Changelog¶

gh-142594: Fix crash in TextIOWrapper.close() when the underlying buffer’s closed property calls detach().

gh-142451: hmac: Ensure that the HMAC.block_size attribute is correctly copied by HMAC.copy. Patch by Bénédikt Tran.

gh-142495: collections.defaultdict now prioritizes __setitem__() when inserting default values from default_factory. This prevents race conditions where a default value would overwrite a value set before default_factory returns.

gh-142651: unittest.mock: fix a thread safety issue where Mock.call_count may return inaccurate values when the mock is called concurrently from multiple threads.

gh-142595: Added type check during initialization of the decimal module to prevent a crash in case of broken stdlib. Patch by Sergey B Kirpichev.

gh-142556: Fix crash when a task gets re-registered during finalization in asyncio. Patch by Kumar Aditya.

gh-123241: Avoid reference count operations in garbage collection of ctypes objects.

gh-112527: The help text for required options in argparse no longer extended with “ (default: None)”.

gh-142346: Fix usage formatting for mutually exclusive groups in argparse when they are preceded by positional arguments or followed or intermixed with other optional arguments.

gh-142315: Pdb can now run scripts from anonymous pipes used in process substitution. Patch by Bartosz Sławecki.

gh-142332: Fix usage formatting for positional arguments in mutually exclusive groups in argparse. in argparse.

gh-142282: Fix winreg.QueryValueEx() to not accidentally read garbage buffer under race condition.

gh-75949: Fix argparse to preserve | separators in mutually exclusive groups when the usage line wraps due to length.

gh-142267: Improve argparse performance by caching the formatter used for argument validation.

gh-68552: MisplacedEnvelopeHeaderDefect and Missing header name defects are now correctly passed to the handle_defect method of policy in FeedParser.

gh-142006: Fix a bug in the email.policy.default folding algorithm which incorrectly resulted in a doubled newline when a line ending at exactly max_line_length was followed by an unfoldable token.

gh-105836: Fix asyncio.run_coroutine_threadsafe() leaving underlying cancelled asyncio task running.

gh-142737: Tracebacks will be displayed in fallback mode even if io.open() is lost. Previously, this would crash the interpreter. Patch by Bartosz Sławecki.

gh-142554: Fix a crash in divmod() when _pylong.int_divmod() does not return a tuple of length two exactly. Patch by Bénédikt Tran.

gh-142531: Fix a free-threaded GC performance regression. If there are many untracked tuples, the GC will run too often, resulting in poor performance. The fix is to include untracked tuples in the “long lived” object count. The number of frozen objects is also now included since the free-threaded GC must scan those too.

gh-142402: Fix reference counting when adjacent literal parts are merged while constructing string.templatelib.Template, preventing the displaced string object from leaking.

gh-133932: Fix crash in the free threading build when clearing frames that hold tagged integers.

gh-142343: Fix SIGILL crash on m68k due to incorrect assembly constraint.

gh-137007: Fix a bug during JIT compilation failure which caused garbage collection debug assertions to fail.

gh-142589: Fix PyUnstable_Object_IsUniqueReferencedTemporary() handling of tagged ints on the interpreter stack.

gh-142571: PyUnstable_CopyPerfMapFile() now checks that opening the file succeeded before flushing.

gh-142454: When calculating the digest of the JIT stencils input, sort the hashed files by filenames before adding their content to the hasher. This ensures deterministic hash input and hence deterministic hash, independent on filesystem order.

gh-141808: When running make clean-retain-profile, keep the generated JIT stencils. That way, the stencils are not generated twice when Profile-guided optimization (PGO) is used. It also allows distributors to supply their own pre-built JIT stencils.

gh-138061: Ensure reproducible builds by making JIT stencil header generation deterministic.

gh-142145: Remove quadratic behavior in xml.minidom node ID cache clearing.

gh-119452: Fix a potential memory denial of service in the http.server module. When a malicious user is connected to the CGI server on Windows, it could cause an arbitrary amount of memory to be allocated. This could have led to symptoms including a MemoryError, swapping, out of memory (OOM) killed processes or containers, or even system crashes.

gh-142218: Fix crash when inserting into a split table dictionary with a non str key that matches an existing key.

gh-116738: Fix cmath data race when initializing trigonometric tables with subinterpreters.

gh-139810: Installing with py install 3[.x]-dev will now select final versions as well as prereleases.

gh-141692: Each slice of an iOS XCframework now contains a lib folder that contains a symlink to the libpython dylib. This allows binary modules to be compiled for iOS using dynamic libreary linking, rather than Framework linking.

gh-141442: The iOS testbed now correctly handles test arguments that contain spaces.

gh-140702: The iOS testbed app will now expose the GITHUB_ACTIONS environment variable to iOS apps being tested.

gh-137484: Have Tools/wasm/wasi put the build Python into a directory named after the build triple instead of “build”.

gh-137248: Add a --logdir option to Tools/wasm/wasi for specifying where to write log files.

gh-137243: Have Tools/wasm/wasi detect a WASI SDK install in /opt when it was directly extracted from a release tarball.

gh-140482: Preserve and restore the state of stty echo as part of the test environment.

gh-140082: Update python -m test to set FORCE_COLOR=1 when being run with color enabled so that unittest which is run by it with redirected output will output in color.

gh-139208: Fix regrtest --fast-ci --verbose: don’t ignore the --verbose option anymore. Patch by Victor Stinner.

gh-136442: Use exitcode 1 instead of 5 if unittest.TestCase.setUpClass() raises an exception

gh-139700: Check consistency of the zip64 end of central directory record. Support records with “zip64 extensible data” if there are no bytes prepended to the ZIP file.

gh-139283: sqlite3: correctly handle maximum number of rows to fetch in Cursor.fetchmany and reject negative values for Cursor.arraysize. Patch by Bénédikt Tran.

gh-137836: Add support of the “plaintext” element, RAWTEXT elements “xmp”, “iframe”, “noembed” and “noframes”, and optionally RAWTEXT element “noscript” in html.parser.HTMLParser.

gh-136063: email.message: ensure linear complexity for legacy HTTP parameters parsing. Patch by Bénédikt Tran.

gh-136065: Fix quadratic complexity in os.path.expandvars().

gh-119451: Fix a potential memory denial of service in the http.client module. When connecting to a malicious server, it could cause an arbitrary amount of memory to be allocated. This could have led to symptoms including a MemoryError, swapping, out of memory (OOM) killed processes or containers, or even system crashes.

gh-119342: Fix a potential memory denial of service in the plistlib module. When reading a Plist file received from untrusted source, it could cause an arbitrary amount of memory to be allocated. This could have led to symptoms including a MemoryError, swapping, out of memory (OOM) killed processes or containers, or even system crashes.

gh-96491: Deduplicate version number in IDLE shell title bar after saving to a file.

gh-139742: Colorize t-string prefixes for template strings in IDLE, as done for f-string prefixes.

gh-141994: xml.sax.handler: Make Documentation of xml.sax.handler.feature_external_ges warn of opening up to external entity attacks. Patch by Sebastian Pipping.

gh-140578: Remove outdated sencence in the documentation for multiprocessing, that implied that concurrent.futures.ThreadPoolExecutor did not exist.

gh-142048: Fix quadratically increasing garbage collection delays in free-threaded build.

gh-116738: Fix thread safety issue with re scanner objects in free-threaded builds.

gh-141930: When importing a module, use Python’s regular file object to ensure that writes to .pyc files are complete or an appropriate error is raised.

gh-120158: Fix inconsistent state when enabling or disabling monitoring events too many times.

gh-139653: Only raise a RecursionError or trigger a fatal error if the stack pointer is both below the limit pointer and above the stack base. If outside of these bounds assume that it is OK. This prevents false positives when user-space threads swap stacks.

gh-139103: Improve multithreaded scaling of dataclasses on the free-threaded build.

gh-141579: Fix sys.activate_stack_trampoline() to properly support the perf_jit backend. Patch by Pablo Galindo.

gh-114203: Skip locking if object is already locked by two-mutex critical section.

gh-141528: Suggest using concurrent.interpreters.Interpreter.close() instead of the private _interpreters.destroy function when warning about remaining subinterpreters. Patch by Sergey Miryanov.

gh-141312: Fix the assertion failure in the __setstate__ method of the range iterator when a non-integer argument is passed. Patch by Sergey Miryanov.

gh-116738: Make csv module thread-safe on the free threaded build.

gh-140939: Fix memory leak when bytearray or bytes is formated with the %*b format with a large width that results in a MemoryError.

gh-140260: Fix struct data race in endian table initialization with subinterpreters. Patch by Shamil Abdulaev.

gh-140530: Fix a reference leak when raise exc from cause fails. Patch by Bénédikt Tran.

gh-140373: Correctly emit PY_UNWIND event when generator object is closed. Patch by Mikhail Efimov.

gh-140576: Fixed crash in tokenize.generate_tokens() in case of specific incorrect input. Patch by Mikhail Efimov.

gh-140551: Fixed crash in dict if dict.clear() is called at the lookup stage. Patch by Mikhail Efimov and Inada Naoki.

gh-140517: Fixed a reference leak when iterating over the result of map() with strict=True when the input iterables have different lengths. Patch by Mikhail Efimov.

gh-140471: Fix potential buffer overflow in ast.AST node initialization when encountering malformed _fields containing non-str.

gh-140431: Fix a crash in Python’s garbage collector due to partially initialized coroutine objects when coroutine origin tracking depth is enabled (sys.set_coroutine_origin_tracking_depth()).

gh-140398: Fix memory leaks in readline functions read_init_file(), read_history_file(), write_history_file(), and append_history_file() when PySys_Audit() fails.

gh-140406: Fix memory leak when an object’s __hash__() method returns an object that isn’t an int.

gh-140358: Restore elapsed time and unreachable object count in GC debug output. These were inadvertently removed during a refactor of gc.c. The debug log now again reports elapsed collection time and the number of unreachable objects. Contributed by Pål Grønås Drange.

gh-140306: Fix memory leaks in cross-interpreter channel operations and shared namespace handling.

gh-140301: Fix memory leak of PyConfig in subinterpreters.

gh-140257: Fix data race between interpreter_clear() and take_gil() on eval_breaker during finalization with daemon threads.

gh-139951: Fixes a regression in GC performance for a growing heap composed mostly of small tuples.

• Counts number of actually tracked objects, instead of trackable objects. This ensures that untracking tuples has the desired effect of reducing GC overhead.

• Does not track most untrackable tuples during creation. This prevents large numbers of small tuples causing excessive GCs.

gh-140104: Fix a bug with exception handling in the JIT. Patch by Ken Jin. Bug reported by Daniel Diniz.

gh-140061: Fixing the checking of whether an object is uniquely referenced to ensure free-threaded compatibility. Patch by Sergey Miryanov.

gh-140067: Fix memory leak in sub-interpreter creation.

gh-140000: Fix potential memory leak when a reference cycle exists between an instance of typing.TypeAliasType, typing.TypeVar, typing.ParamSpec, or typing.TypeVarTuple and its __name__ attribute. Patch by Mikhail Efimov.

gh-139914: Restore support for HP PA-RISC, which has an upwards-growing stack.

gh-139988: Fix a memory leak when failing to create a Union type. Patch by Bénédikt Tran.

gh-139748: Fix reference leaks in error branches of functions accepting path strings or bytes such as compile() and os.system(). Patch by Bénédikt Tran.

gh-139516: Fix lambda colon erroneously start format spec in f-string in tokenizer.

gh-139640: ast.parse() no longer emits syntax warnings for return/break/continue in finally (see PEP 765) – they are only emitted during compilation.

gh-139640: Fix swallowing some syntax warnings in different modules if they accidentally have the same message and are emitted from the same line. Fix duplicated warnings in the finally block.

gh-63161: Support non-UTF-8 shebang and comments in Python source files if non-UTF-8 encoding is specified. Detect decoding error in comments for default (UTF-8) encoding. Show the line and position of decoding error for default encoding in a traceback. Show the line containing the coding cookie when it conflicts with the BOM in a traceback.

gh-116738: Make mmap thread-safe on the free threaded build.

gh-138558: Fix handling of unusual t-string annotations in annotationlib. Patch by Dave Peck.

gh-134466: Don’t run PyREPL in a degraded environment where setting termios attributes is not allowed.

gh-138944: Fix SyntaxError message when invalid syntax appears on the same line as a valid import ... as ... or from ... import ... as ... statement. Patch by Brian Schubert.

gh-105487: Remove non-existent __copy__(), __deepcopy__(), and __bases__ from the __dir__() entries of types.GenericAlias.

gh-69605: Fix some standard library submodules missing from the REPL auto-completion of imports.

gh-116738: Make cProfile thread-safe on the free threaded build.

gh-138004: On Solaris/Illumos platforms, thread names are now encoded as ASCII to avoid errors on systems (e.g. OpenIndiana) that don’t support non-ASCII names.

gh-137433: Fix a potential deadlock in the free threading build when daemon threads enable or disable profiling or tracing while the main thread is shutting down the interpreter.

gh-137400: Fix a crash in the free threading build when disabling profiling or tracing across all threads with PyEval_SetProfileAllThreads() or PyEval_SetTraceAllThreads() or their Python equivalents threading.settrace_all_threads() and threading.setprofile_all_threads().

gh-58124: Fix name of the Python encoding in Unicode errors of the code page codec: use “cp65000” and “cp65001” instead of “CP_UTF7” and “CP_UTF8” which are not valid Python code names. Patch by Victor Stinner.

gh-132657: Improve performance of frozenset by removing locks in the free-threading build.

gh-133400: Fixed Ctrl+D (^D) behavior in _pyrepl module to match old pre-3.13 REPL behavior.

gh-128640: Fix a crash when using threads inside of a subinterpreter.

gh-137422: Fix free threading race condition in PyImport_AddModuleRef(). It was previously possible for two calls to the function return two different objects, only one of which was stored in sys.modules.

gh-140042: Removed the sqlite3_shutdown call that could cause closing connections for sqlite when used with multiple sub interpreters.

gh-141042: Make qNaN in PyFloat_Pack2() and PyFloat_Pack4(), if while conversion to a narrower precision floating-point format — the remaining after truncation payload will be zero. Patch by Sergey B Kirpichev.

gh-140487: Fix Py_RETURN_NOTIMPLEMENTED in limited C API 3.11 and older: don’t treat Py_NotImplemented as immortal. Patch by Victor Stinner.

gh-140153: Fix Py_REFCNT() definition on limited C API 3.11-3.13. Patch by Victor Stinner.

gh-139653: Add PyUnstable_ThreadState_SetStackProtection() and PyUnstable_ThreadState_ResetStackProtection() functions to set the stack protection base address and stack protection size of a Python thread state. Patch by Victor Stinner.

gh-124111: Update macOS installer to use Tcl/Tk 8.6.17.

gh-139573: Updated bundled version of OpenSSL to 3.0.18.

gh-139573: Updated bundled version of OpenSSL to 3.0.18.

gh-139330: SBOM generation tool didn’t cross-check the version and checksum values against the Modules/expat/refresh.sh script, leading to the values becoming out-of-date during routine updates.

gh-132006: XCframeworks now include privacy manifests to satisfy Apple App Store submission requirements.

gh-138171: A script for building an iOS XCframework was added. As part of this change, the top level iOS folder has been moved to be a subdirectory of the Apple folder.

gh-139400: xml.parsers.expat: Make sure that parent Expat parsers are only garbage-collected once they are no longer referenced by subparsers created by ExternalEntityParserCreate(). Patch by Sebastian Pipping.

gh-139312: Upgrade bundled libexpat to 2.7.3

gh-138896: Fix error installing C runtime on non-updated Windows machines

gh-137873: The iOS test runner has been simplified, resolving some issues that have been observed using the runner in GitHub Actions and Azure Pipelines test environments.

gh-135661: Fix CDATA section parsing in html.parser.HTMLParser according to the HTML5 standard: ] ]> and ]] > no longer end the CDATA section. Add private method _set_support_cdata() which can be used to specify how to parse <[CDATA[ — as a CDATA section in foreign content (SVG or MathML) or as a bogus comment in the HTML namespace.

gh-138998: Update bundled libexpat to 2.7.2

gh-118803: Add back collections.abc.ByteString and typing.ByteString. Both had been removed in prior alpha, beta and release candidates for Python 3.14, but their removal has now been postponed to Python 3.17.

gh-137226: Fix typing.get_type_hints() calls on generic typing.TypedDict classes defined with string annotations.

gh-138804: Raise TypeError instead of AttributeError when an argument of incorrect type is passed to shlex.quote(). This restores the behavior of the function prior to 3.14.

gh-128636: Fix crash in PyREPL when os.environ is overwritten with an invalid value for mac

gh-138514: Raise ValueError when a multi-character string is passed to the echo_char parameter of getpass.getpass(). Patch by Benjamin Johnson.

gh-138515: email is added to Emscripten build.

gh-99948: ctypes.util.find_library() now works in Emscripten build.

gh-138253: Add the block parameter in the put() and get() methods of the concurrent.interpreters queues for compatibility with the queue.Queue interface.

gh-138133: Prevent infinite traceback loop when sending CTRL^C to Python through strace.

gh-134869: Fix an issue where pressing Ctrl+C during tab completion in the REPL would leave the autocompletion menu in a corrupted state.

gh-90548: Fix musl detection for platform.libc_ver() on Alpine Linux if compiled with –strip-all.

gh-136134: SMTP.auth_cram_md5() now raises an SMTPException instead of a ValueError if Python has been built without MD5 support. In particular, SMTP clients will not attempt to use this method even if the remote server is assumed to support it. Patch by Bénédikt Tran.

gh-136134: IMAP4.login_cram_md5 now raises an IMAP4.error if CRAM-MD5 authentication is not supported. Patch by Bénédikt Tran.

gh-134953: Expand _colorize theme with keyword_constant and implement in repl.

gh-71810: Raise OverflowError for (-1).to_bytes() for signed conversions when bytes count is zero. Patch by Sergey B Kirpichev.

gh-138192: Fix contextvars initialization so that all subinterpreters are assigned the MISSING value.

gh-138479: Fix a crash when a generic object’s __typing_subst__ returns an object that isn’t a tuple.

gh-138372: Fix SyntaxWarning emitted for erroneous subscript expressions involving template string literals. Patch by Brian Schubert.

gh-138318: The default REPL now avoids highlighting built-in names (for instance set or format()) when they are used as attribute names (for instance in value.set or text.format).

gh-138349: Fix crash in certain cases where a module contains both a module-level annotation and a comprehension.

gh-137384: Fix a crash when using the warnings module in a finalizer at shutdown. Patch by Kumar Aditya.

gh-137883: Fix runaway recursion when calling a function with keyword arguments.

gh-137079: Fix keyword typo recognition when parsing files. Patch by Pablo Galindo.

gh-137728: Fix the JIT’s handling of many local variables. This previously caused a segfault.

gh-137576: Fix for incorrect source code being shown in tracebacks from the Basic REPL when PYTHONSTARTUP is given. Patch by Adam Hartz.

gh-137450: macOS installer shell path management improvements: separate the installer Shell profile updater postinstall script from the Update Shell Profile.command to enable more robust error handling.

gh-137134: Update macOS installer to ship with SQLite version 3.50.4.

gh-137134: Update Windows installer to ship with SQLite 3.50.4.

gh-137426: Remove the code deprecation of importlib.abc.ResourceLoader. It is documented as deprecated, but left for backwards compatibility with other classes in importlib.abc.

gh-137282: Fix tab completion and dir() on concurrent.futures.

gh-137257: Bump the version of pip bundled in ensurepip to version 25.2

gh-137226: Fix behavior of annotationlib.ForwardRef.evaluate() when the type_params parameter is passed and the name of a type param is also present in an enclosing scope.

gh-130522: Fix unraisable TypeError raised during interpreter shutdown in the threading module.

gh-137059: Fix handling of file URLs with a Windows drive letter in the URL authority by urllib.request.url2pathname(). This fixes a regression in earlier pre-releases of Python 3.14.

gh-130577: tarfile now validates archives to ensure member offsets are non-negative. (Contributed by Alexander Enrique Urieles Nieto in gh-130577.)

gh-135228: When dataclasses replaces a class with a slotted dataclass, the original class can now be garbage collected again. Earlier changes in Python 3.14 caused this class to always remain in existence together with the replacement class synthesized by dataclasses.

gh-136155: We are now checking for fatal errors in EPUB builds in CI.

gh-137400: Fix a crash in the free threading build when disabling profiling or tracing across all threads with PyEval_SetProfileAllThreads() or PyEval_SetTraceAllThreads() or their Python equivalents threading.settrace_all_threads() and threading.setprofile_all_threads().

gh-137314: Fixed a regression where raw f-strings incorrectly interpreted escape sequences in format specifications. Raw f-strings now properly preserve literal backslashes in format specs, matching the behavior from Python 3.11. For example, rf"{obj:\xFF}" now correctly produces '\\xFF' instead of 'ÿ'. Patch by Pablo Galindo.

gh-137308: A standalone docstring in a node body is optimized as a pass statement to ensure that the node’s body is never empty. There was a ValueError in compile() otherwise.

gh-137288: Fix bug where some bytecode instructions of a boolean expression are not associated with the correct exception handler.

gh-134291: Remove some newer macOS API usage from the JIT compiler in order to restore compatibility with older OSX 10.15 deployment targets.

gh-131338: Disable computed stack limit checks on non-glibc linux platforms to fix crashes on deep recursion.

gh-136870: Fix data races while de-instrumenting bytecode of code objects running concurrently in threads.

gh-137573: Mark _PyOptimizer_Optimize as Py_NO_INLINE to prevent stack overflow crashes on macOS.

gh-132339: Add support for OpenSSL 3.5.

gh-136251: Fixes and usability improvements for Tools/wasm/emscripten/web_example

gh-135661: Fix parsing attributes with whitespaces around the = separator in html.parser.HTMLParser according to the HTML5 standard.

gh-118350: Fix support of escapable raw text mode (elements “textarea” and “title”) in html.parser.HTMLParser.

gh-136170: Removed the unreleased zipfile.ZipFile.data_offset property added in 3.14.0a7 as it wasn’t fully clear which behavior it should have in some situations so the result was not always what a user might expect.

gh-124621: pyrepl now works in Emscripten.

gh-136874: Discard URL query and fragment in urllib.request.url2pathname().

gh-130645: Enable color help by default in argparse.

gh-136549: Fix signature of threading.excepthook().

gh-136523: Fix wave.Wave_write emitting an unraisable when open raises.

gh-52876: Add missing keepends (default True) parameter to codecs.StreamReaderWriter.readline() and codecs.StreamReaderWriter.readlines().

gh-136470: Correct concurrent.futures.InterpreterPoolExecutor’s default thread name.

gh-136476: Fix a bug that was causing the get_async_stack_trace function to miss some frames in the stack trace.

gh-136434: Fix docs generation of UnboundItem in concurrent.interpreters when running with -OO.

gh-136380: Raises AttributeError when accessing concurrent.futures.InterpreterPoolExecutor and subinterpreters are not available.

gh-134759: Fix UnboundLocalError in email.message.Message.get_payload() when the payload to decode is a bytes object. Patch by Kliment Lamonov.

gh-134657: asyncio: Remove some private names from asyncio.__all__.

gh-136801: Fix PyREPL syntax highlighting on match cases after multi-line case. Contributed by Olga Matoula.

gh-136421: Fix crash when initializing datetime concurrently.

gh-116738: Make functions in grp thread-safe on the free threaded build.

gh-135148: Fixed a bug where f-string debug expressions (using =) would incorrectly strip out parts of strings containing escaped quotes and # characters. Patch by Pablo Galindo.

gh-133136: Limit excess memory usage in the free threading build when a large dictionary or list is resized and accessed by multiple threads.

gh-91153: Fix a crash when a bytearray is concurrently mutated during item assignment.

gh-127971: Fix off-by-one read beyond the end of a string in string search.

gh-112068: Revert support of nullable arguments in PyArg_Parse().

gh-133296: New variants for the critical section API that accept one or two PyMutex pointers rather than PyObject instances are now public in the non-limited C API.

gh-134009: Expose PyMutex_IsLocked() as part of the public C API.

gh-135621: PyREPL no longer depends on the curses standard library. Contributed by Łukasz Langa.

gh-135966: The iOS testbed now handles the app_packages folder as a site directory.

gh-135494: Fix regrtest to support excluding tests from --pgo tests. Patch by Victor Stinner.

gh-136053: marshal: fix a possible crash when deserializing slice objects.

gh-135661: Fix parsing start and end tags in html.parser.HTMLParser according to the HTML5 standard.

• Whitespaces no longer accepted between </ and the tag name. E.g. </ script> does not end the script section.

• Vertical tabulation (\v) and non-ASCII whitespaces no longer recognized as whitespaces. The only whitespaces are \t\n\r\f and space.

• Null character (U+0000) no longer ends the tag name.

• Attributes and slashes after the tag name in end tags are now ignored, instead of terminating after the first > in quoted attribute value. E.g. </script/foo=">"/>.

• Multiple slashes and whitespaces between the last attribute and closing > are now ignored in both start and end tags. E.g. <a foo=bar/ //>.

• Multiple = between attribute name and value are no longer collapsed. E.g. <a foo==bar> produces attribute “foo” with value “=bar”.

• [Reverted in gh-136927] Whitespaces between the = separator and attribute name or value are no longer ignored. E.g. <a foo =bar> produces two attributes “foo” and “=bar”, both with value None; <a foo= bar> produces two attributes: “foo” with value “” and “bar” with value None.

gh-102555: Fix comment parsing in html.parser.HTMLParser according to the HTML5 standard. --!> now ends the comment. -- > no longer ends the comment. Support abnormally ended empty comments <--> and <--->.

gh-136286: Fix pickling failures for protocols 0 and 1 for many objects realted to subinterpreters.

gh-136316: Improve support for evaluating nested forward references in typing.evaluate_forward_ref().

gh-85702: If zoneinfo._common.load_tzdata is given a package without a resource a zoneinfo.ZoneInfoNotFoundError is raised rather than a PermissionError. Patch by Victor Stinner.

gh-136028: Fix parsing month names containing “İ” (U+0130, LATIN CAPITAL LETTER I WITH DOT ABOVE) in time.strptime(). This affects locales az_AZ, ber_DZ, ber_MA and crh_UA.

gh-135995: In the palmos encoding, make byte 0x9b decode to › (U+203A - SINGLE RIGHT-POINTING ANGLE QUOTATION MARK).

gh-53203: Fix time.strptime() for %c and %x formats on locales byn_ER, wal_ET and lzh_TW, and for %X format on locales ar_SA, bg_BG and lzh_TW.

gh-91555: An earlier change, which was introduced in 3.14.0b2, has been reverted. It disabled logging for a logger during handling of log messages for that logger. Since the reversion, the behaviour should be as it was before 3.14.0b2.

gh-135878: Fixes a crash of types.SimpleNamespace on free threading builds, when several threads were calling its __repr__() method at the same time.

gh-135836: Fix IndexError in asyncio.loop.create_connection() that could occur when non-OSError exception is raised during connection and socket’s close() raises OSError.

gh-135836: Fix IndexError in asyncio.loop.create_connection() that could occur when the Happy Eyeballs algorithm resulted in an empty exceptions list during connection attempts.

gh-135855: Raise TypeError instead of SystemError when _interpreters.set___main___attrs() is passed a non-dict object. Patch by Brian Schubert.

gh-135815: netrc: skip security checks if os.getuid() is missing. Patch by Bénédikt Tran.

gh-135640: Address bug where it was possible to call xml.etree.ElementTree.ElementTree.write() on an ElementTree object with an invalid root element. This behavior blanked the file passed to write if it already existed.

gh-135645: Added supports_isolated_interpreters field to sys.implementation.

gh-135646: Raise consistent NameError exceptions in annotationlib.ForwardRef.evaluate()

gh-135557: Fix races on heapq updates and list reads on the free threaded build.

gh-119180: Only fetch globals and locals if necessary in annotationlib.get_annotations()

gh-135561: Fix a crash on DEBUG builds when an HACL* HMAC routine fails. Patch by Bénédikt Tran.

gh-135487: Fix reprlib.Repr.repr_int() when given integers with more than sys.get_int_max_str_digits() digits. Patch by Bénédikt Tran.

gh-135335: multiprocessing: Flush stdout and stderr after preloading modules in the forkserver.

gh-135069: Fix the “Invalid error handling” exception in encodings.idna.IncrementalDecoder to correctly replace the ‘errors’ parameter.

gh-130662: +Accept leading zeros in precision and width fields for +:class:Decimal formatting, for example format(Decimal(1.25), '.016f').

gh-130662: Accept leading zeros in precision and width fields for Fraction formatting, for example format(Fraction(1, 3), '.016f').

gh-87790: Support underscore and comma as thousands separators in the fractional part for Fraction’s formatting. Patch by Sergey B Kirpichev.

gh-87790: Support underscore and comma as thousands separators in the fractional part for Decimal’s formatting. Patch by Sergey B Kirpichev.

gh-130664: Handle corner-case for Fraction’s formatting: treat zero-padding (preceding the width field by a zero ('0') character) as an equivalent to a fill character of '0' with an alignment type of '=', just as in case of float’s.

gh-136155: EPUB builds are fixed by excluding non-XHTML-compatible tags.

gh-109700: Fix memory error handling in PyDict_SetDefault().

gh-78465: Fix error message for cls.__new__(cls, ...) where cls is not instantiable builtin or extension type (with tp_new set to NULL).

gh-129958: Differentiate between t-strings and f-strings in syntax error for newlines in format specifiers of single-quoted interpolated strings.

gh-135871: Non-blocking mutex lock attempts now return immediately when the lock is busy instead of briefly spinning in the free threading build.

gh-135106: Restrict the trashcan mechanism to GC’ed objects and untrack them while in the trashcan to prevent the GC and trashcan mechanisms conflicting.

gh-135607: Fix potential weakref races in an object’s destructor on the free threaded build.

gh-135608: Fix a crash in the JIT involving attributes of modules.

gh-135543: Emit sys.remote_exec audit event when sys.remote_exec() is called and migrate remote_debugger_script to cpython.remote_debugger_script.

gh-134280: Disable constant folding for ~ with a boolean argument. This moves the deprecation warning from compile time to runtime.

gh-135906: Fix compilation errors when compiling the internal headers with a C++ compiler.

gh-134273: Add support for configuring compiler flags for the JIT with CFLAGS_JIT

gh-135099: Fix a crash that could occur on Windows when a background thread waits on a PyMutex while the main thread is shutting down the interpreter.

gh-132815: Fix test__opcode: add JUMP_BACKWARD to specialization stats.