安全性

• gh-115399 [https://github.com/python/cpython/issues/115399]: Update bundled libexpat to 2.6.0

• gh-115243 [https://github.com/python/cpython/issues/115243]: Fix possible crashes in collections.deque.index() when the deque is concurrently modified.

核心与内置函数

• gh-112087 [https://github.com/python/cpython/issues/112087]: For an empty reverse iterator for list will be reduced to reversed(). Patch by Donghee Na

• gh-114570 [https://github.com/python/cpython/issues/114570]: Add PythonFinalizationError exception. This exception derived from RuntimeError is raised when an operation is blocked during the Python finalization. Patch by Victor Stinner.

• gh-114695 [https://github.com/python/cpython/issues/114695]: Add sys._clear_internal_caches(), which clears all internal performance-related caches (and deprecate the less-general sys._clear_type_cache() function).

• gh-114828 [https://github.com/python/cpython/issues/114828]: Fix compilation crashes in uncommon code examples using super() inside a comprehension in a class body.

• gh-112069 [https://github.com/python/cpython/issues/112069]: Adapt set and frozenset methods to Argument Clinic.

• gh-115011 [https://github.com/python/cpython/issues/115011]: Setters for members with an unsigned integer type now support the same range of valid values for objects that has a __index__() method as for int.

• gh-114887 [https://github.com/python/cpython/issues/114887]: Changed socket type validation in create_datagram_endpoint() to accept all non-stream sockets. This fixes a regression in compatibility with raw sockets.

• gh-114944 [https://github.com/python/cpython/issues/114944]: Fixes a race between PyParkingLot_Park and PyParkingLotUnparkAll.

• gh-113462 [https://github.com/python/cpython/issues/113462]: Limit the number of versions that a single class can use. Prevents a few wayward classes using up all the version numbers.

• gh-76763 [https://github.com/python/cpython/issues/76763]: The chr() builtin function now always raises ValueError for values outside the valid range. Previously it raised OverflowError for very large or small values.

• gh-114806 [https://github.com/python/cpython/issues/114806]: No longer specialize calls to classes, if those classes have metaclasses. Fixes bug where the __call__ method of the metaclass was not being called.

• gh-107944 [https://github.com/python/cpython/issues/107944]: Improve error message for function calls with bad keyword arguments via getargs

• gh-112529 [https://github.com/python/cpython/issues/112529]: The free-threaded build no longer allocates space for the PyGC_Head structure in objects that support cyclic garbage collection. A number of other fields and data structures are used as replacements, including ob_gc_bits, ob_tid, and mimalloc internal data structures.

• gh-114456 [https://github.com/python/cpython/issues/114456]: Lower the recursion limit under a debug build of WASI.

• gh-114083 [https://github.com/python/cpython/issues/114083]: Compiler applies folding of LOAD_CONST with following instruction in a separate pass before other optimisations. This enables jump threading in certain circumstances.

• gh-114388 [https://github.com/python/cpython/issues/114388]: Fix a RuntimeWarning emitted when assign an integer-like value that is not an instance of int to an attribute that corresponds to a C struct member of type T_UINT and T_ULONG. Fix a double RuntimeWarning emitted when assign a negative integer value to an attribute that corresponds to a C struct member of type T_UINT.

• gh-114265 [https://github.com/python/cpython/issues/114265]: Compiler propagates line numbers before optimization, leading to more optimization opportunities and removing the need for the guarantee_lineno_for_exits hack.

• gh-112529 [https://github.com/python/cpython/issues/112529]: The free-threaded build now has its own threadsafe GC implementation that uses mimalloc to find GC tracked objects. It is non-generational, unlike the existing GC implementation.

• gh-114050 [https://github.com/python/cpython/issues/114050]: Fix segmentation fault caused by an incorrect format string in TypeError exception when more than two arguments are passed to int.

• gh-112354 [https://github.com/python/cpython/issues/112354]: The END_FOR instruction now pops only one value. This is to better support side exits in loops.

• gh-113884 [https://github.com/python/cpython/issues/113884]: Make queue.SimpleQueue thread safe when the GIL is disabled.

• gh-114058 [https://github.com/python/cpython/issues/114058]: Implement the foundations of the Tier 2 redundancy eliminator.

• gh-113939 [https://github.com/python/cpython/issues/113939]: frame.clear(): Clear frame.f_locals as well, and not only the fast locals. This is relevant once frame.f_locals was accessed, which would contain also references to all the locals.

• gh-112050 [https://github.com/python/cpython/issues/112050]: Convert collections.deque to use Argument Clinic.

• gh-112050 [https://github.com/python/cpython/issues/112050]: Make methods on collections.deque threadsafe when the GIL is disabled.

• gh-113464 [https://github.com/python/cpython/issues/113464]: Add an option (--enable-experimental-jit for configure-based builds or --experimental-jit for PCbuild-based ones) to build an experimental just-in-time compiler, based on copy-and-patch [https://fredrikbk.com/publications/copy-and-patch.pdf]

• gh-113055 [https://github.com/python/cpython/issues/113055]: Make interp->obmalloc a pointer. For interpreters that share state with the main interpreter, this points to the same static memory structure. For interpreters with their own obmalloc state, it is heap allocated. Add free_obmalloc_arenas() which will free the obmalloc arenas and radix tree structures for interpreters with their own obmalloc state.

• gh-55664 [https://github.com/python/cpython/issues/55664]: Add warning when creating type using a namespace dictionary with non-string keys. Patched by Daniel Urban and Furkan Onder.

• gh-104530 [https://github.com/python/cpython/issues/104530]: Use native Win32 condition variables.

库

• gh-115392 [https://github.com/python/cpython/issues/115392]: Fix a bug in doctest where incorrect line numbers would be reported for decorated functions.

• gh-114563 [https://github.com/python/cpython/issues/114563]: Fix several format() bugs when using the C implementation of Decimal: memory leak in some rare cases when using the z format option (coerce negative 0) incorrect output when applying the z format option to type F (fixed-point with capital NAN / INF) * incorrect output when applying the # format option (alternate form)

• gh-102840 [https://github.com/python/cpython/issues/102840]: Fix confused traceback when floordiv, mod, or divmod operations happens between instances of fractions.Fraction and complex.

• gh-115165 [https://github.com/python/cpython/issues/115165]: Most exceptions are now ignored when attempting to set the __orig_class__ attribute on objects returned when calling typing generic aliases (including generic aliases created using typing.Annotated). Previously only AttributeError was ignored. Patch by Dave Shawley.

• gh-112903 [https://github.com/python/cpython/issues/112903]: Fix "issubclass() arg 1 must be a class" errors in certain cases of multiple inheritance with generic aliases (regression in early 3.13 alpha releases).

• gh-115133 [https://github.com/python/cpython/issues/115133]: Fix tests for XMLPullParser with Expat 2.6.0.

• gh-115059 [https://github.com/python/cpython/issues/115059]: io.BufferedRandom.read1() now flushes the underlying write buffer.

• gh-79382 [https://github.com/python/cpython/issues/79382]: Trailing ** no longer allows to match files and nonexisting paths in recursive glob().

• gh-67837 [https://github.com/python/cpython/issues/67837]: Avoid race conditions in the creation of directories during concurrent extraction in tarfile and zipfile.

• gh-115060 [https://github.com/python/cpython/issues/115060]: Speed up pathlib.Path.glob() by removing redundant regex matching.

• gh-97928 [https://github.com/python/cpython/issues/97928]: Partially revert the behavior of tkinter.Text.count(). By default it preserves the behavior of older Python versions, except that setting wantobjects to 0 no longer has effect. Add a new parameter return_ints: specifying return_ints=True makes Text.count() always returning the single count as an integer instead of a 1-tuple or None.

• gh-114628 [https://github.com/python/cpython/issues/114628]: When csv.Error is raised when handling TypeError, do not print the TypeError traceback.

• gh-85984 [https://github.com/python/cpython/issues/85984]: Added POSIXVDISABLE from C's to termios.

• gh-114965 [https://github.com/python/cpython/issues/114965]: Update bundled pip to 24.0

• gh-114959 [https://github.com/python/cpython/issues/114959]: tarfile no longer ignores errors when trying to extract a directory on top of a file.

• gh-114894 [https://github.com/python/cpython/issues/114894]: Add array.array.clear().

• gh-114071 [https://github.com/python/cpython/issues/114071]: Support tuple subclasses using auto() for enum member value.

• gh-109475 [https://github.com/python/cpython/issues/109475]: Fix support of explicit option value "—" in argparse (e.g. --option=--).

• gh-49766 [https://github.com/python/cpython/issues/49766]: Fix date-datetime comparison. Now the special comparison methods like __eq__ and __lt__ return NotImplemented if one of comparands is date and other is datetime instead of ignoring the time part and the time zone or forcefully return "not equal" or raise TypeError. It makes comparison of date and datetime subclasses more symmetric and allows to change the default behavior by overriding the special comparison methods in subclasses.

• gh-110190 [https://github.com/python/cpython/issues/110190]: Fix ctypes structs with array on Windows ARM64 platform by setting MAX_STRUCT_SIZE to 32 in stgdict. Patch by Diego Russo

• gh-114678 [https://github.com/python/cpython/issues/114678]: Ensure that deprecation warning for 'N' specifier in Decimal format is not raised for cases where 'N' appears in other places in the format specifier. Based on patch by Stefan Krah.

• gh-70303 [https://github.com/python/cpython/issues/70303]: Return both files and directories from pathlib.Path.glob() if a pattern ends with "**". Previously only directories were returned.

• gh-109653 [https://github.com/python/cpython/issues/109653]: Improve import time of importlib.metadata and email.utils.

• gh-113280 [https://github.com/python/cpython/issues/113280]: Fix a leak of open socket in rare cases when error occurred in ssl.SSLSocket creation.

• gh-77749 [https://github.com/python/cpython/issues/77749]: email.policy.EmailPolicy.fold() now always encodes nonASCII characters in headers if utf8 is false.

• gh-83383 [https://github.com/python/cpython/issues/83383]: Synchronization of the dbm.dumb database is now no-op if there was no modification since opening or last synchronization. The directory file for a newly created empty dbm.dumb database is now created immediately after opening instead of deferring this until synchronizing or closing.

• gh-91602 [https://github.com/python/cpython/issues/91602]: Add filter keyword-only parameter to sqlite3.Connection.iterdump() for filtering database objects to dump. Patch by Mariusz Felisiak.

• gh-112451 [https://github.com/python/cpython/issues/112451]: Prohibit subclassing pure-Python datetime.timezone. This is consistent with C-extension implementation. Patch by Mariusz Felisiak.

• gh-69893 [https://github.com/python/cpython/issues/69893]: Add the close() method for the iterator returned by xml.etree.ElementTree.iterparse().

• gh-109653 [https://github.com/python/cpython/issues/109653]: Reduce the import time of threading module by ~50%. Patch by Daniel Hollas.

• gh-114492 [https://github.com/python/cpython/issues/114492]: Make the result of termios.tcgetattr() reproducible on Alpine Linux. Previously it could leave a random garbage in some fields.

• gh-114315 [https://github.com/python/cpython/issues/114315]: Make threading.Lock a real class, not a factory function. Add _new_ to _thread.lock type.

• gh-100414 [https://github.com/python/cpython/issues/100414]: Add dbm.sqlite3 as a backend to dbm, and make it the new default dbm backend. Patch by Raymond Hettinger and Erlend E. Aasland.

• gh-113267 [https://github.com/python/cpython/issues/113267]: Revert changes in gh-106584 [https://github.com/python/cpython/issues/106584] which made calls of TestResult methods startTest() and stopTest() unbalanced.

• gh-75128 [https://github.com/python/cpython/issues/75128]: Ignore an OSError in asyncio.BaseEventLoop.create_server() when IPv6 is available but the interface cannot actually support it.

• gh-114423 [https://github.com/python/cpython/issues/114423]: _DummyThread entries in threading._active are now automatically removed when the related thread dies.

• gh-114257 [https://github.com/python/cpython/issues/114257]: Dismiss the FileNotFound error in ctypes.util.find_library() and just return None on Linux.

• gh-114321 [https://github.com/python/cpython/issues/114321]: Expose more platform specific constants in the fcntl module on Linux, macOS, FreeBSD and NetBSD.

• gh-114328 [https://github.com/python/cpython/issues/114328]: The tty.setcbreak() and new tty.cfmakecbreak() no longer clears the terminal input ICRLF flag. This fixes a regression introduced in 3.12 that no longer matched how OSes define cbreak mode in their stty(1) manual pages.

• gh-114281 [https://github.com/python/cpython/issues/114281]: Remove type hints from Lib/asyncio/staggered.py. The annotations in the typeshed [https://github.com/python/typeshed] project should be used instead.

• gh-101438 [https://github.com/python/cpython/issues/101438]: Avoid reference cycle in ElementTree.iterparse. The iterator returned by ElementTree.iterparse may hold on to a file descriptor. The reference cycle prevented prompt cleanup of the file descriptor if the returned iterator was not exhausted.

• gh-114198 [https://github.com/python/cpython/issues/114198]: The signature for the __replace__ method on dataclasses now has the first argument named self, rather than obj.

• gh-104522 [https://github.com/python/cpython/issues/104522]: OSError raised when run a subprocess now only has filename attribute set to cwd if the error was caused by a failed attempt to change the current directory.

• gh-114149 [https://github.com/python/cpython/issues/114149]: Enum: correctly handle tuple subclasses in custom _new_.

• gh-83648 [https://github.com/python/cpython/issues/83648]: Support deprecation of options, positional arguments and subcommands in argparse.

• gh-114087 [https://github.com/python/cpython/issues/114087]: Speed up dataclasses.asdict up to 1.35x.

• gh-109534 [https://github.com/python/cpython/issues/109534]: Fix a reference leak in asyncio.selector_events.BaseSelectorEventLoop when SSL handshakes fail. Patch contributed by Jamie Phan.

• gh-79634 [https://github.com/python/cpython/issues/79634]: Accept pathlike objects as patterns in pathlib.Path.glob() and rglob().

• gh-112202 [https://github.com/python/cpython/issues/112202]: Ensure that a asyncio.Condition.notify() call does not get lost if the awakened Task is simultaneously cancelled or encounters any other error.

• gh-113951 [https://github.com/python/cpython/issues/113951]: Fix the behavior of tag_unbind() methods of tkinter.Text and tkinter.Canvas classes with three arguments. Previously, widget.tag_unbind(tag, sequence, funcid) destroyed the current binding for sequence, leaving sequence unbound, and deleted the funcid command. Now it removes only funcid from the binding for sequence, keeping other commands, and deletes the funcid command. It leaves sequence unbound only if funcid was the last bound command.

• gh-97959 [https://github.com/python/cpython/issues/97959]: Fix rendering class methods, bound methods, method and function aliases in pydoc. Class methods no longer have "method of builtins.type instance" note. Corresponding notes are now added for class and unbound methods. Method and function aliases now have references to the module or the class where the origin was defined if it differs from the current. Bound methods are now listed in the static methods section. Methods of builtin classes are now supported as well as methods of Python classes.

• gh-113796 [https://github.com/python/cpython/issues/113796]: Add more validation checks in the csv.Dialect constructor. ValueError is now raised if the same character is used in different roles.

• gh-113732 [https://github.com/python/cpython/issues/113732]: Fix support of QUOTE_NOTNULL and QUOTE_STRINGS in csv.reader().

• gh-113225 [https://github.com/python/cpython/issues/113225]: Speed up pathlib.Path.walk() by using os.DirEntry.path where possible.

• gh-89039 [https://github.com/python/cpython/issues/89039]: When replace() method is called on a subclass of datetime, date or time, properly call derived constructor. Previously, only the base class's constructor was called.

Also, make sure to pass non-zero fold values when creating subclasses in various methods. Previously, fold was silently ignored.

• gh-112919 [https://github.com/python/cpython/issues/112919]: Speedup datetime.datetime.replace(), datetime.date.replace() and datetime.time.replace().

• gh-59013 [https://github.com/python/cpython/issues/59013]: Set breakpoint on the first executable line of the function, instead of the line of function definition when the user do break func using pdb

• gh-112343 [https://github.com/python/cpython/issues/112343]: Improve handling of pdb convenience variables to avoid replacing string contents.

• gh-112240 [https://github.com/python/cpython/issues/112240]: Add option to calendar module CLI to specify the weekday to start each week. Patch by Steven Ward.

• gh-111741 [https://github.com/python/cpython/issues/111741]: Recognise image/webp as a standard format in the mimetypes module.

• gh-43457 [https://github.com/python/cpython/issues/43457]: Fix the tkinter widget method wm_attributes(). It now accepts the attribute name without the minus prefix to get window attributes and allows to specify attributes and values to set as keyword arguments. Add new optional keyword argument return_python_dict: calling w.wm_attributes(return_python_dict=True) returns the attributes as a dict instead of a tuple. Calling w.wm_attributes() now returns a tuple instead of string if wantobjects was set to 0.

• gh-82626 [https://github.com/python/cpython/issues/82626]: Many functions now emit a warning if a boolean value is passed as a file descriptor argument.

• gh-111051 [https://github.com/python/cpython/issues/111051]: Added check for file modification during debugging with pdb

• gh-110345 [https://github.com/python/cpython/issues/110345]: Show the Tcl/Tk patchlevel (rather than version) in tkinter._test().

• gh-38807 [https://github.com/python/cpython/issues/38807]: Fix race condition in trace. Instead of checking if a directory exists and creating it, directly call os.makedirs() with the kwarg exist_ok=True.

• gh-75705 [https://github.com/python/cpython/issues/75705]: Set unixfrom envelope in mailbox.mbox and mailbox.MMDF.

• gh-106233 [https://github.com/python/cpython/issues/106233]: Fix stacklevel in InvalidTZPathWarning during zoneinfo module import.

• gh-105102 [https://github.com/python/cpython/issues/105102]: Allow ctypes.Union to be nested in ctypes.Structure when the system endianness is the opposite of the classes.

• gh-104282 [https://github.com/python/cpython/issues/104282]: Fix null pointer dereference in lzma._decode_filter_properties() due to improper handling of BCJ filters with properties of zero length. Patch by Radislav Chugunov.

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

• gh-101599 [https://github.com/python/cpython/issues/101599]: Changed argparse flag options formatting to remove redundancy.

• gh-85984 [https://github.com/python/cpython/issues/85984]: Add POSIX pseudo-terminal functions os.posix_openpt(), os.grantpt(), os.unlockpt(), and os.ptsname().

• gh-102512 [https://github.com/python/cpython/issues/102512]: When os.fork() is called from a foreign thread (aka _DummyThread), the type of the thread in a child process is changed to _MainThread. Also changed its name and daemonic status, it can be now joined.

• gh-88569 [https://github.com/python/cpython/issues/88569]: Add os.path.isreserved(), which identifies reserved pathnames such as "NUL", "AUX" and "CON". This function is only available on Windows.

Deprecate pathlib.PurePath.is_reserved().

• bpo-38364 [https://bugs.python.org/issue?@action=redirect&bpo=38364]: The inspect functions isgeneratorfunction, iscoroutinefunction, isasyncgenfunction now support functools.partialmethod wrapped functions the same way they support functools.partial.

文档

• gh-115233 [https://github.com/python/cpython/issues/115233]: Fix an example for LoggerAdapter in the Logging Cookbook.

• gh-114123 [https://github.com/python/cpython/issues/114123]: Move the csv module docstring to the csv module instead of reexporting it from the internal _csv module, and remove __doc__ from csv.__all__.

Move csv.__version__ to the csv module instead of reexporting it from the internal _csv module, and remove __version__ from csv.__all__.

测试

• gh-114099 [https://github.com/python/cpython/issues/114099]: Added test exclusions required to run the test suite on iOS.

• gh-105089 [https://github.com/python/cpython/issues/105089]: Fix test.test_zipfile.test_core.TestWithDirectory.test_create_directory_with_write test in AIX by doing a bitwise AND of 0xFFFF on mode , so that it will be in sync with zinfo.external_attr

构建

• gh-115167 [https://github.com/python/cpython/issues/115167]: Avoid vendoring vcruntime140_threads.dll when building with Visual Studio 2022 version 17.8.

• gh-113632 [https://github.com/python/cpython/issues/113632]: Promote WASI to a tier 2 platform and drop Emscripten from tier 3 in configure.ac.

• gh-114099 [https://github.com/python/cpython/issues/114099]: configure and Makefile were refactored to accommodate framework builds on Apple platforms other than macOS.

• gh-114875 [https://github.com/python/cpython/issues/114875]: Add getgrent() as a prerequisite for building the grp module.

Windows

• gh-115049 [https://github.com/python/cpython/issues/115049]: Fixes py.exe launcher failing when run as users without user profiles.

• gh-115009 [https://github.com/python/cpython/issues/115009]: Update Windows installer to use SQLite 3.45.1.

• gh-109991 [https://github.com/python/cpython/issues/109991]: Update Windows build to use OpenSSL 3.0.13.

• gh-111239 [https://github.com/python/cpython/issues/111239]: Update Windows builds to use zlib v1.3.1.

• gh-100107 [https://github.com/python/cpython/issues/100107]: The py.exe launcher will no longer attempt to run the Microsoft Store redirector when launching a script containing a usrbin/env shebang

• gh-112984 [https://github.com/python/cpython/issues/112984]: Adds free-threaded binaries to Windows installer as an optional component.

• gh-89240 [https://github.com/python/cpython/issues/89240]: Allows multiprocessing to create pools of greater than 62 processes.

macOS

• gh-115009 [https://github.com/python/cpython/issues/115009]: Update macOS installer to use SQLite 3.45.1.

• gh-109991 [https://github.com/python/cpython/issues/109991]: Update macOS installer to use OpenSSL 3.0.13.

• gh-114490 [https://github.com/python/cpython/issues/114490]: Add Mach-O linkage support for platform.architecture().

• gh-87804 [https://github.com/python/cpython/issues/87804]: On macOS the result of os.statvfs and os.fstatvfs now correctly report the size of very large disks, in previous versions the reported number of blocks was wrong for disks with at least 2**32 blocks.

IDLE

• gh-96905 [https://github.com/python/cpython/issues/96905]: In idlelib code, stop redefining builtins 'dict' and 'object'.

• gh-103820 [https://github.com/python/cpython/issues/103820]: Revise IDLE bindings so that events from mouse button 4/5 on non-X11 windowing systems (i.e. Win32 and Aqua) are not mistaken for scrolling.

工具/示例

• gh-113516 [https://github.com/python/cpython/issues/113516]: Don't set LDSHARED when building for WASI.

• gh-109991 [https://github.com/python/cpython/issues/109991]: Update GitHub CI workflows to use OpenSSL 3.0.13 and multissltests to use 1.1.1w, 3.0.13, 3.1.5, and 3.2.1.

• gh-115015 [https://github.com/python/cpython/issues/115015]: Fix a bug in Argument Clinic that generated incorrect code for methods with no parameters that use the METH_METHOD | METH_FASTCALL | METH_KEYWORDS calling convention. Only the positional parameter count was checked; any keyword argument passed would be silently accepted.

C API

• gh-111140 [https://github.com/python/cpython/issues/111140]: Adds PyLong_AsNativeBytes(), PyLong_FromNativeBytes() and PyLong_FromUnsignedNativeBytes() functions.

• gh-114685 [https://github.com/python/cpython/issues/114685]: PyBuffer_FillInfo() now raises a SystemError if called with PyBUF_READ or PyBUF_WRITE as flags. These flags should only be used with the PyMemoryView_* C API.

• gh-114685 [https://github.com/python/cpython/issues/114685]: PyObject_GetBuffer() now raises a SystemError if called with PyBUF_READ or PyBUF_WRITE as flags. These flags should only be used with the PyMemoryView_* C API.

• gh-114626 [https://github.com/python/cpython/issues/114626]: Add PyCFunctionFast and PyCFunctionFastWithKeywords typedefs (identical to the existing _PyCFunctionFast and _PyCFunctionFastWithKeywords typedefs, just without a leading _ prefix).

• gh-114329 [https://github.com/python/cpython/issues/114329]: Add PyList_GetItemRef(), which is similar to PyList_GetItem() but returns a strong reference instead of a borrowed reference.

• gh-110850 [https://github.com/python/cpython/issues/110850]: Add PyTime C API:

  • PyTime_t 类型。

  • PyTime_MIN 和 PyTime_MAX 常量。

  • PyTime_AsSecondsDouble(), PyTime_Monotonic(), PyTime_PerfCounter(), and PyTime_Time() functions.

Patch by Victor Stinner.

• gh-112066 [https://github.com/python/cpython/issues/112066]: Add PyDict_SetDefaultRef(): insert a key and value into a dictionary if the key is not already present. This is similar to dict.setdefault(), but returns an integer value indicating if the key was already present. It is also similar to PyDict_SetDefault(), but returns a strong reference instead of a borrowed reference.

Python 3.13.0 alpha 3

Release date: 2024-01-17

安全性

• gh-113659 [https://github.com/python/cpython/issues/113659]: Skip .pth files with names starting with a dot or hidden file attribute.

• gh-112302 [https://github.com/python/cpython/issues/112302]: Created a Software Bill-of-Materials document and tooling for tracking dependencies.

核心与内置函数

• gh-107901 [https://github.com/python/cpython/issues/107901]: Compiler duplicates basic blocks that have an eval breaker check, no line number, and multiple predecessors.

• gh-107901 [https://github.com/python/cpython/issues/107901]: A jump leaving an exception handler back to normal code no longer checks the eval breaker.

• gh-113655 [https://github.com/python/cpython/issues/113655]: Set the C recursion limit to 4000 on Windows, and 10000 on Linux/OSX. This seems to be near the sweet spot to maintain safety, but not compromise backwards compatibility.

• gh-113710 [https://github.com/python/cpython/issues/113710]: Add typed stack effects to the interpreter DSL, along with various instruction annotations.

• gh-77046 [https://github.com/python/cpython/issues/77046]: On Windows, file descriptors wrapping Windows handles are now created non inheritable by default ( PEP 446 [https://peps.python.org/pep-0446/]). Patch by Zackery Spytz and Victor Stinner.

• gh-113853 [https://github.com/python/cpython/issues/113853]: Guarantee that all executors make progress. This then guarantees that tier 2 execution always makes progress.

• gh-113753 [https://github.com/python/cpython/issues/113753]: Fix an issue where the finalizer of PyAsyncGenASend objects might not be called if they were allocated from a free list.

• gh-107901 [https://github.com/python/cpython/issues/107901]: Compiler changed so that synthetic jumps which are not at loop end no longer check the eval breaker.

• gh-113703 [https://github.com/python/cpython/issues/113703]: Fix a regression in the codeop module that was causing it to incorrectly identify incomplete fstrings. Patch by Pablo Galindo

• gh-89811 [https://github.com/python/cpython/issues/89811]: Check for a valid tp_version_tag before performing bytecode specializations that rely on this value being usable.

• gh-111488 [https://github.com/python/cpython/issues/111488]: Changed error message in case of no 'in' keyword after 'for' in list comprehensions

• gh-113657 [https://github.com/python/cpython/issues/113657]: Fix an issue that caused important instruction pointer updates to be optimized out of tier two traces.

• gh-113603 [https://github.com/python/cpython/issues/113603]: Fixed bug where a redundant NOP is not removed, causing an assertion to fail in the compiler in debug mode.

• gh-113602 [https://github.com/python/cpython/issues/113602]: Fix an error that was causing the parser to try to overwrite existing errors and crashing in the process. Patch by Pablo Galindo

• gh-113486 [https://github.com/python/cpython/issues/113486]: No longer issue spurious PY_UNWIND events for optimized calls to classes.

• gh-113297 [https://github.com/python/cpython/issues/113297]: Fix segfault in the compiler on with statement with 19 context managers.

• gh-113212 [https://github.com/python/cpython/issues/113212]: Improve super error messages.

• gh-111375 [https://github.com/python/cpython/issues/111375]: Only use NULL in the exception stack to indicate an exception was handled. Patch by Carey Metcalfe.

• gh-112215 [https://github.com/python/cpython/issues/112215]: Increase the C recursion limit by a factor of 3 for non-debug builds, except for webassembly and s390 platforms which are unchanged. This mitigates some regressions in 3.12 with deep recursion mixing builtin (C) and Python code.

• gh-113054 [https://github.com/python/cpython/issues/113054]: Fixed bug where a redundant NOP is not removed, causing an assertion to fail in the compiler in debug mode.

• gh-106905 [https://github.com/python/cpython/issues/106905]: Use per AST-parser state rather than global state to track recursion depth within the AST parser to prevent potential race condition due to simultaneous parsing.

The issue primarily showed up in 3.11 by multithreaded users of ast.parse(). In 3.12 a change to when garbage collection can be triggered prevented the race condition from occurring.

• gh-108866 [https://github.com/python/cpython/issues/108866]: Change the API and contract of _PyExecutorObject to return the next_instr pointer, instead of the frame, and to always execute at least one instruction.

• gh-90350 [https://github.com/python/cpython/issues/90350]: Optimize builtin functions min() and max().

• gh-112943 [https://github.com/python/cpython/issues/112943]: Correctly compute end column offsets for multiline tokens in the tokenize module. Patch by Pablo Galindo

• gh-112125 [https://github.com/python/cpython/issues/112125]: Fix None._ne_(None) returning NotImplemented instead of False.

• gh-74616 [https://github.com/python/cpython/issues/74616]: input() now raises a ValueError when output on the terminal if the prompt contains embedded null characters instead of silently truncating it.

• gh-112716 [https://github.com/python/cpython/issues/112716]: Fix SystemError in the import statement and in __reduce__() methods of builtin types when __builtins__ is not a dict.

• gh-112730 [https://github.com/python/cpython/issues/112730]: Use color to highlight error locations in tracebacks. Patch by Pablo Galindo

• gh-112625 [https://github.com/python/cpython/issues/112625]: Fixes a bug where a bytearray object could be cleared while iterating over an argument in the bytearray.join() method that could result in reading memory after it was freed.

• gh-112660 [https://github.com/python/cpython/issues/112660]: Do not clear unexpected errors during formatting error messages for ImportError and AttributeError for modules.

• gh-105967 [https://github.com/python/cpython/issues/105967]: Workaround a bug in Apple's macOS platform zlib library where zlib.crc32() and binascii.crc32() could produce incorrect results on multi-gigabyte inputs. Including when using zipfile on zips containing large data.

• gh-95754 [https://github.com/python/cpython/issues/95754]: Provide a better error message when accessing invalid attributes on partially initialized modules. The origin of the module being accessed is now included in the message to help with the common issue of shadowing other modules.

• gh-112217 [https://github.com/python/cpython/issues/112217]: Add check for the type of __cause__ returned from calling the type T in raise from T.

• gh-111058 [https://github.com/python/cpython/issues/111058]: Change coro.cr_frame/gen.gi_frame to return None after the coroutine/generator has been closed. This fixes a bug where getcoroutinestate() and getgeneratorstate() return the wrong state for a closed coroutine/generator.

• gh-112388 [https://github.com/python/cpython/issues/112388]: Fix an error that was causing the parser to try to overwrite tokenizer errors. Patch by pablo Galindo

• gh-112387 [https://github.com/python/cpython/issues/112387]: Fix error positions for decoded strings with backwards tokenize errors. Patch by Pablo Galindo

• gh-99606 [https://github.com/python/cpython/issues/99606]: Make code generated for an empty fstring identical to the code of an empty normal string.

• gh-112367 [https://github.com/python/cpython/issues/112367]: Avoid undefined behaviour when using the perf trampolines by not freeing the code arenas until shutdown. Patch by Pablo Galindo

• gh-112320 [https://github.com/python/cpython/issues/112320]: The Tier 2 translator now tracks the confidence level for staying "on trace" (i.e. not exiting back to the Tier 1 interpreter) for branch instructions based on the number of bits set in the branch "counter". Trace translation ends when the confidence drops below 1/3rd.

• gh-109598 [https://github.com/python/cpython/issues/109598]: PyComplex_RealAsDouble()/PyComplex_ImagAsDouble() now tries to convert an object to a complex instance using its __complex__() method before falling back to the __float__() method. Patch by Sergey B Kirpichev.

• gh-94606 [https://github.com/python/cpython/issues/94606]: Fix UnicodeEncodeError when email.message.get_payload() reads a message with a Unicode surrogate character and the message content is not well-formed for surrogateescape encoding. Patch by Sidney Markowitz.

• bpo-21861 [https://bugs.python.org/issue?@action=redirect&bpo=21861]: Use the object's actual class name in io.FileIO.repr_(), io.WindowsConsoleIO() and io.TextIOWrapper.repr_(), to make these methods subclass friendly.

• bpo-45369 [https://bugs.python.org/issue?@action=redirect&bpo=45369]: Remove LibreSSL workarounds as per PEP 644 [https://peps.python.org/pep-0644/].

• bpo-34392 [https://bugs.python.org/issue?@action=redirect&bpo=34392]: Added sys._is_interned().

库

• gh-114077 [https://github.com/python/cpython/issues/114077]: Fix possible OverflowError in socket.socket.sendfile() when pass count larger than 2 GiB on 32-bit platform.

• gh-111803 [https://github.com/python/cpython/issues/111803]: plistlib now supports loading more deeply nested lists in binary format.

• gh-114014 [https://github.com/python/cpython/issues/114014]: Fixed a bug in fractions.Fraction where an invalid string using d in the decimals part creates a different error compared to other invalid letters/characters. Patch by Jeremiah Gabriel Pascual.

• gh-108364 [https://github.com/python/cpython/issues/108364]: sqlite3.Connection.iterdump() now ensures that foreign key support is disabled before dumping the database schema, if there is any foreign key violation. Patch by Erlend E. Aasland and Mariusz Felisiak.

• gh-113971 [https://github.com/python/cpython/issues/113971]: The zipfile.ZipInfo previously protected ._compresslevel attribute has been made public as .compress_level with the old _compresslevel name remaining available as a property to retain compatibility.

• gh-113877 [https://github.com/python/cpython/issues/113877]: Fix tkinter method winfo_pathname() on 64-bit Windows.

• gh-113868 [https://github.com/python/cpython/issues/113868]: Added mmap.MAP_NORESERVE, mmap.MAP_NOEXTEND, mmap.MAP_HASSEMAPHORE, mmap.MAP_NOCACHE, mmap.MAP_JIT, mmap.MAP_RESILIENT_CODESIGN, mmap.MAP_RESILIENT_MEDIA, mmap.MAP_32BIT, mmap.MAP_TRANSLATED_ALLOW_EXECUTE, mmap.MAP_UNIX03 and mmap.MAP_TPRO. All of them are mmap(2) flags on macOS.

• gh-113848 [https://github.com/python/cpython/issues/113848]: asyncio.TaskGroup() and asyncio.timeout() context managers now handle CancelledError subclasses as well as exact CancelledError.

• gh-113661 [https://github.com/python/cpython/issues/113661]: unittest runner: Don't exit 5 if tests were skipped. The intention of exiting 5 was to detect issues where the test suite wasn't discovered at all. If we skipped tests, it was correctly discovered.

• gh-96037 [https://github.com/python/cpython/issues/96037]: Insert TimeoutError in the context of the exception that was raised during exiting an expired asyncio.timeout() block.

• gh-113781 [https://github.com/python/cpython/issues/113781]: Silence unraisable AttributeError when warnings are emitted during Python finalization.

• gh-113238 [https://github.com/python/cpython/issues/113238]: Add Anchor to importlib.resources (in order for the code to comply with the documentation)

• gh-111693 [https://github.com/python/cpython/issues/111693]: asyncio.Condition.wait() now reraises the same CancelledError instance that may have caused it to be interrupted. Fixed race condition in asyncio.Semaphore.acquire() when interrupted with a CancelledError.

• gh-113791 [https://github.com/python/cpython/issues/113791]: Add CLOCK_MONOTONIC_RAW_APPROX and CLOCK_UPTIME_RAW_APPROX to time on macOS. These are clocks available on macOS 10.12 or later.

• gh-112932 [https://github.com/python/cpython/issues/112932]: Restore the ability for zipfile to extractall from zip files with a "/" directory entry in them as is commonly added to zips by some wiki or bug tracker data exporters.

• gh-113568 [https://github.com/python/cpython/issues/113568]: Raise deprecation warnings from pathlib.PurePath and not its private base class PurePathBase.

• gh-113594 [https://github.com/python/cpython/issues/113594]: Fix UnicodeEncodeError in email when re-fold lines that contain unknown-8bit encoded part followed by non-unknown-8bit encoded part.

• gh-113538 [https://github.com/python/cpython/issues/113538]: In asyncio.StreamReaderProtocol.connection_made(), there is callback that logs an error if the task wrapping the "connected callback" fails. This callback would itself fail if the task was cancelled. Prevent this by checking whether the task was cancelled first. If so, close the transport but don't log an error.

• gh-113626 [https://github.com/python/cpython/issues/113626]: Add support for the allow_code argument in the marshal module. Passing allow_code=False prevents serialization and deserialization of code objects which is incompatible between Python versions.

• gh-85567 [https://github.com/python/cpython/issues/85567]: Fix resource warnings for unclosed files in pickle and pickletools command line interfaces.

• gh-113537 [https://github.com/python/cpython/issues/113537]: Support loads str in plistlib.loads().

• gh-89850 [https://github.com/python/cpython/issues/89850]: Add default implementations of pickle.Pickler.persistent_id() and pickle.Unpickler.persistent_load() methods in the C implementation. Calling super().persistent_id() and super().persistent_load() in subclasses of the C implementation of pickle.Pickler and pickle.Unpickler classes no longer causes infinite recursion.

• gh-113569 [https://github.com/python/cpython/issues/113569]: Indicate if there were no actual calls in unittest asserthascalls() failure.

• gh-101225 [https://github.com/python/cpython/issues/101225]: Increase the backlog for multiprocessing.connection.Listener objects created by multiprocessing.manager and multiprocessing.resource_sharer to significantly reduce the risk of getting a connection refused error when creating a multiprocessing.connection.Connection to them.

• gh-113568 [https://github.com/python/cpython/issues/113568]: Raise audit events from pathlib.Path and not its private base class PathBase.

• gh-113543 [https://github.com/python/cpython/issues/113543]: Make sure that webbrowser.MacOSXOSAScript sends webbrowser.open audit event.

• gh-113028 [https://github.com/python/cpython/issues/113028]: When a second reference to a string appears in the input to pickle, and the Python implementation is in use, we are guaranteed that a single copy gets pickled and a single object is shared when reloaded. Previously, in protocol 0, when a string contained certain characters (e.g. newline) it resulted in duplicate objects.

• gh-113421 [https://github.com/python/cpython/issues/113421]: Fix multiprocessing logger for %(filename)s.

• gh-111784 [https://github.com/python/cpython/issues/111784]: Fix segfaults in the _elementtree module. Fix first segfault during deallocation of _elementtree.XMLParser instances by keeping strong reference to pyexpat module in module state for capsule lifetime. Fix second segfault which happens in the same deallocation process by keeping strong reference to _elementtree module in XMLParser structure for _elementtree module lifetime.

• gh-113407 [https://github.com/python/cpython/issues/113407]: Fix import of unittest.mock when CPython is built without docstrings.

• gh-113320 [https://github.com/python/cpython/issues/113320]: Fix regression in Python 3.12 where Protocol classes that were not marked as runtime-checkable would be unnecessarily introspected, potentially causing exceptions to be raised if the protocol had problematic members. Patch by Alex Waygood.

• gh-53502 [https://github.com/python/cpython/issues/53502]: Add a new option aware_datetime in plistlib to loads or dumps aware datetime.

• gh-113358 [https://github.com/python/cpython/issues/113358]: Fix rendering tracebacks with exceptions with a broken getattr

• gh-113214 [https://github.com/python/cpython/issues/113214]: Fix an AttributeError during asyncio SSL protocol aborts in SSL-over-SSL scenarios.

• gh-113246 [https://github.com/python/cpython/issues/113246]: Update bundled pip to 23.3.2.

• gh-87264 [https://github.com/python/cpython/issues/87264]: Fixed tarfile list() method to show file type.

• gh-112182 [https://github.com/python/cpython/issues/112182]: asyncio.futures.Future.set_exception() now transforms StopIteration into RuntimeError instead of hanging or other misbehavior. Patch contributed by Jamie Phan.

• gh-113225 [https://github.com/python/cpython/issues/113225]: Speed up pathlib.Path.glob() by using os.DirEntry.path where possible.

• gh-113149 [https://github.com/python/cpython/issues/113149]: Improve error message when a JSON array or object contains a trailing comma. Patch by Carson Radtke.

• gh-113117 [https://github.com/python/cpython/issues/113117]: The subprocess module can now use the os.posix_spawn() function with close_fds=True on platforms where posix_spawn_file_actions_addclosefrom_np is available. Patch by Jakub Kulik.

• gh-113199 [https://github.com/python/cpython/issues/113199]: Make http.client.HTTPResponse.read1 and http.client.HTTPResponse.readline close IO after reading all data when content length is known. Patch by Illia Volochii.

• gh-113191 [https://github.com/python/cpython/issues/113191]: Add support of os.fchmod() and a file descriptor in os.chmod() on Windows.

• gh-113188 [https://github.com/python/cpython/issues/113188]: Fix shutil.copymode() and shutil.copystat() on Windows. Previously they worked differently if dst is a symbolic link: they modified the permission bits of dst itself rather than the file it points to if follow_symlinks is true or src is not a symbolic link, and did not modify the permission bits if follow_symlinks is false and src is a symbolic link.

• gh-113119 [https://github.com/python/cpython/issues/113119]: os.posix_spawn() now accepts env=None, which makes the newly spawned process use the current process environment. Patch by Jakub Kulik.

• gh-113202 [https://github.com/python/cpython/issues/113202]: Add a strict option to batched() in the itertools module.

• gh-61648 [https://github.com/python/cpython/issues/61648]: Detect line numbers of properties in doctests.

• gh-113175 [https://github.com/python/cpython/issues/113175]: Sync with importlibmetadata 7.0, including improved type annotations, fixed issue with symlinked packages in package_distributions, added EntryPoints._repr\, introduced the diagnose script, added Distribution.origin property, and removed deprecated EntryPoint access by numeric index (tuple behavior).

• gh-59616 [https://github.com/python/cpython/issues/59616]: Add support of os.lchmod() and the follow_symlinks argument in os.chmod() on Windows. Note that the default value of follow_symlinks in os.lchmod() is False on Windows.

• gh-112559 [https://github.com/python/cpython/issues/112559]: signal.signal() and signal.getsignal() no longer call repr on callable handlers. asyncio.run() and asyncio.Runner.run() no longer call repr on the task results. Patch by Yilei Yang.

• gh-112962 [https://github.com/python/cpython/issues/112962]: dis module functions add cache information to the Instruction instance rather than creating fake Instruction instances to represent the cache entries.

• gh-112989 [https://github.com/python/cpython/issues/112989]: Reduce overhead to connect sockets with asyncio SelectorEventLoop.

• gh-112970 [https://github.com/python/cpython/issues/112970]: Use closefrom() on Linux where available (e.g. glibc-2.34), rather than only FreeBSD.

• gh-110190 [https://github.com/python/cpython/issues/110190]: Fix ctypes structs with array on PPC64LE platform by setting MAX_STRUCT_SIZE to 64 in stgdict. Patch by Diego Russo.

• gh-112540 [https://github.com/python/cpython/issues/112540]: The statistics.geometric_mean() function now returns zero for datasets containing a zero. Formerly, it would raise an exception.

• gh-87286 [https://github.com/python/cpython/issues/87286]: Added LOG_FTP, LOG_NETINFO, LOG_REMOTEAUTH, LOG_INSTALL, LOG_RAS, and LOG_LAUNCHD tot the syslog module, all of them constants on used on macOS.

• gh-112800 [https://github.com/python/cpython/issues/112800]: Fix asyncio SubprocessTransport.close() not to throw PermissionError when used with setuid executables.

• gh-51944 [https://github.com/python/cpython/issues/51944]: Add the following constants to the termios module. These values are present in macOS system headers: ALTWERASE, B14400, B28800, B7200, B76800, CCAR_OFLOW, CCTS_OFLOW, CDSR_OFLOW, CDTR_IFLOW, CIGNORE, CRTS_IFLOW, EXTPROC, IUTF8, MDMBUF, NL2, NL3, NOKERNINFO, ONOEOT, OXTABS, VDSUSP, VSTATUS.

• gh-79325 [https://github.com/python/cpython/issues/79325]: Fix an infinite recursion error in tempfile.TemporaryDirectory() cleanup on Windows.

• gh-94692 [https://github.com/python/cpython/issues/94692]: shutil.rmtree() now only catches OSError exceptions. Previously a symlink attack resistant version of shutil.rmtree() could ignore or pass to the error handler arbitrary exception when invalid arguments were provided.

• gh-112736 [https://github.com/python/cpython/issues/112736]: The use of del-safe symbols in subprocess was refactored to allow for use in cross-platform build environments.

• gh-112727 [https://github.com/python/cpython/issues/112727]: Speed up pathlib.Path.absolute(). Patch by Barney Gale.

• gh-74690 [https://github.com/python/cpython/issues/74690]: Speedup issubclass() checks against simple runtime-checkable protocols by around 6%. Patch by Alex Waygood.

• gh-74690 [https://github.com/python/cpython/issues/74690]: Speedup isinstance() checks by roughly 20% for runtime-checkable protocols that only have one callable member. Speedup issubclass() checks for these protocols by roughly 10%. Patch by Alex Waygood.

• gh-112645 [https://github.com/python/cpython/issues/112645]: Remove deprecation error on passing onerror to shutil.rmtree().

• gh-112640 [https://github.com/python/cpython/issues/112640]: Add kwdefaults parameter to types.FunctionType to set default keyword argument values.

• gh-112622 [https://github.com/python/cpython/issues/112622]: Ensure name parameter is passed to event loop in asyncio.create_task().

• gh-112618 [https://github.com/python/cpython/issues/112618]: Fix a caching bug relating to typing.Annotated. Annotated[str, True] is no longer identical to Annotated[str, 1].

• gh-112334 [https://github.com/python/cpython/issues/112334]: Fixed a performance regression in 3.12's subprocess on Linux where it would no longer use the fastpath vfork() system call when it could have due to a logic bug, instead falling back to the safe but slower fork().

Also fixed a second 3.12.0 potential security bug. If a value of extra_groups=[] was passed to subprocess.Popen or related APIs, the underlying setgroups(0, NULL) system call to clear the groups list would not be made in the child process prior to exec().

This was identified via code inspection in the process of fixing the first bug.

• gh-110190 [https://github.com/python/cpython/issues/110190]: Fix ctypes structs with array on Arm platform by setting MAX_STRUCT_SIZE to 32 in stgdict. Patch by Diego Russo.

• gh-81194 [https://github.com/python/cpython/issues/81194]: Fix a crash in socket.if_indextoname() with specific value (UINT_MAX). Fix an integer overflow in socket.if_indextoname() on 64-bit non-Windows platforms.

• gh-112578 [https://github.com/python/cpython/issues/112578]: Fix a spurious RuntimeWarning when executing the zipfile module.

• gh-112516 [https://github.com/python/cpython/issues/112516]: Update the bundled copy of pip to version 23.3.1.

• gh-112510 [https://github.com/python/cpython/issues/112510]: Add readline.backend for the backend readline uses (editline or readline)

• gh-112328 [https://github.com/python/cpython/issues/112328]: [Enum] Make EnumDict, EnumDict.member_names, EnumType._add_alias_ and EnumType._add_value_alias_ public.

• gh-112509 [https://github.com/python/cpython/issues/112509]: Fix edge cases that could cause a key to be present in both the __required_keys__ and __optional_keys__ attributes of a typing.TypedDict. Patch by Jelle Zijlstra.

• gh-101336 [https://github.com/python/cpython/issues/101336]: Add keep_alive keyword parameter for AbstractEventLoop.create_server() and BaseEventLoop.create_server().

• gh-63284 [https://github.com/python/cpython/issues/63284]: Added support for TLS-PSK (pre-shared key) mode to the ssl module.

• gh-112414 [https://github.com/python/cpython/issues/112414]: Fix regression in Python 3.12 where calling repr() on a module that had been imported using a custom loader could fail with AttributeError. Patch by Alex Waygood.

• gh-112358 [https://github.com/python/cpython/issues/112358]: Revert change to struct.Struct initialization that broke some cases of subclassing.

• gh-112405 [https://github.com/python/cpython/issues/112405]: Optimize pathlib.PurePath.relative_to(). Patch by Alex Waygood.

• gh-94722 [https://github.com/python/cpython/issues/94722]: Fix bug where comparison between instances of DocTest fails if one of them has None as its lineno.

• gh-112361 [https://github.com/python/cpython/issues/112361]: Speed up a small handful of pathlib methods by removing some temporary objects.

• gh-112345 [https://github.com/python/cpython/issues/112345]: Improve error message when trying to call issubclass() against a typing.Protocol that has non-method members. Patch by Randolf Scholz.

• gh-112137 [https://github.com/python/cpython/issues/112137]: Change dis output to display no-lineno as "—" instead of "None".

• gh-112332 [https://github.com/python/cpython/issues/112332]: Deprecate the exc_type field of traceback.TracebackException. Add exc_type_str to replace it.

• gh-81620 [https://github.com/python/cpython/issues/81620]: Add extra tests for random.binomialvariate()

• gh-112292 [https://github.com/python/cpython/issues/112292]: Fix a crash in readline when imported from a sub interpreter. Patch by Anthony Shaw

• gh-77621 [https://github.com/python/cpython/issues/77621]: Slightly improve the import time of the pathlib module by deferring some imports. Patch by Barney Gale.

• gh-112137 [https://github.com/python/cpython/issues/112137]: Change dis output to display logical labels for jump targets instead of offsets.

• gh-112139 [https://github.com/python/cpython/issues/112139]: Add Signature.format() to format signatures to string with extra options. And use it in pydoc to render more readable signatures that have new lines between parameters.

• gh-112105 [https://github.com/python/cpython/issues/112105]: Make readline.set_completer_delims() work with libedit

• gh-106922 [https://github.com/python/cpython/issues/106922]: Display multiple lines with traceback when errors span multiple lines.

• gh-111874 [https://github.com/python/cpython/issues/111874]: When creating a typing.NamedTuple class, ensure _setname__() is called on all objects that define _setname__ and exist in the values of the NamedTuple class's class dictionary. Patch by Alex Waygood.

• gh-68166 [https://github.com/python/cpython/issues/68166]: Add support of the "vsapi" element type in tkinter.ttk.Style.element_create().

• gh-110275 [https://github.com/python/cpython/issues/110275]: Named tuple's methods _replace() and __replace__() now raise TypeError instead of ValueError for invalid keyword arguments.

• gh-99367 [https://github.com/python/cpython/issues/99367]: Do not mangle sys.path[0] in pdb if safe_path is set

• gh-111615 [https://github.com/python/cpython/issues/111615]: Fix a regression caused by a fix to gh-93162 [https://github.com/python/cpython/issues/93162] whereby you couldn't configure a QueueHandler without specifying handlers.

• gh-75666 [https://github.com/python/cpython/issues/75666]: Fix the behavior of tkinter widget's unbind() method with two arguments. Previously, widget.unbind(sequence, funcid) destroyed the current binding for sequence, leaving sequence unbound, and deleted the funcid command. Now it removes only funcid from the binding for sequence, keeping other commands, and deletes the funcid command. It leaves sequence unbound only if funcid was the last bound command.

• gh-67790 [https://github.com/python/cpython/issues/67790]: Implement basic formatting support (minimum width, alignment, fill) for fractions.Fraction.

• gh-111049 [https://github.com/python/cpython/issues/111049]: Fix crash during garbage collection of the io.BytesIO buffer object.

• gh-102980 [https://github.com/python/cpython/issues/102980]: Redirect the output of interact command of pdb to the same channel as the debugger. Add tests and improve docs.

• gh-102988 [https://github.com/python/cpython/issues/102988]: email.utils.getaddresses() and email.utils.parseaddr() now return ('', '') 2-tuples in more situations where invalid email addresses are encountered instead of potentially inaccurate values. Add optional strict parameter to these two functions: use strict=False to get the old behavior, accept malformed inputs. getattr(email.utils, 'supports_strict_parsing', False) can be use to check if the strict parameter is available. Patch by Thomas Dwyer and Victor Stinner to improve the CVE 2023-27043 [https://www.cve.org/CVERecord?id=CVE-2023-27043] fix.

• gh-52161 [https://github.com/python/cpython/issues/52161]: cmd.Cmd.do_help() now cleans docstrings with inspect.cleandoc() before writing them. Patch by Filip Łapkiewicz.

• gh-82300 [https://github.com/python/cpython/issues/82300]: Add track parameter to multiprocessing.shared_memory.SharedMemory that allows using shared memory blocks without having to register with the POSIX resource tracker that automatically releases them upon process exit.

• gh-110109 [https://github.com/python/cpython/issues/110109]: Add private pathlib._PurePathBase class: a base class for pathlib.PurePath that omits certain magic methods. It may be made public (along with _PathBase) in future.

• gh-109858 [https://github.com/python/cpython/issues/109858]: Protect zipfile from "quoted-overlap" zipbomb. It now raises BadZipFile when try to read an entry that overlaps with other entry or central directory.

• gh-109786 [https://github.com/python/cpython/issues/109786]: Fix possible reference leaks and crash when reenter the __next__() method of itertools.pairwise.

• gh-91539 [https://github.com/python/cpython/issues/91539]: Small (10 - 20%) and trivial performance improvement of urllib.request.getproxies_environment(), typically useful when there are many environment variables to go over.

• gh-103363 [https://github.com/python/cpython/issues/103363]: Add follow_symlinks keyword-only argument to pathlib.Path.owner() and group(), defaulting to True.

• gh-102130 [https://github.com/python/cpython/issues/102130]: Support tab completion in cmd for editline.

• gh-99437 [https://github.com/python/cpython/issues/99437]: runpy.run_path() now decodes pathlike objects, making sure file and sys.argv[0] of the module being run are always strings.

• gh-104003 [https://github.com/python/cpython/issues/104003]: Add warnings.deprecated(), a decorator to mark deprecated functions to static type checkers and to warn on usage of deprecated classes and functions. See PEP 702 [https://peps.python.org/pep-0702/]. Patch by Jelle Zijlstra.

• gh-103708 [https://github.com/python/cpython/issues/103708]: Make hardcoded python name, a configurable parameter so that different implementations of python can override it instead of making huge diffs in sysconfig.py

• gh-66515 [https://github.com/python/cpython/issues/66515]: mailbox.MH now supports folders that do not contain a .mh_sequences file (e.g. Claws Mail IMAP-cache folders). Patch by Serhiy Storchaka.

• gh-83162 [https://github.com/python/cpython/issues/83162]: Renamed re.error to PatternError for clarity, and kept re.error for backward compatibility. Patch by Matthias Bussonnier and Adam Chhina.

• gh-91133 [https://github.com/python/cpython/issues/91133]: Fix a bug in tempfile.TemporaryDirectory cleanup, which now no longer dereferences symlinks when working around file system permission errors.

• bpo-43153 [https://bugs.python.org/issue?@action=redirect&bpo=43153]: On Windows, tempfile.TemporaryDirectory previously masked a PermissionError with NotADirectoryError during directory cleanup. It now correctly raises PermissionError if errors are not ignored. Patch by Andrei Kulakov and Ken Jin.

• bpo-32731 [https://bugs.python.org/issue?@action=redirect&bpo=32731]: getpass.getuser() now raises OSError for all failures rather than ImportError on systems lacking the pwd module or KeyError if the password database is empty.

• bpo-34321 [https://bugs.python.org/issue?@action=redirect&bpo=34321]: mmap.mmap now has a trackfd parameter on Unix; if it is False, the file descriptor specified by fileno will not be duplicated.

• bpo-35332 [https://bugs.python.org/issue?@action=redirect&bpo=35332]: The shutil.rmtree() function now ignores errors when calling os.close() when ignore_errors is True, and os.close() no longer retried after error.

• bpo-35928 [https://bugs.python.org/issue?@action=redirect&bpo=35928]: io.TextIOWrapper now correctly handles the decoding buffer after read() and write().

• bpo-26791 [https://bugs.python.org/issue?@action=redirect&bpo=26791]: shutil.move() now moves a symlink into a directory when that directory is the target of the symlink. This provides the same behavior as the mv shell command. The previous behavior raised an exception. Patch by Jeffrey Kintscher.

• bpo-41422 [https://bugs.python.org/issue?@action=redirect&bpo=41422]: Fixed memory leaks of pickle.Pickler and pickle.Unpickler involving cyclic references via the internal memo mapping.

• bpo-19821 [https://bugs.python.org/issue?@action=redirect&bpo=19821]: The pydoc.ispackage() function has been deprecated.

• bpo-40262 [https://bugs.python.org/issue?@action=redirect&bpo=40262]: The ssl.SSLSocket.recv_into() method no longer requires the buffer argument to implement __len__ and supports buffers with arbitrary item size.

• bpo-39912 [https://bugs.python.org/issue?@action=redirect&bpo=39912]: warnings.filterwarnings() and warnings.simplefilter() now raise appropriate exceptions instead of AssertionError. Patch contributed by Rémi Lapeyre.

• bpo-37260 [https://bugs.python.org/issue?@action=redirect&bpo=37260]: Fixed a race condition in shutil.rmtree() in which directory entries removed by another process or thread while shutil.rmtree() is running can cause it to raise FileNotFoundError. Patch by Jeffrey Kintscher.

• bpo-36959 [https://bugs.python.org/issue?@action=redirect&bpo=36959]: Fix some error messages for invalid ISO format string combinations in strptime() that referred to directives not contained in the format string. Patch by Gordon P. Hemsley.

• bpo-18060 [https://bugs.python.org/issue?@action=redirect&bpo=18060]: Fixed a class inheritance issue that can cause segfaults when deriving two or more levels of subclasses from a base class of Structure or Union.

• bpo-29779 [https://bugs.python.org/issue?@action=redirect&bpo=29779]: Add a new PYTHON_HISTORY environment variable to set the location of a .python_history file.

• bpo-21360 [https://bugs.python.org/issue?@action=redirect&bpo=21360]: mailbox.Maildir now ignores files with a leading dot.