() to the limited C API. Patch by Victor Stinner.

• gh-116809 [https://github.com/python/cpython/issues/116809]: Restore removed private PyErrChainExceptions1() function. Patch by Victor Stinner.

• gh-115754 [https://github.com/python/cpython/issues/115754]: In the limited C API version 3.13, getting Py_None, Py_False, Py_True, Py_Ellipsis and Py_NotImplemented singletons is now implemented as function calls at the stable ABI level to hide implementation details. Getting these constants still return borrowed references. Patch by Victor Stinner.

• gh-115754 [https://github.com/python/cpython/issues/115754]: Add Py_GetConstant() and Py_GetConstantBorrowed() functions to get constants. For example, Py_GetConstant(Py_CONSTANT_ZERO) returns a strong reference to the constant zero. Patch by Victor Stinner.

• gh-111696 [https://github.com/python/cpython/issues/111696]: Add support for %T, %T#, %N and %N# formats to PyUnicode_FromFormat(): format the fully qualified name of an object type and of a type: call PyType_GetModuleName(). See PEP 737 [https://peps.python.org/pep-0737/] for more information. Patch by Victor Stinner.

• gh-111696 [https://github.com/python/cpython/issues/111696]: Add PyType_GetModuleName() function to get the type's module name. Equivalent to getting the type.__module__ attribute. Patch by Eric Snow and Victor Stinner.

• gh-111696 [https://github.com/python/cpython/issues/111696]: Add PyType_GetFullyQualifiedName() function to get the type's fully qualified name. Equivalent to f"{type.__module__}.{type.__qualname__}", or type.__qualname__ if type.__module__ is not a string or is equal to "builtins". Patch by Victor Stinner.

• gh-85283 [https://github.com/python/cpython/issues/85283]: The fcntl, grp, pwd, termios, _statistics and _testconsole C extensions are now built with the limited C API. Patch by Victor Stinner.

• gh-111140 [https://github.com/python/cpython/issues/111140]: Add additional flags to PyLong_AsNativeBytes() and PyLong_FromNativeBytes() to allow the caller to determine how to handle edge cases around values that fill the entire buffer.

• gh-113024 [https://github.com/python/cpython/issues/113024]: Add PyObject_GenericHash() function.

Python 3.13.0 alpha 5

Release date: 2024-03-12

安全性

• gh-115398 [https://github.com/python/cpython/issues/115398]: Allow controlling Expat >=2.6.0 reparse deferral ( CVE 2023-52425 [https://www.cve.org/CVERecord?id=CVE-2023-52425]) by adding five new methods:

  • xml.etree.ElementTree.XMLParser.flush()

  • xml.etree.ElementTree.XMLPullParser.flush()

  • xml.parsers.expat.xmlparser.GetReparseDeferralEnabled()

  • xml.parsers.expat.xmlparser.SetReparseDeferralEnabled()

  • xml.sax.expatreader.ExpatParser.flush()

• gh-114572 [https://github.com/python/cpython/issues/114572]: ssl.SSLContext.cert_store_stats() and ssl.SSLContext.get_ca_certs() now correctly lock access to the certificate store, when the ssl.SSLContext is shared across multiple threads.

核心与内置函数

• gh-116604 [https://github.com/python/cpython/issues/116604]: Respect the status of the garbage collector when indirect calls are made via PyErr_CheckSignals() and the evaluation breaker. Patch by Pablo Galindo

• gh-112087 [https://github.com/python/cpython/issues/112087]: list is now compatible with the implementation of PEP 703 [https://peps.python.org/pep-0703/].

• gh-116381 [https://github.com/python/cpython/issues/116381]: Add specialization for CONTAINS_OP.

• gh-116296 [https://github.com/python/cpython/issues/116296]: Fix possible refleak in object.__reduce__() internal error handling.

• gh-115823 [https://github.com/python/cpython/issues/115823]: Properly calculate error ranges in the parser when raising SyntaxError exceptions caused by invalid byte sequences. Patch by Pablo Galindo

• gh-115778 [https://github.com/python/cpython/issues/115778]: Add tierN annotation for instruction definition in interpreter DSL.

• gh-115733 [https://github.com/python/cpython/issues/115733]: Fix crash when calling next() on exhausted list iterators.

• gh-115700 [https://github.com/python/cpython/issues/115700]: The regen-cases build stage now works on Windows.

• gh-115347 [https://github.com/python/cpython/issues/115347]: Fix bug where docstring was replaced by a redundant NOP when Python is run with -OO.

• gh-115323 [https://github.com/python/cpython/issues/115323]: Make error message more meaningful for when bytearray.extend() is called with a str object.

• gh-112175 [https://github.com/python/cpython/issues/112175]: Every PyThreadState now has its own eval_breaker, allowing specific threads to be interrupted.

• gh-115154 [https://github.com/python/cpython/issues/115154]: Fix a bug that was causing the tokenize.untokenize() function to handle unicode named literals incorrectly. Patch by Pablo Galindo

• gh-112433 [https://github.com/python/cpython/issues/112433]: Add ability to force alignment of ctypes.Structure by way of the new align attribute on the class.

• gh-104090 [https://github.com/python/cpython/issues/104090]: The multiprocessing resource tracker now exits with non-zero status code if a resource leak was detected. It still exits with status code 0 otherwise.

• gh-105858 [https://github.com/python/cpython/issues/105858]: Improve the constructors for ast nodes. Arguments of list types now default to an empty list if omitted, and optional fields default to None. AST nodes now have an __annotations__ attribute with the expected types of their attributes. Passing unrecognized extra arguments to AST nodes is deprecated and will become an error in Python 3.15. Omitting a required argument to an AST node is deprecated and will become an error in Python 3.15. Patch by Jelle Zijlstra.

• gh-101860 [https://github.com/python/cpython/issues/101860]: Expose __name__ attribute on property.

• gh-96497 [https://github.com/python/cpython/issues/96497]: Fix incorrect resolution of mangled class variables used in assignment expressions in comprehensions.

库

• gh-116600 [https://github.com/python/cpython/issues/116600]: Fix repr() for global Flag members.

• gh-116349 [https://github.com/python/cpython/issues/116349]: platform.java_ver() is deprecated and will be removed in 3.15. It was largely untested, had a confusing API, and was only useful for Jython support.

• gh-116143 [https://github.com/python/cpython/issues/116143]: Fix a race in pydoc startserver, eliminating a window in which startserver can return a thread that is "serving" but without a docserver set.

• gh-116127 [https://github.com/python/cpython/issues/116127]: typing: implement PEP 705 [https://peps.python.org/pep-0705/] which adds typing.ReadOnly support to typing.TypedDict.

• gh-116325 [https://github.com/python/cpython/issues/116325]: typing: raise SyntaxError instead of AttributeError on forward references as empty strings.

• gh-115957 [https://github.com/python/cpython/issues/115957]: When asyncio.TaskGroup.create_task is called on an inactive asyncio.TaskGroup, the given coroutine will be closed (which prevents a RuntimeWarning).

• gh-115978 [https://github.com/python/cpython/issues/115978]: Disable preadv(), readv(), pwritev(), and writev() on WASI.

Under wasmtime for WASI 0.2, these functions don't pass test_posix (https://github.com/bytecodealliance/wasmtime/issues/7830).

• gh-88352 [https://github.com/python/cpython/issues/88352]: Fix the computation of the next rollover time in the logging.TimedRotatingFileHandler handler. computeRollover() now always returns a timestamp larger than the specified time and works correctly during the DST change. doRollover() no longer overwrite the already rolled over file, saving from data loss when run at midnight or during repeated time at the DST change.

• gh-87115 [https://github.com/python/cpython/issues/87115]: Set __main__.__spec__ to None when running a script with pdb

• gh-76511 [https://github.com/python/cpython/issues/76511]: Fix UnicodeEncodeError in email.Message.as_string() that results when a message that claims to be in the ascii character set actually has nonascii characters. Nonascii characters are now replaced with the U+FFFD replacement character, like in the replace error handler.

• gh-89547 [https://github.com/python/cpython/issues/89547]: Add support for nested typing special forms like Final[ClassVar[int]].

• gh-65824 [https://github.com/python/cpython/issues/65824]: Improve the less prompt in pydoc.

• gh-116040 [https://github.com/python/cpython/issues/116040]: [Enum] fix by-value calls when second value is falsey; e.g. Cardinal(1, 0)

• gh-115821 [https://github.com/python/cpython/issues/115821]: [Enum] Improve error message when calling super().new() in custom new.

• gh-85644 [https://github.com/python/cpython/issues/85644]: Use the XDG_CURRENT_DESKTOP environment variable in webbrowser to check desktop. Prefer it to the deprecated GNOME_DESKTOP_SESSION_ID for GNOME detection.

• gh-75988 [https://github.com/python/cpython/issues/75988]: Fixed unittest.mock.create_autospec() to pass the call through to the wrapped object to return the real result.

• gh-115881 [https://github.com/python/cpython/issues/115881]: Fix issue where ast.parse() would incorrectly flag conditional context managers (such as with (x() if y else z()): …) as invalid syntax if feature_version=(3, 8) was passed. This reverts changes to the grammar made as part of gh-94949 [https://github.com/python/cpython/issues/94949].

• gh-115886 [https://github.com/python/cpython/issues/115886]: Fix silent truncation of the name with an embedded null character in multiprocessing.shared_memory.SharedMemory.

• gh-115532 [https://github.com/python/cpython/issues/115532]: Add kernel density estimation to the statistics module.

• gh-115714 [https://github.com/python/cpython/issues/115714]: On WASI, the time module no longer get process time using times() or CLOCK_PROCESS_CPUTIME_ID, system API is that is unreliable and is likely to be removed from WASI. The affected clock functions fall back to calling clock().

• gh-115809 [https://github.com/python/cpython/issues/115809]: Improve algorithm for computing which rolled-over log files to delete in logging.TimedRotatingFileHandler. It is now reliable for handlers without namer and with arbitrary deterministic namer that leaves the datetime part in the file name unmodified.

• gh-74668 [https://github.com/python/cpython/issues/74668]: urllib.parse functions parse_qs() and parse_qsl() now support bytes arguments containing raw and percent-encoded nonASCII data.

• gh-67044 [https://github.com/python/cpython/issues/67044]: csv.writer() now always quotes or escapes '\r' and '\n', regardless of lineterminator value.

• gh-115712 [https://github.com/python/cpython/issues/115712]: Restore support of space delimiter with skipinitialspace=True in csv. csv.writer() now quotes empty fields if delimiter is a space and skipinitialspace is true and raises exception if quoting is not possible.

• gh-112364 [https://github.com/python/cpython/issues/112364]: Fixed ast.unparse() to handle format_spec with ", ' or \. Patched by Frank Hoffmann.

• gh-112997 [https://github.com/python/cpython/issues/112997]: Stop logging potentially sensitive callback arguments in asyncio unless debug mode is active.

• gh-114914 [https://github.com/python/cpython/issues/114914]: Fix an issue where an abandoned StreamWriter would not be garbage collected.

• gh-111358 [https://github.com/python/cpython/issues/111358]: Fix a bug in asyncio.BaseEventLoop.shutdown_default_executor() to ensure the timeout passed to the coroutine behaves as expected.

• gh-115618 [https://github.com/python/cpython/issues/115618]: Fix improper decreasing the reference count for None argument in property methods getter(), setter() and deleter().

• gh-112720 [https://github.com/python/cpython/issues/112720]: Refactor dis.ArgResolver to make it possible to subclass and change the way jump args are interpreted.

• gh-112006 [https://github.com/python/cpython/issues/112006]: Fix inspect.unwrap() for types with the __wrapper__ data descriptor. Fix inspect.Signature.from_callable() for builtins classmethod() and staticmethod().

• gh-101293 [https://github.com/python/cpython/issues/101293]: Support callables with the __call__() method and types with _new_() and __init__() methods set to class methods, static methods, bound methods, partial functions, and other types of methods and descriptors in inspect.Signature.from_callable().

• gh-103092 [https://github.com/python/cpython/issues/103092]: Isolate _lsprof (apply PEP 687 [https://peps.python.org/pep-0687/]).

• gh-113942 [https://github.com/python/cpython/issues/113942]: pydoc no longer skips global functions implemented as builtin methods, such as MethodDescriptorType and WrapperDescriptorType.

• gh-115256 [https://github.com/python/cpython/issues/115256]: Added DeprecationWarning when accessing the tarfile attribute of TarInfo objects. The attribute is never used internally and is only attached to TarInfos when the tarfile is opened in write-mode, not read-mode. The attribute creates an unnecessary reference cycle which may cause corruption when not closing the handle after writing a tarfile.

• gh-115197 [https://github.com/python/cpython/issues/115197]: urllib.request no longer resolves the hostname before checking it against the system's proxy bypass list on macOS and Windows.

• gh-113812 [https://github.com/python/cpython/issues/113812]: DatagramTransport.sendto() will now send zero-length datagrams if called with an empty bytes object. The transport flow control also now accounts for the datagram header when calculating the buffer size.

• gh-114763 [https://github.com/python/cpython/issues/114763]: Protect modules loaded with importlib.util.LazyLoader from race conditions when multiple threads try to access attributes before the loading is complete.

• gh-114709 [https://github.com/python/cpython/issues/114709]: posixpath.commonpath() now raises a ValueError exception when passed an empty iterable. Previously, IndexError was raised.

posixpath.commonpath() now raises a TypeError exception when passed None. Previously, ValueError was raised.

• gh-114610 [https://github.com/python/cpython/issues/114610]: Fix bug where pathlib.PurePath.with_stem() converted a non-empty path suffix to a stem when given an empty stem argument. It now raises ValueError, just like pathlib.PurePath.with_suffix() does when called on a path with an empty stem, given a non-empty suffix argument.

• gh-107361 [https://github.com/python/cpython/issues/107361]: Add ssl.VERIFY_X509_PARTIAL_CHAIN and VERIFY_X509_STRICT to the default SSL context created with ssl.create_default_context().

• gh-112281 [https://github.com/python/cpython/issues/112281]: Allow creating union of types for typing.Annotated with unhashable metadata.

• gh-111775 [https://github.com/python/cpython/issues/111775]: Fix importlib.resources.simple.ResourceHandle.open() for text mode, added missed stream argument.

• gh-90095 [https://github.com/python/cpython/issues/90095]: Make .pdbrc and -c work with any valid pdb commands.

• gh-107625 [https://github.com/python/cpython/issues/107625]: Raise configparser.ParsingError from read() and read_file() methods of configparser.ConfigParser if a key without a corresponding value is continued (that is, followed by an indented line).

• gh-107155 [https://github.com/python/cpython/issues/107155]: Fix incorrect output of help(x) where x is a lambda function, which has an __annotations__ dictionary attribute with a "return" key.

• gh-57141 [https://github.com/python/cpython/issues/57141]: Add option for non-shallow comparisons to filecmp.dircmp like filecmp.cmp(). Original patch by Steven Ward. Enhanced by Tobias Rautenkranz

• gh-69990 [https://github.com/python/cpython/issues/69990]: Profile.print_stats() has been improved to accept multiple sort arguments. Patched by Chiu-Hsiang Hsu and Furkan Onder.

• gh-104061 [https://github.com/python/cpython/issues/104061]: Add socket.SO_BINDTOIFINDEX constant.

• gh-60346 [https://github.com/python/cpython/issues/60346]: Fix ArgumentParser inconsistent with parse_known_args.

• gh-102389 [https://github.com/python/cpython/issues/102389]: Add windows_31j to aliases for cp932 codec

• gh-72249 [https://github.com/python/cpython/issues/72249]: functools.partials of :func:repr() has been improved to include the module name. Patched by Furkan Onder and Anilyka Barry.

• gh-100985 [https://github.com/python/cpython/issues/100985]: Update HTTPSConnection to consistently wrap IPv6 Addresses when using a proxy.

• gh-100884 [https://github.com/python/cpython/issues/100884]: email: fix misfolding of comma in address-lists over multiple lines in combination with unicode encoding.

• gh-95782 [https://github.com/python/cpython/issues/95782]: Fix io.BufferedReader.tell(), io.BufferedReader.seek(), _pyio.BufferedReader.tell(), io.BufferedRandom.tell(), io.BufferedRandom.seek() and _pyio.BufferedRandom.tell() being able to return negative offsets.

• gh-96310 [https://github.com/python/cpython/issues/96310]: Fix a traceback in argparse when all options in a mutually exclusive group are suppressed.

• gh-93205 [https://github.com/python/cpython/issues/93205]: Fixed a bug in logging.handlers.TimedRotatingFileHandler where multiple rotating handler instances pointing to files with the same name but different extensions would conflict and not delete the correct files.

• bpo-31116 [https://bugs.python.org/issue?@action=redirect&bpo=31116]: Add Z85 encoding to base64.

• bpo-44865 [https://bugs.python.org/issue?@action=redirect&bpo=44865]: Add missing call to localization function in argparse.

• bpo-43952 [https://bugs.python.org/issue?@action=redirect&bpo=43952]: Fix multiprocessing.connection.Listener.accept() to accept empty bytes as authkey. Not accepting empty bytes as key causes it to hang indefinitely.

• bpo-42125 [https://bugs.python.org/issue?@action=redirect&bpo=42125]: linecache: get module name from __spec__ if available. This allows getting source code for the __main__ module when a custom loader is used.

• bpo-41122 [https://bugs.python.org/issue?@action=redirect&bpo=41122]: Failing to pass arguments properly to functools.singledispatchmethod() now throws a TypeError instead of hitting an index out of bounds internally.

• bpo-40818 [https://bugs.python.org/issue?@action=redirect&bpo=40818]: The asyncio REPL now runs sys.__interactivehook__ on startup. The default implementation of sys.__interactivehook__ provides autocompletion to the asyncio REPL. Patch contributed by Rémi Lapeyre.

• bpo-33775 [https://bugs.python.org/issue?@action=redirect&bpo=33775]: Add 'default' and 'version' help text for localization in argparse.

文档

• gh-115399 [https://github.com/python/cpython/issues/115399]: Document CVE 2023-52425 [https://www.cve.org/CVERecord?id=CVE-2023-52425] of Expat <2.6.0 under "XML vulnerabilities".

• gh-109653 [https://github.com/python/cpython/issues/109653]: Improve import time of uuid on Linux.

测试

• gh-71052 [https://github.com/python/cpython/issues/71052]: Add test exclusions to support running the test suite on Android.

• gh-71052 [https://github.com/python/cpython/issues/71052]: Enable test_concurrent_futures on platforms that support threading but not multiprocessing.

• gh-115796 [https://github.com/python/cpython/issues/115796]: Make 'testinternalcapi.assemblecode_object' construct the exception table for the code object.

• gh-115720 [https://github.com/python/cpython/issues/115720]: Leak tests (-R, --huntrleaks) now show a summary of the number of leaks found in each iteration.

• gh-115122 [https://github.com/python/cpython/issues/115122]: Add --bisect option to regrtest test runner: run failed tests with test.bisect_cmd to identify failing tests. Patch by Victor Stinner.

• gh-115596 [https://github.com/python/cpython/issues/115596]: Fix ProgramPriorityTests in test_os permanently changing the process priority.

• gh-115556 [https://github.com/python/cpython/issues/115556]: On Windows, commas passed in arguments to Tools\buildbot\test.bat and PCbuild\rt.bat are now properly handled.

• gh-115420 [https://github.com/python/cpython/issues/115420]: Fix translation of exception handler targets by testinternalcapi.optimizecfg.

• gh-115376 [https://github.com/python/cpython/issues/115376]: Fix segfault in testinternalcapi.compilercodegen on bad input.

构建

• gh-116313 [https://github.com/python/cpython/issues/116313]: Get WASI builds to work under wasmtime 18 w/ WASI 0.2/preview2 primitives.

• gh-71052 [https://github.com/python/cpython/issues/71052]: Change Android's sys.platform from "linux" to "android".

• gh-116117 [https://github.com/python/cpython/issues/116117]: Backport libb2's PR #42 to fix compiling CPython on 32-bit Windows with clang-cl.

• gh-71052 [https://github.com/python/cpython/issues/71052]: Fix several Android build issues

• gh-114099 [https://github.com/python/cpython/issues/114099]: A testbed project was added to run the test suite on iOS.

• gh-115350 [https://github.com/python/cpython/issues/115350]: Fix building ctypes module with -DWIN32_LEAN_AND_MEAN defined

• gh-111225 [https://github.com/python/cpython/issues/111225]: Link extension modules against libpython on Android.

• gh-115737 [https://github.com/python/cpython/issues/115737]: The install name for libPython is now correctly set for non-framework macOS builds.

• gh-114099 [https://github.com/python/cpython/issues/114099]: Makefile targets were added to support compiling an iOS-compatible framework build.

Windows

• gh-116012 [https://github.com/python/cpython/issues/116012]: Ensure the value of GetLastError() is preserved across GIL operations.

• gh-115582 [https://github.com/python/cpython/issues/115582]: Building extensions intended for free-threaded builds of CPython now require compiling with /DPy_GIL_DISABLED manually when using a regular install. This is expected to change in future releases.

• gh-115554 [https://github.com/python/cpython/issues/115554]: The installer now has more strict rules about updating the 适用于Windows的Python启动器. In general, most users only have a single launcher installed and will see no difference. When multiple launchers have been installed, the option to install the launcher is disabled until all but one have been removed. Downgrading the launcher (which was never allowed) is now more obviously blocked.

• gh-115543 [https://github.com/python/cpython/issues/115543]: 适用于Windows的Python启动器 can now detect Python 3.13 when installed from the Microsoft Store, and will install Python 3.12 by default when PYLAUNCHER_ALLOW_INSTALL is set.

macOS

• gh-116145 [https://github.com/python/cpython/issues/116145]: Update macOS installer to Tcl/Tk 8.6.14.

IDLE

• gh-88516 [https://github.com/python/cpython/issues/88516]: On macOS show a proxy icon in the title bar of editor windows to match platform behaviour.

工具/示例

• gh-100176 [https://github.com/python/cpython/issues/100176]: Remove outdated Tools/{io,cc,string}bench

• bpo-45101 [https://bugs.python.org/issue?@action=redirect&bpo=45101]: Add consistency in usage message IO between 2 versions of python-config.

C API

• gh-114626 [https://github.com/python/cpython/issues/114626]: Add again _PyCFunctionFastWithKeywords name, removed in Python 3.13 alpha 4 by mistake. Keep the old private _PyCFunctionFastWithKeywords name (Python 3.7) as an alias to the new public name PyCFunctionFastWithKeywords (Python 3.13a4). Patch by Victor Stinner.

• gh-111418 [https://github.com/python/cpython/issues/111418]: Add PyHASH_MODULUS, PyHASH_BITS, PyHASH_INF and PyHASH_IMAG C macros. Patch by Sergey B Kirpichev.

Python 3.13.0 alpha 4

Release date: 2024-02-15