Python-3.15.0a5.tar.xz

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Update to 3.15.0a5: - Tools/Demos - gh-142095: Make gdb ‘py-bt’ command use frame from thread local state when available. Patch by Sam Gross and Victor Stinner. - Tests - gh-143460: Skip tests relying on infinite recusion if stack size is unlimited. - gh-143553: Add support for parametrized resources, such as -u xpickle=2.7. - bpo-31391: Forward-port test_xpickle from Python 2 to Python 3 and add the resource back to test’s command line. - Library - gh-143706: Fix multiprocessing forkserver so that sys.argv is correctly set before __main__ is preloaded. Previously, sys.argv was empty during main module import in forkserver child processes. This fixes a regression introduced in 3.13.8 and 3.14.1. Root caused by Aaron Wieczorek, test provided by Thomas Watson, thanks! - gh-143638: Forbid reentrant calls of the pickle.Pickler and pickle.Unpickler methods for the C implementation. Previously, this could cause crash or data corruption, now concurrent calls of methods of the same object raise RuntimeError. - gh-143658: importlib.metadata: Use str.translate() to improve performance of importlib.metadata.Prepared.normalize(). Patch by Hugo van Kemenade and Henry Schreiner. - gh-78724: Raise RuntimeError’s when user attempts to call methods on half-initialized Struct objects, For example, created by Struct.__new__(Struct). Patch by Sergey B Kirpichev. - gh-143196: Fix crash when the internal encoder object returned by undocumented function json.encoder.c_make_encoder() was called with non-zero second (_current_indent_level) argument. - gh-143191: _thread.stack_size() now raises ValueError if the stack size is too small. Patch by Victor Stinner. - gh-143547: Fix sys.unraisablehook() when the hook raises an exception and changes sys.unraisablehook(): hold a strong reference to the old hook. Patch by Victor Stinner. - gh-139686: Revert 0a97941245f1dda6d838f9aaf0512104e5253929 and 57db12514ac686f0a752ec8fe1c08b6daa0c6219 which made importlib.reload a no-op for lazy modules; caused Buildbot failures. - gh-143517: annotationlib.get_annotations() no longer raises a SyntaxError when evaluating a stringified starred annotation that starts with one or more whitespace characters followed by a *. Patch by Bartosz Sławecki. - gh-143474: Add os.RWF_ATOMIC constant for Linux 6.11+. - gh-143445: Speed up copy.deepcopy() by 1.04x. - gh-143378: Fix use-after-free crashes when a BytesIO object is concurrently mutated during write() or writelines(). - gh-143368: Fix endless retry loop in profiling.sampling blocking mode when threads cannot be seized due to EPERM. Such threads are now skipped instead of causing repeated error messages. Patch by Pablo Galindo. - gh-143346: Fix incorrect wrapping of the Base64 data in plistlib._PlistWriter when the indent contains a mix of tabs and spaces. - gh-140025: queue: Fix SimpleQueue.__sizeof__() computation. - gh-143310: tkinter: fix a crash when a Python list is mutated during the conversion to a Tcl object (e.g., when setting a Tcl variable). Patch by Bénédikt Tran. - gh-143309: Fix a crash in os.execve() on non-Windows platforms when given a custom environment mapping which is then mutated during parsing. Patch by Bénédikt Tran. - gh-143308: pickle: fix use-after-free crashes when a PickleBuffer is concurrently mutated by a custom buffer callback during pickling. Patch by Bénédikt Tran and Aaron Wieczorek. - gh-142939: Performance optimisations for difflib.get_close_matches() - gh-124951: The base64 implementation behind the binascii, base64, and related codec has been optimized for modern pipelined CPU architectures and now performs 2-3x faster across all platforms. - gh-143237: Fix support of named pipes in the rotating logging handlers. - gh-143249: Fix possible buffer leaks in Windows overlapped I/O on error handling. - gh-143241: zoneinfo: fix infinite loop in ZoneInfo.from_file when parsing a malformed TZif file. Patch by Fatih Celik. - gh-142830: sqlite3: fix use-after-free crashes when the connection’s callbacks are mutated during a callback execution. Patch by Bénédikt Tran. - gh-143200: xml.etree.ElementTree: fix use-after-free crashes in __getitem__() and __setitem__() methods of Element when the element is concurrently mutated. Patch by Bénédikt Tran. - gh-143214: Add the wrapcol parameter in binascii.b2a_base64() and base64.b64encode(). - gh-142195: Updated timeout evaluation logic in subprocess to be compatible with deterministic environments like Shadow where time moves exactly as requested. - gh-140739: Fix several crashes due to reading invalid memory in the new Tachyon sampling profiler. Patch by Pablo Galindo. - gh-142164: Fix the ctypes bitfield overflow error message to report the correct offset and size calculation. - gh-143145: Fixed a possible reference leak in ctypes when constructing results with multiple output parameters on error. - gh-143103: Add padding support to base64.z85encode() via the pad parameter. - gh-130796: Undeprecate the locale.getdefaultlocale() function. Patch by Victor Stinner. - gh-74902: Add the iter_graphemes() function in the unicodedata module to iterate over grapheme clusters according to rules defined in Unicode Standard Annex #29, “Unicode Text Segmentation”. Add grapheme_cluster_break(), indic_conjunct_break() and extended_pictographic() functions to get the properties of the character which are related to the above algorithm. - gh-143004: Fix a potential use-after-free in collections.Counter.update() when user code mutates the Counter during an update. - gh-140648: The asyncio REPL now respects the -I flag (isolated mode). Previously, it would load and execute PYTHONSTARTUP even if the flag was set. Contributed by Bartosz Sławecki. - gh-142991: Fixed socket operations such as recvfrom() and sendto() for FreeBSD divert(4) socket. - gh-116738: Make the attributes in lzma thread-safe on the free threaded build. - gh-142950: Fix regression in argparse where format specifiers in help strings raised ValueError. - gh-142881: Fix concurrent and reentrant call of atexit.unregister(). - gh-142615: Fix possible crashes when initializing asyncio.Task or asyncio.Future multiple times. These classes can now be initialized only once and any subsequent initialization attempt will raise a RuntimeError. Patch by Kumar Aditya. - gh-142517: The non-compat32 email policies now correctly handle refolding encoded words that contain bytes that can not be decoded in their specified character set. Previously this resulted in an encoding exception during folding. - gh-138122: The Tachyon profiler’s live TUI now integrates with the experimental _colorize theming system. Users can customize colors via _colorize.set_theme() (experimental API, subject to change). A LiveProfilerLight theme is provided for light terminal backgrounds. Patch by Pablo Galindo. - gh-142306: Improve errors for Element.remove. - gh-63016: Add a flags parameter to mmap.mmap.flush() to control synchronization behavior. - gh-139262: Some keystrokes can be swallowed in the new PyREPL on Windows, especially when used together with the ALT key. Fix by Chris Eibl. - gh-138897: Improved license/copyright/credits display in the REPL: now uses a pager. - gh-135852: Add _winapi.RegisterEventSource(), _winapi.DeregisterEventSource() and _winapi.ReportEvent(). Using these functions in NTEventLogHandler to replace pywin32. - gh-109263: Starting a process from spawn context in multiprocessing no longer sets the start method globally. - gh-132715: Skip writing objects during marshalling once a failure has occurred. - Documentation - gh-140806: Add documentation for enum.bin(). - Core and Builtins - gh-134584: Eliminate redundant refcounting from _CONTAINS_OP, _CONTAINS_OP_SET and _CONTAINS_OP_DICT. - gh-143604: Fix a reference counting issue in the JIT tracer where the current executor could be prematurely freed during tracing. - gh-143469: Enable LOAD_ATTR_MODULE specialization even if __getattr__() is defined in module. - gh-134584: Eliminate redundant refcounting from TO_BOOL_STR. - gh-143377: Fix a crash in _interpreters.capture_exception() when the exception is incorrectly formatted. Patch by Bénédikt Tran. - gh-139757: Add BINARY_OP_SUBSCR_USTR_INT to specialize reading an ASCII character from any string. Patch by Chris Eibl. - gh-141504: Factor out tracing and optimization heuristics into a single object. Patch by Donghee Na. - gh-142982: Specialize CALL_FUNCTION_EX for Python and non-Python callables. - gh-136924: The interactive help mode in the REPL no longer incorrectly syntax highlights text input as Python code. Contributed by Olga Matoula. - gh-139757: Fix unintended bytecode specialization for non-ascii string. Patch by Donghee Na, Ken Jin and Chris Eibl. - gh-143361: Add PY_VECTORCALL_ARGUMENTS_OFFSET to _Py_CallBuiltinClass_StackRefSteal to avoid redundant allocations - gh-131798: The JIT optimizer now understands more generator instructions. - gh-134584: Eliminate redundant refcounting from _LOAD_ATTR_SLOT. - gh-143189: Fix crash when inserting a non-str key into a split table dictionary when the key matches an existing key in the split table but has no corresponding value in the dict. - gh-143228: Fix use-after-free in perf trampoline when toggling profiling while threads are running or during interpreter finalization with daemon threads active. The fix uses reference counting to ensure trampolines are not freed while any code object could still reference them. Pach by Pablo Galindo - gh-142664: Fix a use-after-free crash in memoryview.__hash__ when the __hash__ method of the referenced object mutates that object or the view. Patch by Bénédikt Tran. - gh-142557: Fix a use-after-free crash in bytearray.__mod__ when the bytearray is mutated while formatting the %-style arguments. Patch by Bénédikt Tran. - gh-143195: Fix use-after-free crashes in bytearray.hex() and memoryview.hex() when the separator’s __len__() mutates the original object. Patch by Bénédikt Tran. - gh-143183: Fix a bug in the JIT when dealing with unsupported control-flow or operations. - gh-142975: Fix crash after unfreezing all objects tracked by the garbage collector on the free threaded build. - gh-143135: Set sys.flags.inspect to 1 when PYTHONINSPECT is 0. Previously, it was set to 0 in this case. - gh-143123: Protect the JIT against recursive tracing. - gh-143092: Fix a crash in the JIT when dealing with list.append(x) style code. - gh-143003: Fix an overflow of the shared empty buffer in bytearray.extend() when __length_hint__() returns 0 for non-empty iterator. - gh-143006: Fix a possible assertion error when comparing negative non-integer float and int with the same number of bits in the integer part. - gh-116738: Fix thread safety of contextvars.Context.run(). - gh-142829: Fix a use-after-free crash in contextvars.Context comparison when a custom __eq__ method modifies the context via set(). - gh-142863: Generate optimized bytecode when calling list or set with generator expression. - gh-41779: Allowed defining any __slots__ for a class derived from tuple (including classes created by collections.namedtuple()). - gh-69605: Fix edge-cases around already imported modules in the REPL auto-completion of imports. - gh-138568: Adjusted the built-in help() function so that empty inputs are ignored in interactive mode. - gh-131798: Remove bounds check when indexing into tuples with a constant index. - gh-134584: Eliminate redundant refcounting from _CALL_TYPE_1. Patch by Tomas Roun - gh-132108: Speed up int.from_bytes() when passed object supports buffer protocol, like bytearray by ~1.2x. - gh-128334: Make the slice class subscriptable at runtime to be consistent with typing implementation. - C API - gh-141671: PyMODINIT_FUNC (and the new PyMODEXPORT_FUNC) now adds a linkage declaration (__declspec(dllexport)) on Windows. Update to 3.15.0a4: - Tests - gh-142836: Accommodated Solaris in test_pdb.test_script_target_anonymous_pipe. - Library - gh-122431: Corrected the error message in readline.append_history_file() to state that nelements must be non-negative instead of positive. - gh-143046: The asyncio REPL no longer prints copyright and version messages in the quiet mode (-q). Patch by Bartosz Sławecki. - gh-80744: Fix issue where pdb would read a .pdbrc twice if launched from the home directory - gh-138122: Add blocking mode to Tachyon for accurate stack traces in applications with many generators or fast-changing call stacks. Patch by Pablo Galindo. - gh-143010: Fixed a bug in mailbox where the precise timing of an external event could result in the library opening an existing file instead of a file it expected to create. - gh-112127: Fix possible use-after-free in atexit.unregister() when the callback is unregistered during comparison. - gh-138122: Fix incomplete stack traces in the Tachyon profiler’s frame cache when profiling code with deeply nested generators. The frame cache now validates that stack traces reach the base frame before caching, preventing broken flamegraphs. Patch by Pablo Galindo. - gh-142834: Change the pdb commands command to use the last available breakpoint instead of failing when the most recently created breakpoint was deleted. - gh-142783: Fix zoneinfo use-after-free with descriptor _weak_cache. a descriptor as _weak_cache could cause crashes during object creation. The fix ensures proper reference counting for descriptor-provided objects. - gh-76007: Deprecate VERSION from xml.etree.ElementTree and version from xml.sax.expatreader and xml.sax.handler. Patch by Hugo van Kemenade. - gh-142784: The asyncio REPL now properly closes the loop upon the end of interactive session. Previously, it could cause surprising warnings. Contributed by Bartosz Sławecki. - gh-138122: Add binary output format to profiling.sampling for compact storage of profiling data. The new --binary option captures samples to a file that can be converted to other formats using the replay command. Patch by Pablo Galindo - 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-142654: Show the clearer error message when using profiling.sampling on an unknown PID. - gh-142560: Fix use-after-free in bytearray search-like methods (find(), count(), index(), rindex(), and rfind()) by marking the storage as exported which causes reallocation attempts to raise BufferError. For contains(), split(), and rsplit() the buffer protocol is used for this. - gh-142419: mmap.mmap.set_name() method added to annotate an anonymous memory map if Linux kernel supports PR_SET_VMA_ANON_NAME (Linux 5.17 or newer). Patch by Donghee Na. - gh-139971: pydoc: Ensure that the link to the online documentation of a stdlib module is correct. - gh-124098: Fix issue where methods in handlers that lacked the protocol name but matched a valid base handler method (e.g., _open() or error()) were incorrectly added to urllib.request.OpenerDirector’s handlers. Contributed by Andrea Mattei. - gh-136282: Add support for UNNAMED_SECTION when creating a section via the mapping protocol access - Core and Builtins - gh-143057: Avoid locking in PyTraceMalloc_Track() and PyTraceMalloc_Untrack() when tracemalloc is not enabled. - gh-139109: Add missing terminator in certain cases when tracing in the new JIT compiler. - gh-142961: Fix a segfault in the JIT when constant folding len(tuple). - gh-142776: Fix a file descriptor leak in import.c - gh-139757: Fix building JIT stencils on free-threaded builds. - gh-129068: Make concurrent iteration over the same range iterator thread-safe in the free threading build. - gh-142543: Fix a stack overflow on Clang JIT build configurations with full LTO. - gh-142448: Fix a bug when using monitoring with the JIT. - gh-142766: Clear the frame of a generator when generator.close() is called. - gh-134584: Eliminate redundant refcounting from _LOAD_ATTR_INSTANCE_VALUE. - gh-134584: Eliminate redundant refcounting from _STORE_ATTR_WITH_HINT. - gh-142476: Fix a memory leak in the experimental Tier 2 optimizer when creating executors. Patched by Shamil Abdulaev. - gh-100964: Fix reference cycle in exhausted generator frames. Patch by Savannah Ostrowski. - gh-139922: Allow building CPython with the tail calling interpreter on Visual Studio 2026 MSVC. This provides a performance gain over the prior interpreter for MSVC. Patch by Ken Jin, Brandt Bucher, and Chris Eibl. With help from the MSVC team including Hulon Jenkins. Remove upstreamed patch: - longer-time-test_thread_time.patch 2026-02-08 14:38:36 +01:00			`version https://git-lfs.github.com/spec/v1`
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