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diff --git a/Misc/NEWS.d/3.12.0a1.rst b/Misc/NEWS.d/3.12.0a1.rst new file mode 100644 index 00000000000..2a943fe481a --- /dev/null +++ b/Misc/NEWS.d/3.12.0a1.rst @@ -0,0 +1,6194 @@ +.. date: 2022-09-28-17-09-37 +.. gh-issue: 97616 +.. nonce: K1e3Xs +.. release date: 2022-10-25 +.. section: Security + +Fix multiplying a list by an integer (``list *= int``): detect the integer +overflow when the new allocated length is close to the maximum size. Issue +reported by Jordan Limor. Patch by Victor Stinner. + +.. + +.. date: 2022-09-07-10-42-00 +.. gh-issue: 97514 +.. nonce: Yggdsl +.. section: Security + +On Linux the :mod:`multiprocessing` module returns to using filesystem +backed unix domain sockets for communication with the *forkserver* process +instead of the Linux abstract socket namespace. Only code that chooses to +use the :ref:`"forkserver" start method <multiprocessing-start-methods>` is +affected. + +Abstract sockets have no permissions and could allow any user on the system +in the same `network namespace +<https://man7.org/linux/man-pages/man7/network_namespaces.7.html>`_ (often +the whole system) to inject code into the multiprocessing *forkserver* +process. This was a potential privilege escalation. Filesystem based socket +permissions restrict this to the *forkserver* process user as was the +default in Python 3.8 and earlier. + +This prevents Linux `CVE-2022-42919 +<https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-42919>`_. + +.. + +.. date: 2022-06-15-20-09-23 +.. gh-issue: 87389 +.. nonce: QVaC3f +.. section: Security + +:mod:`http.server`: Fix an open redirection vulnerability in the HTTP server +when an URI path starts with ``//``. Vulnerability discovered, and initial +fix proposed, by Hamza Avvan. + +.. + +.. date: 2022-06-03-12-52-53 +.. gh-issue: 79096 +.. nonce: YVoxgC +.. section: Security + +LWPCookieJar and MozillaCookieJar create files with file mode 600 instead of +644 (Microsoft Windows is not affected) + +.. + +.. date: 2022-05-19-08-53-07 +.. gh-issue: 92888 +.. nonce: TLtR9W +.. section: Security + +Fix ``memoryview`` use after free when accessing the backing buffer in +certain cases. + +.. + +.. date: 2022-04-27-18-25-30 +.. gh-issue: 68966 +.. nonce: gjS8zs +.. section: Security + +The deprecated mailcap module now refuses to inject unsafe text (filenames, +MIME types, parameters) into shell commands. Instead of using such text, it +will warn and act as if a match was not found (or for test commands, as if +the test failed). + +.. + +.. date: 2022-10-19-23-48-46 +.. gh-issue: 98374 +.. nonce: eOBh8M +.. section: Core and Builtins + +Suppress ImportError for invalid query for help() command. Patch by Dong-hee +Na. + +.. + +.. date: 2022-10-19-20-53-38 +.. gh-issue: 98461 +.. nonce: iNmPDV +.. section: Core and Builtins + +Fix source location in bytecode for list, set and dict comprehensions as +well as generator expressions. + +.. + +.. date: 2022-10-19-18-03-28 +.. gh-issue: 98354 +.. nonce: GRGta3 +.. section: Core and Builtins + +Added unicode check for ``name`` attribute of ``spec`` argument passed in +:func:`_imp.create_builtin` function. + +.. + +.. date: 2022-10-18-16-17-44 +.. gh-issue: 98398 +.. nonce: x4rYK_ +.. section: Core and Builtins + +Fix source location of 'assert' bytecodes. + +.. + +.. date: 2022-10-18-14-11-32 +.. gh-issue: 98390 +.. nonce: H1sxJu +.. section: Core and Builtins + +Fix location of sub-expressions of boolean expressions, by reducing their +scope to that of the sub-expression. + +.. + +.. date: 2022-10-13-23-23-01 +.. gh-issue: 98254 +.. nonce: bC8IKt +.. section: Core and Builtins + +Modules from the standard library are now potentially suggested as part of +the error messages displayed by the interpreter when an :exc:`NameError` is +raised to the top level. Patch by Pablo Galindo + +.. + +.. date: 2022-10-06-23-13-34 +.. gh-issue: 97997 +.. nonce: JQaJKF +.. section: Core and Builtins + +Add running column offset to the tokenizer state to avoid calculating AST +column information with pointer arithmetic. + +.. + +.. date: 2022-10-06-20-41-29 +.. gh-issue: 97973 +.. nonce: gB-xWi +.. section: Core and Builtins + +Modify the tokenizer to return all necessary information the parser needs to +set location information in the AST nodes, so that the parser does not have +to calculate those doing pointer arithmetic. + +.. + +.. date: 2022-10-06-15-45-57 +.. gh-issue: 96078 +.. nonce: fS-6mU +.. section: Core and Builtins + +:func:`os.sched_yield` now release the GIL while calling sched_yield(2). +Patch by Dong-hee Na. + +.. + +.. date: 2022-10-06-14-14-28 +.. gh-issue: 97955 +.. nonce: Nq5VXD +.. section: Core and Builtins + +Migrate :mod:`zoneinfo` to Argument Clinic. + +.. + +.. date: 2022-10-06-06-36-29 +.. gh-issue: 97912 +.. nonce: jGRJpa +.. section: Core and Builtins + +The compiler now avoids quadratic behavior when finding which instructions +should use the :opcode:`LOAD_FAST_CHECK` opcode. + +.. + +.. date: 2022-10-06-02-11-34 +.. gh-issue: 97002 +.. nonce: Zvsk71 +.. section: Core and Builtins + +Fix an issue where several frame objects could be backed by the same +interpreter frame, possibly leading to corrupted memory and hard crashes of +the interpreter. + +.. + +.. date: 2022-10-05-17-02-22 +.. gh-issue: 97943 +.. nonce: LYAWlE +.. section: Core and Builtins + +Bugfix: :func:`PyFunction_GetAnnotations` should return a borrowed +reference. It was returning a new reference. + +.. + +.. date: 2022-10-05-11-37-15 +.. gh-issue: 97922 +.. nonce: Zu9Bge +.. section: Core and Builtins + +The Garbage Collector now runs only on the eval breaker mechanism of the +Python bytecode evaluation loop instead on object allocations. The GC can +also run when :c:func:`PyErr_CheckSignals` is called so C extensions that +need to run for a long time without executing any Python code also have a +chance to execute the GC periodically. + +.. + +.. date: 2022-10-05-00-37-27 +.. gh-issue: 65961 +.. nonce: z0Ys0y +.. section: Core and Builtins + +When ``__package__`` is different than ``__spec__.parent``, raise a +``DeprecationWarning`` instead of ``ImportWarning``. + +Also remove ``importlib.util.set_package()`` which was scheduled for +removal. + +.. + +.. date: 2022-10-04-17-02-18 +.. gh-issue: 97850 +.. nonce: E3QTRA +.. section: Core and Builtins + +Long deprecated, ``module_repr()`` should now be completely eradicated. + +.. + +.. date: 2022-10-04-14-04-40 +.. gh-issue: 86298 +.. nonce: QVM7G1 +.. section: Core and Builtins + +In cases where ``warnings.warn_explicit()`` consults the module's loader, an +``DeprecationWarning`` is issued when ``m.__loader__`` differs from +``m.__spec__.loader``. + +.. + +.. date: 2022-10-04-02-00-10 +.. gh-issue: 97779 +.. nonce: f3N1hI +.. section: Core and Builtins + +Ensure that all Python frame objects are backed by "complete" frames. + +.. + +.. date: 2022-10-03-16-12-39 +.. gh-issue: 91052 +.. nonce: MsYL9d +.. section: Core and Builtins + +Add API for subscribing to modification events on selected dictionaries. + +.. + +.. date: 2022-10-03-13-35-48 +.. gh-issue: 97752 +.. nonce: 0xTjJY +.. section: Core and Builtins + +Fix possible data corruption or crashes when accessing the ``f_back`` member +of newly-created generator or coroutine frames. + +.. + +.. date: 2022-10-01-08-55-09 +.. gh-issue: 97591 +.. nonce: pw6kkH +.. section: Core and Builtins + +Fixed a missing incref/decref pair in ``Exception.__setstate__()``. Patch by +Ofey Chan. + +.. + +.. date: 2022-09-30-13-26-58 +.. gh-issue: 97670 +.. nonce: n61vMR +.. section: Core and Builtins + +Remove the :func:`sys.getdxp` function and the +``Tools/scripts/analyze_dxp.py`` script. DXP stands for "dynamic execution +pairs". They were related to ``DYNAMIC_EXECUTION_PROFILE`` and ``DXPAIRS`` +macros which have been removed in Python 3.11. Python can now be built with +:option:`./configure --enable-pystats <--enable-pystats>` to gather +statistics on Python opcodes. Patch by Victor Stinner. + +.. + +.. date: 2022-09-29-15-19-29 +.. gh-issue: 94526 +.. nonce: wq5m6T +.. section: Core and Builtins + +Fix the Python path configuration used to initialized :data:`sys.path` at +Python startup. Paths are no longer encoded to UTF-8/strict to avoid +encoding errors if it contains surrogate characters (bytes paths are decoded +with the surrogateescape error handler). Patch by Victor Stinner. + +.. + +.. date: 2022-09-27-11-59-13 +.. gh-issue: 96670 +.. nonce: XrBBit +.. section: Core and Builtins + +The parser now raises :exc:`SyntaxError` when parsing source code containing +null bytes. Patch by Pablo Galindo + +.. + +.. date: 2022-09-21-16-06-37 +.. gh-issue: 96975 +.. nonce: BmE0XY +.. section: Core and Builtins + +Fix a crash occurring when :c:func:`PyEval_GetFrame` is called while the +topmost Python frame is in a partially-initialized state. + +.. + +.. date: 2022-09-21-14-38-31 +.. gh-issue: 96848 +.. nonce: WuoLzU +.. section: Core and Builtins + +Fix command line parsing: reject :option:`-X int_max_str_digits <-X>` option +with no value (invalid) when the :envvar:`PYTHONINTMAXSTRDIGITS` environment +variable is set to a valid limit. Patch by Victor Stinner. + +.. + +.. date: 2022-09-20-11-06-45 +.. gh-issue: 95921 +.. nonce: dkcRQn +.. section: Core and Builtins + +Fix overly-broad source position information for chained comparisons used as +branching conditions. + +.. + +.. date: 2022-09-19-03-35-01 +.. gh-issue: 96821 +.. nonce: izK6JA +.. section: Core and Builtins + +Fix undefined behaviour in ``audioop.c``. + +.. + +.. date: 2022-09-18-08-47-40 +.. gh-issue: 96821 +.. nonce: Co2iOq +.. section: Core and Builtins + +Fix undefined behaviour in ``_testcapimodule.c``. + +.. + +.. date: 2022-09-16-19-02-40 +.. gh-issue: 95778 +.. nonce: cJmnst +.. section: Core and Builtins + +When :exc:`ValueError` is raised if an integer is larger than the limit, +mention the :func:`sys.set_int_max_str_digits` function in the error +message. Patch by Victor Stinner. + +.. + +.. date: 2022-09-16-16-54-35 +.. gh-issue: 96387 +.. nonce: GRzewg +.. section: Core and Builtins + +At Python exit, sometimes a thread holding the GIL can wait forever for a +thread (usually a daemon thread) which requested to drop the GIL, whereas +the thread already exited. To fix the race condition, the thread which +requested the GIL drop now resets its request before exiting. Issue +discovered and analyzed by Mingliang ZHAO. Patch by Victor Stinner. + +.. + +.. date: 2022-09-16-12-36-13 +.. gh-issue: 96864 +.. nonce: PLU3i8 +.. section: Core and Builtins + +Fix a possible assertion failure, fatal error, or :exc:`SystemError` if a +line tracing event raises an exception while opcode tracing is enabled. + +.. + +.. date: 2022-09-13-21-45-07 +.. gh-issue: 95778 +.. nonce: Oll4_5 +.. section: Core and Builtins + +The ``PyLong_FromString`` function was refactored to make it more +maintainable and extensible. + +.. + +.. date: 2022-09-13-12-06-46 +.. gh-issue: 96678 +.. nonce: NqGFyb +.. section: Core and Builtins + +Fix undefined behaviour in C code of null pointer arithmetic. + +.. + +.. date: 2022-09-12-16-58-22 +.. gh-issue: 96754 +.. nonce: 0GRme5 +.. section: Core and Builtins + +Make sure that all frame objects created are created from valid interpreter +frames. Prevents the possibility of invalid frames in backtraces and signal +handlers. + +.. + +.. date: 2022-09-12-15-15-04 +.. gh-issue: 90997 +.. nonce: sZO8c9 +.. section: Core and Builtins + +Improve the performance of reading and writing inline bytecode caches on +some platforms. + +.. + +.. date: 2022-09-11-12-43-43 +.. gh-issue: 96751 +.. nonce: anRT6a +.. section: Core and Builtins + +Remove dead code from ``CALL_FUNCTION_EX`` opcode. + +.. + +.. date: 2022-09-11-00-37-50 +.. gh-issue: 90751 +.. nonce: VE8-zf +.. section: Core and Builtins + +:class:`memoryview` now supports half-floats. Patch by Dong-hee Na and +Antoine Pitrou. + +.. + +.. date: 2022-09-09-13-13-27 +.. gh-issue: 96678 +.. nonce: vMxi9F +.. section: Core and Builtins + +Fix case of undefined behavior in ceval.c + +.. + +.. date: 2022-09-08-20-58-10 +.. gh-issue: 64373 +.. nonce: AfCi36 +.. section: Core and Builtins + +Convert :mod:`_functools` to argument clinic. + +.. + +.. date: 2022-09-07-13-38-37 +.. gh-issue: 96641 +.. nonce: wky0Fc +.. section: Core and Builtins + +Do not expose ``KeyWrapper`` in :mod:`_functools`. + +.. + +.. date: 2022-09-07-12-02-11 +.. gh-issue: 96636 +.. nonce: YvN-K6 +.. section: Core and Builtins + +Ensure that tracing, ``sys.setrace()``, is turned on immediately. In +pre-release versions of 3.11, some tracing events might have been lost when +turning on tracing in a ``__del__`` method or interrupt. + +.. + +.. date: 2022-09-06-16-54-49 +.. gh-issue: 96572 +.. nonce: 8DRsaW +.. section: Core and Builtins + +Fix use after free in trace refs build mode. Patch by Kumar Aditya. + +.. + +.. date: 2022-09-06-16-22-13 +.. gh-issue: 96611 +.. nonce: 14wIX8 +.. section: Core and Builtins + +When loading a file with invalid UTF-8 inside a multi-line string, a correct +SyntaxError is emitted. + +.. + +.. date: 2022-09-06-14-26-36 +.. gh-issue: 96612 +.. nonce: P4ZbeY +.. section: Core and Builtins + +Make sure that incomplete frames do not show up in tracemalloc traces. + +.. + +.. date: 2022-09-06-11-19-03 +.. gh-issue: 90230 +.. nonce: YOtzs5 +.. section: Core and Builtins + +Fix compiler warnings and test failures when building with +``--enable-pystats``. + +.. + +.. date: 2022-09-05-19-20-44 +.. gh-issue: 96587 +.. nonce: bVxhX2 +.. section: Core and Builtins + +Correctly raise ``SyntaxError`` on exception groups (:pep:`654`) on python +versions prior to 3.11 + +.. + +.. date: 2022-09-05-16-43-44 +.. gh-issue: 96569 +.. nonce: 9lmTCC +.. section: Core and Builtins + +Remove two cases of undefined behavoir, by adding NULL checks. + +.. + +.. date: 2022-09-05-15-07-25 +.. gh-issue: 96582 +.. nonce: HEsL5s +.. section: Core and Builtins + +Fix possible ``NULL`` pointer dereference in ``_PyThread_CurrentFrames``. +Patch by Kumar Aditya. + +.. + +.. date: 2022-09-05-09-56-32 +.. gh-issue: 91079 +.. nonce: H4-DdU +.. section: Core and Builtins + +Separate Python recursion checking from C recursion checking which reduces +the chance of C stack overflow and allows the recursion limit to be +increased safely. + +.. + +.. date: 2022-09-02-16-47-52 +.. gh-issue: 93911 +.. nonce: vF-GWe +.. section: Core and Builtins + +Fix an issue that could prevent :opcode:`LOAD_ATTR` from specializing +properly when accessing properties. + +.. + +.. date: 2022-08-31-18-46-13 +.. gh-issue: 96348 +.. nonce: xzCoTP +.. section: Core and Builtins + +Emit a DeprecationWarning when :meth:`~generator.throw`, +:meth:`~coroutine.throw` or :meth:`~agen.athrow` are called with more than +one argument. + +.. + +.. date: 2022-08-29-13-06-58 +.. gh-issue: 95196 +.. nonce: eGRR4b +.. section: Core and Builtins + +Disable incorrect pickling of the C implemented classmethod descriptors. + +.. + +.. date: 2022-08-29-00-37-21 +.. gh-issue: 96364 +.. nonce: c-IVyb +.. section: Core and Builtins + +Fix text signatures of ``list.__getitem__`` and ``dict.__getitem__``. + +.. + +.. date: 2022-08-28-10-51-19 +.. gh-issue: 96352 +.. nonce: jTLD2d +.. section: Core and Builtins + +Fix :exc:`AttributeError` missing ``name`` and ``obj`` attributes in +:meth:`object.__getattribute__`. Patch by Philip Georgi. + +.. + +.. date: 2022-08-26-18-46-32 +.. gh-issue: 93554 +.. nonce: QEaCcK +.. section: Core and Builtins + +Change the jump opcodes so that all conditional jumps are forward jumps. +Backward jumps are converted by the assembler into a conditional forward +jump whose target is the fallthrough block (and with a reversed condition), +followed by an unconditional backward jump. For example: + +``POP_JUMP_IF_TRUE BACKWARD_TARGET`` becomes ``POP_JUMP_IF_FALSE NEXT_BLOCK; +JUMP BACKWARD_TARGET``. + +All the directed conditional jump opcodes were removed: +``POP_JUMP_FORWARD_IF_TRUE``, ``POP_JUMP_BACKWARD_IF_TRUE``, +``POP_JUMP_FORWARD_IF_FALSE``, ``POP_JUMP_BACKWARD_IF_FALSE``, +``POP_JUMP_FORWARD_IF_NONE``, ``POP_JUMP_BACKWARD_IF_NONE``, +``POP_JUMP_FORWARD_IF_NOT_NONE``, ``POP_JUMP_BACKWARD_IF_NOT_NONE``. + +The corresponding opcodes without direction are no longer +pseudo-instructions, and they implement the forward conditional jumps. + +.. + +.. date: 2022-08-25-10-19-34 +.. gh-issue: 96268 +.. nonce: AbYrLB +.. section: Core and Builtins + +Loading a file with invalid UTF-8 will now report the broken character at +the correct location. + +.. + +.. date: 2022-08-24-14-30-26 +.. gh-issue: 96237 +.. nonce: msif5f +.. section: Core and Builtins + +The internal field ``_PyInterpreterFrame.f_func`` is renamed to +``_PyInterpreterFrame.f_funcobj`` and may be any object. The ``f_globals`` +and ``f_builtin`` fields may hold junk values. + +It is safest to treat the ``_PyInterpreterFrame`` struct as opaque. + +.. + +.. date: 2022-08-22-21-33-28 +.. gh-issue: 96187 +.. nonce: W_6SRG +.. section: Core and Builtins + +Fixed a bug that caused ``_PyCode_GetExtra`` to return garbage for negative +indexes. Patch by Pablo Galindo + +.. + +.. date: 2022-08-20-18-36-40 +.. gh-issue: 96143 +.. nonce: nh3GFM +.. section: Core and Builtins + +Add a new ``-X perf`` Python command line option as well as +:func:`sys.activate_stack_trampoline` and +:func:`sys.deactivate_stack_trampoline` function in the :mod:`sys` module +that allows to set/unset the interpreter in a way that the Linux ``perf`` +profiler can detect Python calls. The new +:func:`sys.is_stack_trampoline_active` function allows to query the state of +the perf trampoline. Design by Pablo Galindo. Patch by Pablo Galindo and +Christian Heimes with contributions from Gregory P. Smith [Google] and Mark +Shannon. + +.. + +.. date: 2022-08-19-06-51-17 +.. gh-issue: 96071 +.. nonce: mVgPAo +.. section: Core and Builtins + +Fix a deadlock in :c:func:`PyGILState_Ensure` when allocating new thread +state. Patch by Kumar Aditya. + +.. + +.. date: 2022-08-18-13-47-59 +.. gh-issue: 96046 +.. nonce: 5Hqbka +.. section: Core and Builtins + +:c:func:`PyType_Ready` now initializes ``ht_cached_keys`` and performs +additional checks to ensure that type objects are properly configured. This +avoids crashes in 3rd party packages that don't use regular API to create +new types. + +.. + +.. date: 2022-08-15-21-08-11 +.. gh-issue: 96005 +.. nonce: 6eoc8k +.. section: Core and Builtins + +On WASI :data:`~errno.ENOTCAPABLE` is now mapped to :exc:`PermissionError`. +The :mod:`errno` modules exposes the new error number. ``getpath.py`` now +ignores :exc:`PermissionError` when it cannot open landmark files +``pybuilddir.txt`` and ``pyenv.cfg``. + +.. + +.. date: 2022-08-15-20-52-41 +.. gh-issue: 93678 +.. nonce: X7GuIJ +.. section: Core and Builtins + +Added test a harness for direct unit tests of the compiler's optimization +stage. The ``_testinternalcapi.optimize_cfg()`` function runs the optimiser +on a sequence of instructions. The ``CfgOptimizationTestCase`` class in +``test.support`` has utilities for invoking the optimizer and checking the +output. + +.. + +.. date: 2022-08-15-12-41-14 +.. gh-issue: 95245 +.. nonce: N4gOUV +.. section: Core and Builtins + +Reduces the size of a "simple" Python object from 8 to 6 words by moving the +weakreflist pointer into the pre-header directly before the object's +dict/values pointer. + +.. + +.. date: 2022-08-15-11-58-05 +.. gh-issue: 90997 +.. nonce: bWwV8Q +.. section: Core and Builtins + +Compile virtual :keyword:`try`/:keyword:`except` blocks to handle exceptions +raised during :meth:`~generator.close` or :meth:`~generator.throw` calls +through a suspended frame. + +.. + +.. date: 2022-08-14-10-04-44 +.. gh-issue: 95977 +.. nonce: gCTZb9 +.. section: Core and Builtins + +Optimized calling :meth:`~object.__get__` with vectorcall. Patch by Kumar +Aditya. + +.. + +.. date: 2022-08-12-18-13-49 +.. gh-issue: 91210 +.. nonce: AWMSLj +.. section: Core and Builtins + +Improve error message when a parameter without a default value follows one +with a default value, and show the same message, even when the +non-default/default sequence is preceded by positional-only parameters. + +.. + +.. date: 2022-08-12-13-04-25 +.. gh-issue: 95922 +.. nonce: YNCtyX +.. section: Core and Builtins + +Fixed bug where the compiler's ``eliminate_empty_basic_blocks`` function +ignores the last block of the code unit. + +.. + +.. date: 2022-08-11-11-01-56 +.. gh-issue: 95818 +.. nonce: iClLdl +.. section: Core and Builtins + +Skip over incomplete frames in :c:func:`PyThreadState_GetFrame`. + +.. + +.. date: 2022-08-11-09-19-55 +.. gh-issue: 95876 +.. nonce: YpQfoV +.. section: Core and Builtins + +Fix format string in ``_PyPegen_raise_error_known_location`` that can lead +to memory corruption on some 64bit systems. The function was building a +tuple with ``i`` (int) instead of ``n`` (Py_ssize_t) for Py_ssize_t +arguments. + +.. + +.. date: 2022-08-04-18-46-54 +.. gh-issue: 95605 +.. nonce: FbpCoG +.. section: Core and Builtins + +Fix misleading contents of error message when converting an all-whitespace +string to :class:`float`. + +.. + +.. date: 2022-07-31-13-23-12 +.. gh-issue: 95150 +.. nonce: 67FXVo +.. section: Core and Builtins + +Update code object hashing and equality to consider all debugging and +exception handling tables. This fixes an issue where certain non-identical +code objects could be "deduplicated" during compilation. + +.. + +.. date: 2022-07-31-03-22-58 +.. gh-issue: 91146 +.. nonce: Y2Hziy +.. section: Core and Builtins + +Reduce allocation size of :class:`list` from :meth:`str.split` and +:meth:`str.rsplit`. Patch by Dong-hee Na and Inada Naoki. + +.. + +.. date: 2022-07-28-19-07-06 +.. gh-issue: 87092 +.. nonce: 73IPS1 +.. section: Core and Builtins + +Create a 'jump target label' abstraction in the compiler so that the +compiler's codegen stage does not work directly with basic blocks. This +prepares the code for changes to the underlying CFG generation mechanism. + +.. + +.. date: 2022-07-28-08-33-31 +.. gh-issue: 95355 +.. nonce: yN4XVk +.. section: Core and Builtins + +``_PyPegen_Parser_New`` now properly detects token memory allocation errors. +Patch by Honglin Zhu. + +.. + +.. date: 2022-07-27-14-21-57 +.. gh-issue: 90081 +.. nonce: HVAS5x +.. section: Core and Builtins + +Run Python code in tracer/profiler function at full speed. Fixes slowdown in +earlier versions of 3.11. + +.. + +.. date: 2022-07-27-14-05-07 +.. gh-issue: 95324 +.. nonce: 28Q5u7 +.. section: Core and Builtins + +Emit a warning in debug mode if an object does not call +:c:func:`PyObject_GC_UnTrack` before deallocation. Patch by Pablo Galindo. + +.. + +.. date: 2022-07-26-12-59-03 +.. gh-issue: 95245 +.. nonce: GHWczn +.. section: Core and Builtins + +Merge managed dict and values pointer into a single tagged pointer to save +one word in the pre-header. + +.. + +.. date: 2022-07-26-09-31-12 +.. gh-issue: 93678 +.. nonce: W8vvgT +.. section: Core and Builtins + +Add cfg_builder struct and refactor the relevant code so that a cfg can be +constructed without an instance of the compiler struct. + +.. + +.. date: 2022-07-24-00-27-47 +.. gh-issue: 95185 +.. nonce: ghYTZx +.. section: Core and Builtins + +Prevented crashes in the AST constructor when compiling some absurdly long +expressions like ``"+0"*1000000``. :exc:`RecursionError` is now raised +instead. Patch by Pablo Galindo + +.. + +.. date: 2022-07-23-19-16-25 +.. gh-issue: 93351 +.. nonce: 0Jyvu- +.. section: Core and Builtins + +:class:`ast.AST` node positions are now validated when provided to +:func:`compile` and other related functions. If invalid positions are +detected, a :exc:`ValueError` will be raised. + +.. + +.. date: 2022-07-22-12-53-34 +.. gh-issue: 94438 +.. nonce: hNqACc +.. section: Core and Builtins + +Fix an issue that caused extended opcode arguments and some conditional pops +to be ignored when calculating valid jump targets for assignments to the +``f_lineno`` attribute of frame objects. In some cases, this could cause +inconsistent internal state, resulting in a hard crash of the interpreter. + +.. + +.. date: 2022-07-21-19-19-20 +.. gh-issue: 95060 +.. nonce: 4xdT1f +.. section: Core and Builtins + +Undocumented ``PyCode_Addr2Location`` function now properly returns when +``addrq`` argument is less than zero. + +.. + +.. date: 2022-07-21-17-54-52 +.. gh-issue: 95113 +.. nonce: NnSLpT +.. section: Core and Builtins + +Replace all ``EXTENDED_ARG_QUICK`` instructions with basic +:opcode:`EXTENDED_ARG` instructions in unquickened code. Consumers of +non-adaptive bytecode should be able to handle extended arguments the same +way they were handled in CPython 3.10 and older. + +.. + +.. date: 2022-07-20-13-46-01 +.. gh-issue: 91409 +.. nonce: dhL8Zo +.. section: Core and Builtins + +Fix incorrect source location info caused by certain optimizations in the +bytecode compiler. + +.. + +.. date: 2022-07-20-09-04-55 +.. gh-issue: 95023 +.. nonce: bs-xd7 +.. section: Core and Builtins + +Implement :func:`os.setns` and :func:`os.unshare` for Linux. Patch by Noam +Cohen. + +.. + +.. date: 2022-07-19-16-30-59 +.. gh-issue: 94036 +.. nonce: _6Utkm +.. section: Core and Builtins + +Fix incorrect source location info for some multi-line attribute accesses +and method calls. + +.. + +.. date: 2022-07-19-09-41-55 +.. gh-issue: 94938 +.. nonce: xYBlM7 +.. section: Core and Builtins + +Fix error detection in some builtin functions when keyword argument name is +an instance of a str subclass with overloaded ``__eq__`` and ``__hash__``. +Previously it could cause SystemError or other undesired behavior. + +.. + +.. date: 2022-07-19-04-34-56 +.. gh-issue: 94996 +.. nonce: dV564A +.. section: Core and Builtins + +:func:`ast.parse` will no longer parse function definitions with +positional-only params when passed ``feature_version`` less than ``(3, 8)``. +Patch by Shantanu Jain. + +.. + +.. date: 2022-07-18-14-19-21 +.. gh-issue: 94739 +.. nonce: NQJQi7 +.. section: Core and Builtins + +Allow jumping within, out of, and across exception handlers in the debugger. + +.. + +.. date: 2022-07-18-05-10-29 +.. gh-issue: 94949 +.. nonce: OsZ7_s +.. section: Core and Builtins + +:func:`ast.parse` will no longer parse parenthesized context managers when +passed ``feature_version`` less than ``(3, 9)``. Patch by Shantanu Jain. + +.. + +.. date: 2022-07-18-04-48-34 +.. gh-issue: 94947 +.. nonce: df9gUw +.. section: Core and Builtins + +:func:`ast.parse` will no longer parse assignment expressions when passed +``feature_version`` less than ``(3, 8)``. Patch by Shantanu Jain. + +.. + +.. date: 2022-07-17-15-54-29 +.. gh-issue: 91256 +.. nonce: z7i7Q5 +.. section: Core and Builtins + +Ensures the program name is known for help text during interpreter startup. + +.. + +.. date: 2022-07-16-08-14-17 +.. gh-issue: 94869 +.. nonce: eRwMsX +.. section: Core and Builtins + +Fix the column offsets for some expressions in multi-line f-strings +:mod:`ast` nodes. Patch by Pablo Galindo. + +.. + +.. date: 2022-07-15-22-47-44 +.. gh-issue: 94893 +.. nonce: YiJYcW +.. section: Core and Builtins + +Fix an issue where frame object manipulations could corrupt inline bytecode +caches. + +.. + +.. date: 2022-07-15-22-16-08 +.. gh-issue: 94822 +.. nonce: zRRzBN +.. section: Core and Builtins + +Fix an issue where lookups of metaclass descriptors may be ignored when an +identically-named attribute also exists on the class itself. + +.. + +.. date: 2022-07-15-16-15-04 +.. gh-issue: 91153 +.. nonce: HiBmtt +.. section: Core and Builtins + +Fix an issue where a :class:`bytearray` item assignment could crash if it's +resized by the new value's :meth:`__index__` method. + +.. + +.. date: 2022-07-14-10-07-53 +.. gh-issue: 90699 +.. nonce: x3aG9m +.. section: Core and Builtins + +Fix reference counting bug in :meth:`bool.__repr__`. Patch by Kumar Aditya. + +.. + +.. date: 2022-07-08-16-44-11 +.. gh-issue: 94694 +.. nonce: VkL2CM +.. section: Core and Builtins + +Fix an issue that could cause code with multi-line method lookups to have +misleading or incorrect column offset information. In some cases (when +compiling a hand-built AST) this could have resulted in a hard crash of the +interpreter. + +.. + +.. date: 2022-07-08-11-44-45 +.. gh-issue: 93252 +.. nonce: i2358c +.. section: Core and Builtins + +Fix an issue that caused internal frames to outlive failed Python function +calls, possibly resulting in memory leaks or hard interpreter crashes. + +.. + +.. date: 2022-07-07-21-13-25 +.. gh-issue: 94215 +.. nonce: _Sv9Ms +.. section: Core and Builtins + +Fix an issue where exceptions raised by line-tracing events would cause +frames to be left in an invalid state, possibly resulting in a hard crash of +the interpreter. + +.. + +.. date: 2022-07-06-14-02-26 +.. gh-issue: 92228 +.. nonce: 44Cbly +.. section: Core and Builtins + +Disable the compiler's inline-small-exit-blocks optimization for exit blocks +that are associated with source code lines. This fixes a bug where the +debugger cannot tell where an exception handler ends and the following code +block begins. + +.. + +.. date: 2022-07-01-20-00-19 +.. gh-issue: 94485 +.. nonce: mo5st7 +.. section: Core and Builtins + +Line number of a module's ``RESUME`` instruction is set to 0 as specified in +:pep:`626`. + +.. + +.. date: 2022-06-30-15-07-26 +.. gh-issue: 94438 +.. nonce: btzHSk +.. section: Core and Builtins + +Account for instructions that can push NULL to the stack when setting line +number in a frame. Prevents some (unlikely) crashes. + +.. + +.. date: 2022-06-29-22-18-36 +.. gh-issue: 91719 +.. nonce: 3APYYI +.. section: Core and Builtins + +Reload ``opcode`` when raising ``unknown opcode error`` in the interpreter +main loop, for C compilers to generate dispatching code independently. + +.. + +.. date: 2022-06-29-15-45-04 +.. gh-issue: 94329 +.. nonce: olUQyk +.. section: Core and Builtins + +Compile and run code with unpacking of extremely large sequences (1000s of +elements). Such code failed to compile. It now compiles and runs correctly. + +.. + +.. date: 2022-06-28-14-20-36 +.. gh-issue: 94360 +.. nonce: DiEnen +.. section: Core and Builtins + +Fixed a tokenizer crash when reading encoded files with syntax errors from +``stdin`` with non utf-8 encoded text. Patch by Pablo Galindo + +.. + +.. date: 2022-06-28-12-41-17 +.. gh-issue: 88116 +.. nonce: A7fEl_ +.. section: Core and Builtins + +Fix an issue when reading line numbers from code objects if the encoded line +numbers are close to ``INT_MIN``. Patch by Pablo Galindo + +.. + +.. date: 2022-06-28-10-08-06 +.. gh-issue: 94262 +.. nonce: m-HWUZ +.. section: Core and Builtins + +Don't create frame objects for incomplete frames. Prevents the creation of +generators and closures from being observable to Python and C extensions, +restoring the behavior of 3.10 and earlier. + +.. + +.. date: 2022-06-26-14-37-03 +.. gh-issue: 94192 +.. nonce: ab7tn7 +.. section: Core and Builtins + +Fix error for dictionary literals with invalid expression as value. + +.. + +.. date: 2022-06-25-10-19-43 +.. gh-issue: 87995 +.. nonce: aMDHnp +.. section: Core and Builtins + +:class:`types.MappingProxyType` instances are now hashable if the underlying +mapping is hashable. + +.. + +.. date: 2022-06-24-14-06-20 +.. gh-issue: 93883 +.. nonce: 8jVQQ4 +.. section: Core and Builtins + +Revise the display strategy of traceback enhanced error locations. The +indicators are only shown when the location doesn't span the whole line. + +.. + +.. date: 2022-06-23-12-10-39 +.. gh-issue: 94163 +.. nonce: SqAfQq +.. section: Core and Builtins + +Add :opcode:`BINARY_SLICE` and :opcode:`STORE_SLICE` instructions for more +efficient handling and better specialization of slicing operations, where +the slice is explicit in the source code. + +.. + +.. date: 2022-06-20-13-48-57 +.. gh-issue: 94021 +.. nonce: o78q3G +.. section: Core and Builtins + +Fix unreachable code warning in ``Python/specialize.c``. + +.. + +.. date: 2022-06-18-17-00-33 +.. gh-issue: 93911 +.. nonce: y286of +.. section: Core and Builtins + +Specialize ``LOAD_ATTR`` for objects with custom ``__getattribute__``. + +.. + +.. date: 2022-06-17-16-30-24 +.. gh-issue: 93955 +.. nonce: LmiAe9 +.. section: Core and Builtins + +Improve performance of attribute lookups on objects with custom +``__getattribute__`` and ``__getattr__``. Patch by Ken Jin. + +.. + +.. date: 2022-06-16-16-53-22 +.. gh-issue: 93911 +.. nonce: RDwIiK +.. section: Core and Builtins + +Specialize ``LOAD_ATTR`` for ``property()`` attributes. + +.. + +.. date: 2022-06-15-16-45-53 +.. gh-issue: 93678 +.. nonce: 1I_ZT3 +.. section: Core and Builtins + +Refactor compiler optimisation code so that it no longer needs the ``struct +assembler`` and ``struct compiler`` passed around. Instead, each function +takes the CFG and other data that it actually needs. This will make it +possible to test this code directly. + +.. + +.. date: 2022-06-15-11-16-13 +.. gh-issue: 93841 +.. nonce: 06zqX3 +.. section: Core and Builtins + +When built with ``-enable-pystats``, ``sys._stats_on()``, +``sys._stats_off()``, ``sys._stats_clear()`` and ``sys._stats_dump()`` +functions have been added to enable gathering stats for parts of programs. + +.. + +.. date: 2022-06-13-13-55-34 +.. gh-issue: 93516 +.. nonce: HILrDl +.. section: Core and Builtins + +Store offset of first traceable instruction in code object to avoid having +to recompute it for each instruction when tracing. + +.. + +.. date: 2022-06-13-10-48-09 +.. gh-issue: 93516 +.. nonce: yJSait +.. section: Core and Builtins + +Lazily create a table mapping bytecode offsets to line numbers to speed up +calculation of line numbers when tracing. + +.. + +.. date: 2022-06-12-19-31-56 +.. gh-issue: 89828 +.. nonce: bq02M7 +.. section: Core and Builtins + +:class:`types.GenericAlias` no longer relays the ``__class__`` attribute. +For example, ``isinstance(list[int], type)`` no longer returns ``True``. + +.. + +.. date: 2022-06-10-16-57-35 +.. gh-issue: 93678 +.. nonce: 1WBnHt +.. section: Core and Builtins + +Refactor the compiler to reduce boilerplate and repetition. + +.. + +.. date: 2022-06-10-12-03-17 +.. gh-issue: 93671 +.. nonce: idkQqG +.. section: Core and Builtins + +Fix some exponential backtrace case happening with deeply nested sequence +patterns in match statements. Patch by Pablo Galindo + +.. + +.. date: 2022-06-10-10-31-18 +.. gh-issue: 93662 +.. nonce: -7RSC1 +.. section: Core and Builtins + +Make sure that the end column offsets are correct in multi-line method +calls. Previously, the end column could precede the column offset. + +.. + +.. date: 2022-06-09-19-19-02 +.. gh-issue: 93461 +.. nonce: 5DqP1e +.. section: Core and Builtins + +:func:`importlib.invalidate_caches` now drops entries from +:data:`sys.path_importer_cache` with a relative path as name. This solves a +caching issue when a process changes its current working directory. + +``FileFinder`` no longer inserts a dot in the path, e.g. ``/egg/./spam`` is +now ``/egg/spam``. + +.. + +.. date: 2022-06-09-09-08-29 +.. gh-issue: 93621 +.. nonce: -_Pn1d +.. section: Core and Builtins + +Change order of bytecode instructions emitted for :keyword:`with` and +:keyword:`async with` to reduce the number of entries in the exception +table. + +.. + +.. date: 2022-06-06-14-28-24 +.. gh-issue: 93533 +.. nonce: lnC0CC +.. section: Core and Builtins + +Reduce the size of the inline cache for ``LOAD_METHOD`` by 2 bytes. + +.. + +.. date: 2022-06-02-23-00-08 +.. gh-issue: 93444 +.. nonce: m63DIs +.. section: Core and Builtins + +Removed redundant fields from the compiler's basicblock struct: +``b_nofallthrough``, ``b_exit``, ``b_return``. They can be easily calculated +from the opcode of the last instruction of the block. + +.. + +.. date: 2022-06-02-08-28-55 +.. gh-issue: 93429 +.. nonce: DZTWHx +.. section: Core and Builtins + +``LOAD_METHOD`` instruction has been removed. It was merged back into +``LOAD_ATTR``. + +.. + +.. date: 2022-06-01-17-47-40 +.. gh-issue: 93418 +.. nonce: 24dJuc +.. section: Core and Builtins + +Fixed an assert where an f-string has an equal sign '=' following an +expression, but there's no trailing brace. For example, f"{i=". + +.. + +.. date: 2022-05-31-16-36-30 +.. gh-issue: 93382 +.. nonce: Jf6gAj +.. section: Core and Builtins + +Cache the result of :c:func:`PyCode_GetCode` function to restore the O(1) +lookup of the :attr:`~types.CodeType.co_code` attribute. + +.. + +.. date: 2022-05-30-19-00-38 +.. gh-issue: 93359 +.. nonce: zXV3A0 +.. section: Core and Builtins + +Ensure that custom :mod:`ast` nodes without explicit end positions can be +compiled. Patch by Pablo Galindo. + +.. + +.. date: 2022-05-30-15-51-11 +.. gh-issue: 93356 +.. nonce: l5wnzW +.. section: Core and Builtins + +Code for exception handlers is emitted at the end of the code unit's +bytecode. This avoids one jump when no exception is raised. + +.. + +.. date: 2022-05-30-15-35-42 +.. gh-issue: 93354 +.. nonce: RZk8gs +.. section: Core and Builtins + +Use exponential backoff for specialization counters in the interpreter. Can +reduce the number of failed specializations significantly and avoid slowdown +for those parts of a program that are not suitable for specialization. + +.. + +.. date: 2022-05-30-14-50-03 +.. gh-issue: 93283 +.. nonce: XDO2ZQ +.. section: Core and Builtins + +Improve error message for invalid syntax of conversion character in f-string +expressions. + +.. + +.. date: 2022-05-30-10-22-46 +.. gh-issue: 93345 +.. nonce: gi1A4L +.. section: Core and Builtins + +Fix a crash in substitution of a ``TypeVar`` in nested generic alias after +``TypeVarTuple``. + +.. + +.. date: 2022-05-25-21-56-25 +.. gh-issue: 93223 +.. nonce: gTOGVZ +.. section: Core and Builtins + +When a bytecode instruction jumps to an unconditional jump instruction, the +first instruction can often be optimized to target the unconditional jump's +target directly. For tracing reasons, this would previously only occur if +both instructions have the same line number. This also now occurs if the +unconditional jump is artificial, i.e., if it has no associated line number. + +.. + +.. date: 2022-05-25-12-30-12 +.. gh-issue: 84694 +.. nonce: 5sjy2w +.. section: Core and Builtins + +The ``--experimental-isolated-subinterpreters`` configure option and +``EXPERIMENTAL_ISOLATED_SUBINTERPRETERS`` macro have been removed. + +.. + +.. date: 2022-05-25-04-07-22 +.. gh-issue: 91924 +.. nonce: -UyO4q +.. section: Core and Builtins + +Fix ``__lltrace__`` debug feature if the stdout encoding is not UTF-8. Patch +by Victor Stinner. + +.. + +.. date: 2022-05-24-14-35-48 +.. gh-issue: 93040 +.. nonce: 9X6Ofu +.. section: Core and Builtins + +Wraps unused parameters in ``Objects/obmalloc.c`` with ``Py_UNUSED``. + +.. + +.. date: 2022-05-23-18-36-07 +.. gh-issue: 93143 +.. nonce: X1Yqxm +.. section: Core and Builtins + +Avoid ``NULL`` checks for uninitialized local variables by determining at +compile time which variables must be initialized. + +.. + +.. date: 2022-05-22-02-37-50 +.. gh-issue: 93061 +.. nonce: r70Imp +.. section: Core and Builtins + +Backward jumps after ``async for`` loops are no longer given dubious line +numbers. + +.. + +.. date: 2022-05-21-23-21-37 +.. gh-issue: 93065 +.. nonce: 5I18WC +.. section: Core and Builtins + +Fix contextvars HAMT implementation to handle iteration over deep trees. + +The bug was discovered and fixed by Eli Libman. See +`MagicStack/immutables#84 +<https://github.com/MagicStack/immutables/issues/84>`_ for more details. + +.. + +.. date: 2022-05-20-13-32-24 +.. gh-issue: 93012 +.. nonce: e9B-pv +.. section: Core and Builtins + +Added the new function :c:func:`PyType_FromMetaclass`, which generalizes the +existing :c:func:`PyType_FromModuleAndSpec` using an additional metaclass +argument. This is useful for language binding tools, where it can be used to +intercept type-related operations like subclassing or static attribute +access by specifying a metaclass with custom slots. + +Importantly, :c:func:`PyType_FromMetaclass` is available in the Limited API, +which provides a path towards migrating more binding tools onto the Stable +ABI. + +.. + +.. date: 2022-05-20-09-25-34 +.. gh-issue: 93021 +.. nonce: k3Aji2 +.. section: Core and Builtins + +Fix the :attr:`__text_signature__` for :meth:`__get__` methods implemented +in C. Patch by Jelle Zijlstra. + +.. + +.. date: 2022-05-19-15-29-53 +.. gh-issue: 89914 +.. nonce: 8bAffH +.. section: Core and Builtins + +The operand of the ``YIELD_VALUE`` instruction is set to the stack depth. +This is done to help frame handling on ``yield`` and may assist debuggers. + +.. + +.. date: 2022-05-19-13-25-50 +.. gh-issue: 92955 +.. nonce: kmNV33 +.. section: Core and Builtins + +Fix memory leak in code object's lines and positions iterators as they were +not finalized at exit. Patch by Kumar Aditya. + +.. + +.. date: 2022-05-18-18-34-45 +.. gh-issue: 92930 +.. nonce: kpYPOb +.. section: Core and Builtins + +Fixed a crash in ``_pickle.c`` from mutating collections during +``__reduce__`` or ``persistent_id``. + +.. + +.. date: 2022-05-18-12-55-35 +.. gh-issue: 90690 +.. nonce: TKuoTa +.. section: Core and Builtins + +The PRECALL instruction has been removed. It offered only a small advantage +for specialization and is not needed in the vast majority of cases. + +.. + +.. date: 2022-05-18-08-32-33 +.. gh-issue: 92914 +.. nonce: tJUeTD +.. section: Core and Builtins + +Always round the allocated size for lists up to the nearest even number. + +.. + +.. date: 2022-05-17-20-41-43 +.. gh-issue: 92858 +.. nonce: eIXJTn +.. section: Core and Builtins + +Improve error message for some suites with syntax error before ':' + +.. + +.. date: 2022-05-15-15-25-05 +.. gh-issue: 90473 +.. nonce: MoPHYW +.. section: Core and Builtins + +Decrease default recursion limit on WASI to address limited call stack size. + +.. + +.. date: 2022-05-14-13-22-11 +.. gh-issue: 92804 +.. nonce: rAqpI2 +.. section: Core and Builtins + +Fix memory leak in ``memoryview`` iterator as it was not finalized at exit. +Patch by Kumar Aditya. + +.. + +.. date: 2022-05-13-12-36-10 +.. gh-issue: 92777 +.. nonce: Odo4vP +.. section: Core and Builtins + +Specialize ``LOAD_METHOD`` for objects with lazy dictionaries. Patch by Ken +Jin. + +.. + +.. date: 2022-05-13-00-57-18 +.. gh-issue: 92658 +.. nonce: YdhFE2 +.. section: Core and Builtins + +Add support for connecting and binding to Hyper-V sockets on Windows Hyper-V +hosts and guests. + +.. + +.. date: 2022-05-12-13-23-19 +.. gh-issue: 92236 +.. nonce: sDRzUe +.. section: Core and Builtins + +Remove spurious "LINE" event when starting a generator or coroutine, visible +tracing functions implemented in C. + +.. + +.. date: 2022-05-11-09-16-54 +.. gh-issue: 91102 +.. nonce: lenv9h +.. section: Core and Builtins + +:meth:`_warnings.warn_explicit` is ported to Argument Clinic. + +.. + +.. date: 2022-05-10-11-34-35 +.. gh-issue: 92619 +.. nonce: u0V0lY +.. section: Core and Builtins + +Make the compiler duplicate an exit block only if none of its instructions +have a lineno (previously only the first instruction in the block was +checked, leading to unnecessarily duplicated blocks). + +.. + +.. date: 2022-05-08-19-43-31 +.. gh-issue: 88750 +.. nonce: 1BjJg- +.. section: Core and Builtins + +The deprecated debug build only ``PYTHONTHREADDEBUG`` environment variable +no longer does anything. + +.. + +.. date: 2022-05-03-20-12-18 +.. gh-issue: 92261 +.. nonce: aigLnb +.. section: Core and Builtins + +Fix hang when trying to iterate over a ``typing.Union``. + +.. + +.. date: 2022-04-24-02-22-10 +.. gh-issue: 91432 +.. nonce: YPJAK6 +.. section: Core and Builtins + +Specialized the :opcode:`FOR_ITER` opcode using the PEP 659 machinery + +.. + +.. date: 2022-04-16-15-37-55 +.. gh-issue: 91399 +.. nonce: trLbK6 +.. section: Core and Builtins + +Removed duplicate '{0, 0, 0, 0, 0, 0}' entry in 'Objects/unicodetype_db.h'. + +.. + +.. date: 2022-04-15-22-12-53 +.. gh-issue: 91578 +.. nonce: rDOtyK +.. section: Core and Builtins + +Updates the error message for abstract class. + +.. + +.. bpo: 47091 +.. date: 2022-03-22-13-12-27 +.. nonce: tJcy-P +.. section: Core and Builtins + +Improve performance of repetition of :class:`list` and :class:`tuple` by +using ``memcpy`` to copy data and performing the reference increments in one +step. + +.. + +.. bpo: 46142 +.. date: 2022-01-02-14-53-59 +.. nonce: WayjgT +.. section: Core and Builtins + +Make ``--help`` output shorter by moving some info to the new ``--help-env`` +and ``--help-xoptions`` command-line options. Also add ``--help-all`` option +to print complete usage. + +.. + +.. bpo: 42316 +.. date: 2020-11-15-02-08-43 +.. nonce: LqdkWK +.. section: Core and Builtins + +Document some places where an assignment expression needs parentheses. + +.. + +.. date: 2022-10-23-18-30-39 +.. gh-issue: 89237 +.. nonce: kBui30 +.. section: Library + +Fix hang on Windows in ``subprocess.wait_closed()`` in :mod:`asyncio` with +:class:`~asyncio.ProactorEventLoop`. Patch by Kumar Aditya. + +.. + +.. date: 2022-10-19-09-29-12 +.. gh-issue: 97928 +.. nonce: xj3im7 +.. section: Library + +:meth:`tkinter.Text.count` raises now an exception for options starting with +"-" instead of silently ignoring them. + +.. + +.. date: 2022-10-18-15-41-37 +.. gh-issue: 98393 +.. nonce: vhPu4L +.. section: Library + +The :mod:`os` module no longer accepts bytes-like paths, like +:class:`bytearray` and :class:`memoryview` types: only the exact +:class:`bytes` type is accepted for bytes strings. Patch by Victor Stinner. + +.. + +.. date: 2022-10-17-12-49-02 +.. gh-issue: 98363 +.. nonce: aFmSP- +.. section: Library + +Added itertools.batched() to batch data into lists of a given length with +the last list possibly being shorter than the others. + +.. + +.. date: 2022-10-16-15-31-50 +.. gh-issue: 98331 +.. nonce: Y5kPOX +.. section: Library + +Update the bundled copies of pip and setuptools to versions 22.3 and 65.5.0 +respectively. + +.. + +.. date: 2022-10-16-06-18-59 +.. gh-issue: 98307 +.. nonce: b2_CDu +.. section: Library + +A :meth:`~logging.handlers.SysLogHandler.createSocket` method was added to +:class:`~logging.handlers.SysLogHandler`. + +.. + +.. date: 2022-10-14-19-57-37 +.. gh-issue: 96035 +.. nonce: 0xcX-p +.. section: Library + +Fix bug in :func:`urllib.parse.urlparse` that causes certain port numbers +containing whitespace, underscores, plus and minus signs, or non-ASCII +digits to be incorrectly accepted. + +.. + +.. date: 2022-10-14-12-29-05 +.. gh-issue: 98257 +.. nonce: aMSMs2 +.. section: Library + +Make :func:`sys.setprofile` and :func:`sys.settrace` functions reentrant. +They can no long fail with: ``RuntimeError("Cannot install a trace function +while another trace function is being installed")``. Patch by Victor +Stinner. + +.. + +.. date: 2022-10-14-11-46-31 +.. gh-issue: 98251 +.. nonce: Uxc9al +.. section: Library + +Allow :mod:`venv` to pass along :envvar:`PYTHON*` variables to ``ensurepip`` +and ``pip`` when they do not impact path resolution + +.. + +.. date: 2022-10-12-11-20-54 +.. gh-issue: 94597 +.. nonce: GYJZlb +.. section: Library + +Deprecated :meth:`asyncio.AbstractEventLoopPolicy.get_child_watcher` and +:meth:`asyncio.AbstractEventLoopPolicy.set_child_watcher` methods to be +removed in Python 3.14. Patch by Kumar Aditya. + +.. + +.. date: 2022-10-12-10-00-40 +.. gh-issue: 98178 +.. nonce: hspH51 +.. section: Library + +On macOS, fix a crash in :func:`syslog.syslog` in multi-threaded +applications. On macOS, the libc ``syslog()`` function is not thread-safe, +so :func:`syslog.syslog` no longer releases the GIL to call it. Patch by +Victor Stinner. + +.. + +.. date: 2022-10-10-09-52-21 +.. gh-issue: 44098 +.. nonce: okcqJt +.. section: Library + +Release the GIL when creating :class:`mmap.mmap` objects on Unix. + +.. + +.. date: 2022-10-09-12-12-38 +.. gh-issue: 87730 +.. nonce: ClgP3f +.. section: Library + +Wrap network errors consistently in urllib FTP support, so the test suite +doesn't fail when a network is available but the public internet is not +reachable. + +.. + +.. date: 2022-10-08-06-59-46 +.. gh-issue: 94597 +.. nonce: TsS0oT +.. section: Library + +The child watcher classes :class:`~asyncio.MultiLoopChildWatcher`, +:class:`~asyncio.FastChildWatcher` and :class:`~asyncio.SafeChildWatcher` +are deprecated and will be removed in Python 3.14. Patch by Kumar Aditya. + +.. + +.. date: 2022-10-07-09-52-37 +.. gh-issue: 98023 +.. nonce: aliEcl +.. section: Library + +Change default child watcher to :class:`~asyncio.PidfdChildWatcher` on Linux +systems which supports it. Patch by Kumar Aditya. + +.. + +.. date: 2022-10-06-23-42-00 +.. gh-issue: 90985 +.. nonce: s280JY +.. section: Library + +Earlier in 3.11 we deprecated ``asyncio.Task.cancel("message")``. We +realized we were too harsh, and have undeprecated it. + +.. + +.. date: 2022-10-06-17-59-22 +.. gh-issue: 65961 +.. nonce: SXlQnI +.. section: Library + +Do not rely solely on ``__cached__`` on modules; code will also support +``__spec__.cached``. + +.. + +.. date: 2022-10-05-20-52-17 +.. gh-issue: 97646 +.. nonce: Q4fVww +.. section: Library + +Replace deprecated ``application/javascript`` with ``text/javascript`` in +:mod:`mimetypes`. See :rfc:`9239`. Patch by Noam Cohen. + +.. + +.. date: 2022-10-05-16-10-24 +.. gh-issue: 97930 +.. nonce: NPSrzE +.. section: Library + +Apply changes from importlib_resources 5.8 and 5.9: ``Traversable.joinpath`` +provides a concrete implementation. ``as_file`` now supports directories of +resources. + +.. + +.. date: 2022-10-05-11-40-02 +.. gh-issue: 97850 +.. nonce: NzdREm +.. section: Library + +Remove deprecated :func:`importlib.utils.set_loader` and +:func:`importlib.utils.module_for_loader` from :mod:`importlib.utils`. + +.. + +.. date: 2022-10-04-21-21-41 +.. gh-issue: 97837 +.. nonce: 19q-eg +.. section: Library + +Change deprecate warning message in :mod:`unittest` from + +``It is deprecated to return a value!=None`` + +to + +``It is deprecated to return a value that is not None from a test case`` + +.. + +.. date: 2022-10-04-07-55-19 +.. gh-issue: 97825 +.. nonce: mNdv1l +.. section: Library + +Fixes :exc:`AttributeError` when :meth:`subprocess.check_output` is used +with argument ``input=None`` and either of the arguments *encoding* or +*errors* are used. + +.. + +.. date: 2022-10-04-00-43-43 +.. gh-issue: 97008 +.. nonce: 3rjtt6 +.. section: Library + +:exc:`NameError` and :exc:`AttributeError` spelling suggestions provided +since :gh:`82711` are now also emitted by the pure Python :mod:`traceback` +module. Tests for those suggestions now exercise both implementations to +ensure they are equivalent. Patch by Carl Friedrich Bolz-Tereick and Łukasz +Langa. + +.. + +.. date: 2022-10-03-14-42-13 +.. gh-issue: 97799 +.. nonce: Y1iJvf +.. section: Library + +:mod:`dataclass` now uses :func:`inspect.get_annotations` to examine the +annotations on class objects. + +.. + +.. date: 2022-10-03-13-25-19 +.. gh-issue: 97781 +.. nonce: gCLLef +.. section: Library + +Removed deprecated interfaces in ``importlib.metadata`` (entry points +accessed as dictionary, implicit dictionary construction of sequence of +``EntryPoint`` objects, mutablility of ``EntryPoints`` result, access of +entry point by index). ``entry_points`` now has a simpler, more +straightforward API (returning ``EntryPoints``). + +.. + +.. date: 2022-09-30-15-56-20 +.. gh-issue: 96827 +.. nonce: lzy1iw +.. section: Library + +Avoid spurious tracebacks from :mod:`asyncio` when default executor cleanup +is delayed until after the event loop is closed (e.g. as the result of a +keyboard interrupt). + +.. + +.. date: 2022-09-30-09-22-37 +.. gh-issue: 95534 +.. nonce: ndEfPj +.. section: Library + +:meth:`gzip.GzipFile.read` reads 10% faster. + +.. + +.. date: 2022-09-29-23-22-24 +.. gh-issue: 97592 +.. nonce: tpJg_J +.. section: Library + +Avoid a crash in the C version of +:meth:`asyncio.Future.remove_done_callback` when an evil argument is passed. + +.. + +.. date: 2022-09-29-08-15-55 +.. gh-issue: 97639 +.. nonce: JSjWYW +.. section: Library + +Remove ``tokenize.NL`` check from :mod:`tabnanny`. + +.. + +.. date: 2022-09-25-23-24-52 +.. gh-issue: 97545 +.. nonce: HZLSNt +.. section: Library + +Make Semaphore run faster. + +.. + +.. date: 2022-09-25-20-42-33 +.. gh-issue: 73588 +.. nonce: uVtjEA +.. section: Library + +Fix generation of the default name of :class:`tkinter.Checkbutton`. +Previously, checkbuttons in different parent widgets could have the same +short name and share the same state if arguments "name" and "variable" are +not specified. Now they are globally unique. + +.. + +.. date: 2022-09-24-18-56-23 +.. gh-issue: 96865 +.. nonce: o9WUkW +.. section: Library + +fix Flag to use boundary CONFORM + +This restores previous Flag behavior of allowing flags with non-sequential +values to be combined; e.g. + +class Skip(Flag): TWO = 2 EIGHT = 8 + +Skip.TWO | Skip.EIGHT -> <Skip.TWO|EIGHT: 10> + +.. + +.. date: 2022-09-22-14-35-02 +.. gh-issue: 97005 +.. nonce: yf21Q7 +.. section: Library + +Update bundled libexpat to 2.4.9 + +.. + +.. date: 2022-09-22-11-50-29 +.. gh-issue: 85760 +.. nonce: DETTPd +.. section: Library + +Fix race condition in :mod:`asyncio` where +:meth:`~asyncio.SubprocessProtocol.process_exited` called before the +:meth:`~asyncio.SubprocessProtocol.pipe_data_received` leading to +inconsistent output. Patch by Kumar Aditya. + +.. + +.. date: 2022-09-18-04-51-30 +.. gh-issue: 96704 +.. nonce: DmamRX +.. section: Library + +Pass the correct ``contextvars.Context`` when a ``asyncio`` exception +handler is called on behalf of a task or callback handle. This adds a new +``Task`` method, ``get_context``, and also a new ``Handle`` method with the +same name. If this method is not found on a task object (perhaps because it +is a third-party library that does not yet provide this method), the context +prevailing at the time the exception handler is called is used. + +.. + +.. date: 2022-09-17-13-15-10 +.. gh-issue: 96819 +.. nonce: 6RfqM7 +.. section: Library + +Fixed check in :mod:`multiprocessing.resource_tracker` that guarantees that +the length of a write to a pipe is not greater than ``PIPE_BUF``. + +.. + +.. date: 2022-09-16-07-53-29 +.. gh-issue: 95865 +.. nonce: oHjX0A +.. section: Library + +Reduce :func:`urllib.parse.quote_from_bytes` memory use on large values. + +Contributed by Dennis Sweeney. + +.. + +.. date: 2022-09-15-00-37-33 +.. gh-issue: 96741 +.. nonce: 4b6czN +.. section: Library + +Corrected type annotation for dataclass attribute +``pstats.FunctionProfile.ncalls`` to be ``str``. + +.. + +.. date: 2022-09-13-15-12-31 +.. gh-issue: 96734 +.. nonce: G08vjz +.. section: Library + +Update :mod:`unicodedata` database to Unicode 15.0.0. + +.. + +.. date: 2022-09-10-16-46-16 +.. gh-issue: 96735 +.. nonce: 0YzJuG +.. section: Library + +Fix undefined behaviour in :func:`struct.unpack`. + +.. + +.. date: 2022-09-08-20-12-48 +.. gh-issue: 46412 +.. nonce: r_cfTh +.. section: Library + +Improve performance of ``bool(db)`` for large ndb/gdb databases. Previously +this would call ``len(db)`` which would iterate over all keys -- the answer +(empty or not) is known after the first key. + +.. + +.. date: 2022-09-07-22-49-37 +.. gh-issue: 96652 +.. nonce: YqOKxI +.. section: Library + +Fix the faulthandler implementation of ``faulthandler.register(signal, +chain=True)`` if the ``sigaction()`` function is not available: don't call +the previous signal handler if it's NULL. Patch by Victor Stinner. + +.. + +.. date: 2022-09-04-12-32-52 +.. gh-issue: 68163 +.. nonce: h6TJCc +.. section: Library + +Correct conversion of :class:`numbers.Rational`'s to :class:`float`. + +.. + +.. date: 2022-09-03-18-39-05 +.. gh-issue: 96538 +.. nonce: W156-D +.. section: Library + +Speed up ``bisect.bisect()`` functions by taking advantage of +type-stability. + +.. + +.. date: 2022-09-01-13-54-38 +.. gh-issue: 96465 +.. nonce: 0IJmrH +.. section: Library + +Fraction hashes are now cached. + +.. + +.. date: 2022-08-31-11-10-21 +.. gh-issue: 96079 +.. nonce: uqrXdJ +.. section: Library + +In :mod:`typing`, fix missing field ``name`` and incorrect ``__module__`` in +_AnnotatedAlias. + +.. + +.. date: 2022-08-30-12-32-00 +.. gh-issue: 96415 +.. nonce: 6W7ORH +.. section: Library + +Remove ``types._cell_factory`` from module namespace. + +.. + +.. date: 2022-08-30-11-46-36 +.. gh-issue: 95987 +.. nonce: CV7_u4 +.. section: Library + +Fix ``repr`` of ``Any`` subclasses. + +.. + +.. date: 2022-08-29-16-54-36 +.. gh-issue: 96388 +.. nonce: dCpJcu +.. section: Library + +Work around missing socket functions in :class:`~socket.socket`'s +``__repr__``. + +.. + +.. date: 2022-08-29-15-28-39 +.. gh-issue: 96385 +.. nonce: uLRTsf +.. section: Library + +Fix ``TypeVarTuple.__typing_prepare_subst__``. ``TypeError`` was not raised +when using more than one ``TypeVarTuple``, like ``[*T, *V]`` in type alias +substitutions. + +.. + +.. date: 2022-08-29-12-49-30 +.. gh-issue: 96142 +.. nonce: PdCMez +.. section: Library + +Add ``match_args``, ``kw_only``, ``slots``, and ``weakref_slot`` to +``_DataclassParams``. + +.. + +.. date: 2022-08-29-12-35-28 +.. gh-issue: 96073 +.. nonce: WaGstf +.. section: Library + +In :mod:`inspect`, fix overeager replacement of "``typing.``" in formatting +annotations. + +.. + +.. date: 2022-08-29-07-04-03 +.. gh-issue: 89258 +.. nonce: ri7ncj +.. section: Library + +Added a :meth:`~logging.Logger.getChildren` method to +:class:`logging.Logger`, to get the immediate child loggers of a logger. + +.. + +.. date: 2022-08-27-23-16-09 +.. gh-issue: 96346 +.. nonce: jJX14I +.. section: Library + +Use double caching for compiled RE patterns. + +.. + +.. date: 2022-08-27-21-26-52 +.. gh-issue: 96349 +.. nonce: XyYLlO +.. section: Library + +Fixed a minor performance regression in :func:`threading.Event.__init__` + +.. + +.. date: 2022-08-27-14-38-49 +.. gh-issue: 90467 +.. nonce: VOOB0p +.. section: Library + +Fix :class:`asyncio.streams.StreamReaderProtocol` to keep a strong reference +to the created task, so that it's not garbage collected + +.. + +.. date: 2022-08-23-13-30-30 +.. gh-issue: 96172 +.. nonce: 7WTHer +.. section: Library + +Fix a bug in ``unicodedata``: ``east_asian_width`` used to return the wrong +value for unassigned characters; and for yet unassigned, but reserved +characters. + +.. + +.. date: 2022-08-22-18-42-17 +.. gh-issue: 96159 +.. nonce: 3bFU39 +.. section: Library + +Fix a performance regression in logging TimedRotatingFileHandler. Only check +for special files when the rollover time has passed. + +.. + +.. date: 2022-08-22-13-54-20 +.. gh-issue: 96175 +.. nonce: bH7zGU +.. section: Library + +Fix unused ``localName`` parameter in the ``Attr`` class in +:mod:`xml.dom.minidom`. + +.. + +.. date: 2022-08-20-12-56-15 +.. gh-issue: 96145 +.. nonce: 8ah3pE +.. section: Library + +Add AttrDict to JSON module for use with object_hook. + +.. + +.. date: 2022-08-20-10-31-01 +.. gh-issue: 96052 +.. nonce: a6FhaD +.. section: Library + +Fix handling compiler warnings (SyntaxWarning and DeprecationWarning) in +:func:`codeop.compile_command` when checking for incomplete input. +Previously it emitted warnings and raised a SyntaxError. Now it always +returns ``None`` for incomplete input without emitting any warnings. + +.. + +.. date: 2022-08-19-18-21-01 +.. gh-issue: 96125 +.. nonce: ODcF1Y +.. section: Library + +Fix incorrect condition that causes ``sys.thread_info.name`` to be wrong on +pthread platforms. + +.. + +.. date: 2022-08-19-10-19-32 +.. gh-issue: 96019 +.. nonce: b7uAVP +.. section: Library + +Fix a bug in the ``makeunicodedata.py`` script leading to about 13 KiB of +space saving in the ``unicodedata`` module, specifically the character +decomposition data. + +.. + +.. date: 2022-08-18-14-53-53 +.. gh-issue: 95463 +.. nonce: GpP05c +.. section: Library + +Remove an incompatible change from :issue:`28080` that caused a regression +that ignored the utf8 in ``ZipInfo.flag_bits``. Patch by Pablo Galindo. + +.. + +.. date: 2022-08-14-18-59-54 +.. gh-issue: 69142 +.. nonce: 6is5Pq +.. section: Library + +Add ``%:z`` strftime format code (generates tzoffset with colons as +separator), see :ref:`strftime-strptime-behavior`. + +.. + +.. date: 2022-08-11-18-52-17 +.. gh-issue: 95899 +.. nonce: _Bi4uG +.. section: Library + +Fix :class:`asyncio.Runner` to call :func:`asyncio.set_event_loop` only once +to avoid calling :meth:`~asyncio.AbstractChildWatcher.attach_loop` multiple +times on child watchers. Patch by Kumar Aditya. + +.. + +.. date: 2022-08-11-18-22-29 +.. gh-issue: 95736 +.. nonce: LzRZXe +.. section: Library + +Fix :class:`unittest.IsolatedAsyncioTestCase` to set event loop before +calling setup functions. Patch by Kumar Aditya. + +.. + +.. date: 2022-08-11-03-16-48 +.. gh-issue: 95865 +.. nonce: 0IOkFP +.. section: Library + +Speed up :func:`urllib.parse.quote_from_bytes` by replacing a list +comprehension with ``map()``. + +.. + +.. date: 2022-08-10-17-34-07 +.. gh-issue: 95861 +.. nonce: qv-T5s +.. section: Library + +Add support for computing Spearman's correlation coefficient to the existing +statistics.correlation() function. + +.. + +.. date: 2022-08-10-11-54-04 +.. gh-issue: 95804 +.. nonce: i5FCFK +.. section: Library + +Fix ``logging`` shutdown handler so it respects +``MemoryHandler.flushOnClose``. + +.. + +.. date: 2022-08-08-01-42-11 +.. gh-issue: 95704 +.. nonce: MOPFfX +.. section: Library + +When a task catches :exc:`asyncio.CancelledError` and raises some other +error, the other error should generally not silently be suppressed. + +.. + +.. date: 2022-08-07-14-56-23 +.. gh-issue: 95149 +.. nonce: U0c6Ib +.. section: Library + +The :class:`HTTPStatus <http.HTTPStatus>` enum offers a couple of properties +to indicate the HTTP status category e.g. ``HTTPStatus.OK.is_success``. + +.. + +.. date: 2022-08-03-21-01-17 +.. gh-issue: 95609 +.. nonce: xxyjyX +.. section: Library + +Update bundled pip to 22.2.2. + +.. + +.. date: 2022-08-03-16-52-32 +.. gh-issue: 95289 +.. nonce: FMnHlV +.. section: Library + +Fix :class:`asyncio.TaskGroup` to propagate exception when +:exc:`asyncio.CancelledError` was replaced with another exception by a +context manger. Patch by Kumar Aditya and Guido van Rossum. + +.. + +.. date: 2022-07-29-20-58-37 +.. gh-issue: 94909 +.. nonce: YjMusj +.. section: Library + +Fix incorrect joining of relative Windows paths with drives in +:class:`pathlib.PurePath` initializer. + +.. + +.. date: 2022-07-28-17-14-38 +.. gh-issue: 95385 +.. nonce: 6YlsDI +.. section: Library + +Faster ``json.dumps()`` when sorting of keys is not requested (default). + +.. + +.. date: 2022-07-27-19-47-51 +.. gh-issue: 83901 +.. nonce: OSw06c +.. section: Library + +Improve :meth:`Signature.bind <inspect.Signature.bind>` error message for +missing keyword-only arguments. + +.. + +.. date: 2022-07-27-19-43-07 +.. gh-issue: 95339 +.. nonce: NuVQ68 +.. section: Library + +Update bundled pip to 22.2.1. + +.. + +.. date: 2022-07-27-11-35-45 +.. gh-issue: 95045 +.. nonce: iysT-Q +.. section: Library + +Fix GC crash when deallocating ``_lsprof.Profiler`` by untracking it before +calling any callbacks. Patch by Kumar Aditya. + +.. + +.. date: 2022-07-25-15-45-06 +.. gh-issue: 95231 +.. nonce: i807-g +.. section: Library + +Fail gracefully if :data:`~errno.EPERM` or :data:`~errno.ENOSYS` is raised +when loading :mod:`crypt` methods. This may happen when trying to load +``MD5`` on a Linux kernel with :abbr:`FIPS (Federal Information Processing +Standard)` enabled. + +.. + +.. date: 2022-07-24-18-00-42 +.. gh-issue: 95097 +.. nonce: lu5qNf +.. section: Library + +Fix :func:`asyncio.run` for :class:`asyncio.Task` implementations without +:meth:`~asyncio.Task.uncancel` method. Patch by Kumar Aditya. + +.. + +.. date: 2022-07-24-12-59-02 +.. gh-issue: 95087 +.. nonce: VvqXkN +.. section: Library + +Fix IndexError in parsing invalid date in the :mod:`email` module. + +.. + +.. date: 2022-07-24-12-00-06 +.. gh-issue: 95199 +.. nonce: -5A64k +.. section: Library + +Upgrade bundled setuptools to 63.2.0. + +.. + +.. date: 2022-07-24-09-15-35 +.. gh-issue: 95194 +.. nonce: ERVmqG +.. section: Library + +Upgrade bundled pip to 22.2. + +.. + +.. date: 2022-07-23-10-50-05 +.. gh-issue: 93899 +.. nonce: VT34A5 +.. section: Library + +Fix check for existence of :data:`os.EFD_CLOEXEC`, :data:`os.EFD_NONBLOCK` +and :data:`os.EFD_SEMAPHORE` flags on older kernel versions where these +flags are not present. Patch by Kumar Aditya. + +.. + +.. date: 2022-07-23-10-42-05 +.. gh-issue: 95166 +.. nonce: xw6p3C +.. section: Library + +Fix :meth:`concurrent.futures.Executor.map` to cancel the currently waiting +on future on an error - e.g. TimeoutError or KeyboardInterrupt. + +.. + +.. date: 2022-07-22-21-18-17 +.. gh-issue: 95132 +.. nonce: n9anlw +.. section: Library + +Fix a :mod:`sqlite3` regression where ``*args`` and ``**kwds`` were +incorrectly relayed from :py:func:`~sqlite3.connect` to the +:class:`~sqlite3.Connection` factory. The regression was introduced in +3.11a1 with PR 24421 (:gh:`85128`). Patch by Erlend E. Aasland.` + +.. + +.. date: 2022-07-22-17-19-57 +.. gh-issue: 93157 +.. nonce: RXByAk +.. section: Library + +Fix :mod:`fileinput` module didn't support ``errors`` option when +``inplace`` is true. + +.. + +.. date: 2022-07-22-09-09-08 +.. gh-issue: 91212 +.. nonce: 53O8Ab +.. section: Library + +Fixed flickering of the turtle window when the tracer is turned off. Patch +by Shin-myoung-serp. + +.. + +.. date: 2022-07-22-00-58-49 +.. gh-issue: 95077 +.. nonce: 4Z6CNC +.. section: Library + +Add deprecation warning for enum ``member.member`` access (e.g. +``Color.RED.BLUE``). + +.. + +.. date: 2022-07-21-22-59-22 +.. gh-issue: 95109 +.. nonce: usxA9r +.. section: Library + +Ensure that timeouts scheduled with :class:`asyncio.Timeout` that have +already expired are delivered promptly. + +.. + +.. date: 2022-07-21-19-55-49 +.. gh-issue: 95105 +.. nonce: BIX2Km +.. section: Library + +:meth:`wsgiref.types.InputStream.__iter__` should return +``Iterator[bytes]``, not ``Iterable[bytes]``. Patch by Shantanu Jain. + +.. + +.. date: 2022-07-20-22-49-48 +.. gh-issue: 95066 +.. nonce: TuCu0E +.. section: Library + +Replaced assert with exception in :func:`ast.parse`, when +``feature_version`` has an invalid major version. Patch by Shantanu Jain. + +.. + +.. date: 2022-07-20-00-23-58 +.. gh-issue: 77617 +.. nonce: XGaqSQ +.. section: Library + +Add :mod:`sqlite3` :ref:`command-line interface <sqlite3-cli>`. Patch by +Erlend Aasland. + +.. + +.. date: 2022-07-19-15-37-11 +.. gh-issue: 95005 +.. nonce: iRmZ74 +.. section: Library + +Replace :c:expr:`_PyAccu` with :c:expr:`_PyUnicodeWriter` in JSON encoder +and StringIO and remove the :c:expr:`_PyAccu` implementation. + +.. + +.. date: 2022-07-17-22-31-32 +.. gh-issue: 90085 +.. nonce: c4FWcS +.. section: Library + +Remove ``-c/--clock`` and ``-t/--time`` CLI options of :mod:`timeit`. The +options had been deprecated since Python 3.3 and the functionality was +removed in Python 3.7. Patch by Shantanu Jain. + +.. + +.. date: 2022-07-15-08-13-51 +.. gh-issue: 94857 +.. nonce: 9_KvZJ +.. section: Library + +Fix refleak in ``_io.TextIOWrapper.reconfigure``. Patch by Kumar Aditya. + +.. + +.. date: 2022-07-14-00-43-52 +.. gh-issue: 94821 +.. nonce: e17ghU +.. section: Library + +Fix binding of unix socket to empty address on Linux to use an available +address from the abstract namespace, instead of "\0". + +.. + +.. date: 2022-07-11-10-41-48 +.. gh-issue: 94736 +.. nonce: EbsgeK +.. section: Library + +Fix crash when deallocating an instance of a subclass of +``_multiprocessing.SemLock``. Patch by Kumar Aditya. + +.. + +.. date: 2022-07-09-15-17-02 +.. gh-issue: 81620 +.. nonce: L0O_bV +.. section: Library + +Add random.binomialvariate(). + +.. + +.. date: 2022-07-09-08-55-04 +.. gh-issue: 74116 +.. nonce: 0XwYC1 +.. section: Library + +Allow :meth:`asyncio.StreamWriter.drain` to be awaited concurrently by +multiple tasks. Patch by Kumar Aditya. + +.. + +.. date: 2022-07-08-17-49-12 +.. gh-issue: 87822 +.. nonce: F9dzkf +.. section: Library + +When called with ``capture_locals=True``, the :mod:`traceback` module +functions swallow exceptions raised from calls to ``repr()`` on local +variables of frames. This is in order to prioritize the original exception +over rendering errors. An indication of the failure is printed in place of +the missing value. (Patch by Simon-Martin Schroeder). + +.. + +.. date: 2022-07-08-08-39-35 +.. gh-issue: 88050 +.. nonce: 0aOC_m +.. section: Library + +Fix :mod:`asyncio` subprocess transport to kill process cleanly when process +is blocked and avoid ``RuntimeError`` when loop is closed. Patch by Kumar +Aditya. + +.. + +.. date: 2022-07-07-15-46-55 +.. gh-issue: 94637 +.. nonce: IYEiUM +.. section: Library + +:meth:`SSLContext.set_default_verify_paths` now releases the GIL around +``SSL_CTX_set_default_verify_paths`` call. The function call performs I/O +and CPU intensive work. + +.. + +.. date: 2022-07-06-22-41-51 +.. gh-issue: 94309 +.. nonce: _XswsX +.. section: Library + +Deprecate aliases :class:`typing.Hashable` and :class:`typing.Sized` + +.. + +.. date: 2022-07-06-21-24-03 +.. gh-issue: 92546 +.. nonce: s5Upkh +.. section: Library + +An undocumented ``python -m pprint`` benchmark is moved into ``pprint`` +suite of pyperformance. Patch by Oleg Iarygin. + +.. + +.. date: 2022-07-06-16-01-08 +.. gh-issue: 94607 +.. nonce: Q6RYfz +.. section: Library + +Fix subclassing complex generics with type variables in :mod:`typing`. +Previously an error message saying ``Some type variables ... are not listed +in Generic[...]`` was shown. :mod:`typing` no longer populates +``__parameters__`` with the ``__parameters__`` of a Python class. + +.. + +.. date: 2022-07-06-14-57-33 +.. gh-issue: 94619 +.. nonce: PRqKVX +.. section: Library + +Remove the long-deprecated ``module_repr()`` from :mod:`importlib`. + +.. + +.. date: 2022-07-06-14-45-12 +.. gh-issue: 93910 +.. nonce: iZcp67 +.. section: Library + +The ability to access the other values of an enum on an enum (e.g. +``Color.RED.BLUE``) has been restored in order to fix a performance +regression. + +.. + +.. date: 2022-07-06-06-02-02 +.. gh-issue: 93896 +.. nonce: vIgWGr +.. section: Library + +Fix :func:`asyncio.run` and :class:`unittest.IsolatedAsyncioTestCase` to +always the set event loop as it was done in Python 3.10 and earlier. Patch +by Kumar Aditya. + +.. + +.. date: 2022-07-05-17-22-00 +.. gh-issue: 94343 +.. nonce: kf4H5r +.. section: Library + +Allow setting the attributes of ``reprlib.Repr`` during object +initialization + +.. + +.. date: 2022-07-03-16-41-03 +.. gh-issue: 94382 +.. nonce: zuVZeM +.. section: Library + +Port static types of ``_multiprocessing`` module to heap types. Patch by +Kumar Aditya. + +.. + +.. date: 2022-07-03-16-26-35 +.. gh-issue: 78724 +.. nonce: XNiJzf +.. section: Library + +Fix crash in :class:`struct.Struct` when it was not completely initialized +by initializing it in :meth:`~object.__new__``. Patch by Kumar Aditya. + +.. + +.. date: 2022-07-02-19-46-30 +.. gh-issue: 94510 +.. nonce: xOatDC +.. section: Library + +Re-entrant calls to :func:`sys.setprofile` and :func:`sys.settrace` now +raise :exc:`RuntimeError`. Patch by Pablo Galindo. + +.. + +.. date: 2022-06-29-09-48-37 +.. gh-issue: 92336 +.. nonce: otA6c6 +.. section: Library + +Fix bug where :meth:`linecache.getline` fails on bad files with +:exc:`UnicodeDecodeError` or :exc:`SyntaxError`. It now returns an empty +string as per the documentation. + +.. + +.. date: 2022-06-29-04-42-56 +.. gh-issue: 94398 +.. nonce: YOq_bJ +.. section: Library + +Once a :class:`asyncio.TaskGroup` has started shutting down (i.e., at least +one task has failed and the task group has started cancelling the remaining +tasks), it should not be possible to add new tasks to the task group. + +.. + +.. date: 2022-06-28-14-41-22 +.. gh-issue: 94383 +.. nonce: CXnquo +.. section: Library + +:mod:`xml.etree`: Remove the ``ElementTree.Element.copy()`` method of the +pure Python implementation, deprecated in Python 3.10, use the +:func:`copy.copy` function instead. The C implementation of :mod:`xml.etree` +has no ``copy()`` method, only a ``__copy__()`` method. Patch by Victor +Stinner. + +.. + +.. date: 2022-06-28-14-29-21 +.. gh-issue: 94379 +.. nonce: RrgKfh +.. section: Library + +:mod:`zipimport`: Remove ``find_loader()`` and ``find_module()`` methods, +deprecated in Python 3.10: use the ``find_spec()`` method instead. See +:pep:`451` for the rationale. Patch by Victor Stinner. + +.. + +.. date: 2022-06-28-00-24-48 +.. gh-issue: 94352 +.. nonce: JY1Ayt +.. section: Library + +:func:`shlex.split`: Passing ``None`` for *s* argument now raises an +exception, rather than reading :data:`sys.stdin`. The feature was deprecated +in Python 3.9. Patch by Victor Stinner. + +.. + +.. date: 2022-06-27-10-33-18 +.. gh-issue: 94318 +.. nonce: jR4_QV +.. section: Library + +Strip trailing spaces in :mod:`pydoc` text output. + +.. + +.. date: 2022-06-26-10-59-15 +.. gh-issue: 89988 +.. nonce: K8rnmt +.. section: Library + +Fix memory leak in :class:`pickle.Pickler` when looking up +:attr:`dispatch_table`. Patch by Kumar Aditya. + +.. + +.. date: 2022-06-25-23-44-44 +.. gh-issue: 90016 +.. nonce: EB409s +.. section: Library + +Deprecate :mod:`sqlite3` :ref:`default adapters and converters +<sqlite3-default-converters>`. Patch by Erlend E. Aasland. + +.. + +.. date: 2022-06-25-16-27-02 +.. gh-issue: 94254 +.. nonce: beP16v +.. section: Library + +Fixed types of :mod:`struct` module to be immutable. Patch by Kumar Aditya. + +.. + +.. date: 2022-06-25-13-38-53 +.. gh-issue: 93259 +.. nonce: FAGw-2 +.. section: Library + +Now raise ``ValueError`` when ``None`` or an empty string are passed to +``Distribution.from_name`` (and other callers). + +.. + +.. date: 2022-06-25-09-12-23 +.. gh-issue: 74696 +.. nonce: fxC9ua +.. section: Library + +:func:`shutil.make_archive` now passes the *root_dir* argument to custom +archivers which support it. + +.. + +.. date: 2022-06-24-20-00-57 +.. gh-issue: 94216 +.. nonce: hxnQPu +.. section: Library + +The :mod:`dis` module now has the opcodes for pseudo instructions (those +which are used by the compiler during code generation but then removed or +replaced by real opcodes before the final bytecode is emitted). + +.. + +.. date: 2022-06-24-19-40-40 +.. gh-issue: 93096 +.. nonce: 3RlK2d +.. section: Library + +Removed undocumented ``python -m codecs``. Use ``python -m unittest +test.test_codecs.EncodedFileTest`` instead. + +.. + +.. date: 2022-06-24-19-23-59 +.. gh-issue: 94207 +.. nonce: VhS1eS +.. section: Library + +Made :class:`_struct.Struct` GC-tracked in order to fix a reference leak in +the :mod:`_struct` module. + +.. + +.. date: 2022-06-24-19-16-09 +.. gh-issue: 93096 +.. nonce: r1_oIc +.. section: Library + +Removed undocumented ``-t`` argument of ``python -m base64``. Use ``python +-m unittest test.test_base64.LegacyBase64TestCase.test_encodebytes`` +instead. + +.. + +.. date: 2022-06-24-18-20-42 +.. gh-issue: 94226 +.. nonce: 8ZL4Fm +.. section: Library + +Remove the :func:`locale.format` function, deprecated in Python 3.7: use +:func:`locale.format_string` instead. Patch by Victor Stinner. + +.. + +.. date: 2022-06-24-17-11-33 +.. gh-issue: 94199 +.. nonce: 7releN +.. section: Library + +Remove the :func:`ssl.match_hostname` function. The +:func:`ssl.match_hostname` was deprecated in Python 3.7. OpenSSL performs +hostname matching since Python 3.7, Python no longer uses the +:func:`ssl.match_hostname` function. Patch by Victor Stinner. + +.. + +.. date: 2022-06-24-14-25-26 +.. gh-issue: 94214 +.. nonce: 03pXR5 +.. section: Library + +Document the ``context`` object used in the ``venv.EnvBuilder`` class, and +add the new environment's library path to it. + +.. + +.. date: 2022-06-24-10-39-56 +.. gh-issue: 94199 +.. nonce: MIuckY +.. section: Library + +Remove the :func:`ssl.wrap_socket` function, deprecated in Python 3.7: +instead, create a :class:`ssl.SSLContext` object and call its +:class:`ssl.SSLContext.wrap_socket` method. Any package that still uses +:func:`ssl.wrap_socket` is broken and insecure. The function neither sends a +SNI TLS extension nor validates server hostname. Code is subject to `CWE-295 +<https://cwe.mitre.org/data/definitions/295.html>`_: Improper Certificate +Validation. Patch by Victor Stinner. + +.. + +.. date: 2022-06-24-10-29-19 +.. gh-issue: 94199 +.. nonce: pfehmz +.. section: Library + +Remove the :func:`ssl.RAND_pseudo_bytes` function, deprecated in Python 3.6: +use :func:`os.urandom` or :func:`ssl.RAND_bytes` instead. Patch by Victor +Stinner. + +.. + +.. date: 2022-06-24-10-18-59 +.. gh-issue: 94199 +.. nonce: kYOo8g +.. section: Library + +:mod:`hashlib`: Remove the pure Python implementation of +:func:`hashlib.pbkdf2_hmac()`, deprecated in Python 3.10. Python 3.10 and +newer requires OpenSSL 1.1.1 (:pep:`644`): this OpenSSL version provides a C +implementation of :func:`~hashlib.pbkdf2_hmac()` which is faster. Patch by +Victor Stinner. + +.. + +.. date: 2022-06-24-09-41-41 +.. gh-issue: 94196 +.. nonce: r2KyfS +.. section: Library + +:mod:`gzip`: Remove the ``filename`` attribute of :class:`gzip.GzipFile`, +deprecated since Python 2.6, use the :attr:`~gzip.GzipFile.name` attribute +instead. In write mode, the ``filename`` attribute added ``'.gz'`` file +extension if it was not present. Patch by Victor Stinner. + +.. + +.. date: 2022-06-24-08-49-47 +.. gh-issue: 94182 +.. nonce: Wknau0 +.. section: Library + +run the :class:`asyncio.PidfdChildWatcher` on the running loop, this allows +event loops to run subprocesses when there is no default event loop running +on the main thread + +.. + +.. date: 2022-06-23-14-35-10 +.. gh-issue: 94169 +.. nonce: jeba90 +.. section: Library + +Remove ``io.OpenWrapper`` and ``_pyio.OpenWrapper``, deprecated in Python +3.10: just use :func:`open` instead. The :func:`open` (:func:`io.open`) +function is a built-in function. Since Python 3.10, :func:`_pyio.open` is +also a static method. Patch by Victor Stinner. + +.. + +.. date: 2022-06-23-13-12-05 +.. gh-issue: 91742 +.. nonce: sNytVX +.. section: Library + +Fix :mod:`pdb` crash after jump caused by a null pointer dereference. Patch +by Kumar Aditya. + +.. + +.. date: 2022-06-22-11-16-11 +.. gh-issue: 94101 +.. nonce: V9vDG8 +.. section: Library + +Manual instantiation of :class:`ssl.SSLSession` objects is no longer allowed +as it lead to misconfigured instances that crashed the interpreter when +attributes where accessed on them. + +.. + +.. date: 2022-06-21-11-40-31 +.. gh-issue: 84753 +.. nonce: FW1pxO +.. section: Library + +:func:`inspect.iscoroutinefunction`, :func:`inspect.isgeneratorfunction`, +and :func:`inspect.isasyncgenfunction` now properly return ``True`` for +duck-typed function-like objects like instances of +:class:`unittest.mock.AsyncMock`. + +This makes :func:`inspect.iscoroutinefunction` consistent with the behavior +of :func:`asyncio.iscoroutinefunction`. Patch by Mehdi ABAAKOUK. + +.. + +.. date: 2022-06-20-23-14-43 +.. gh-issue: 94028 +.. nonce: UofEcX +.. section: Library + +Fix a regression in the :mod:`sqlite3` where statement objects were not +properly cleared and reset after use in cursor iters. The regression was +introduced by PR 27884 in Python 3.11a1. Patch by Erlend E. Aasland. + +.. + +.. date: 2022-06-18-15-06-54 +.. gh-issue: 93973 +.. nonce: 4y6UQT +.. section: Library + +Add keyword argument ``all_errors`` to ``asyncio.create_connection`` so that +multiple connection errors can be raised as an ``ExceptionGroup``. + +.. + +.. date: 2022-06-17-16-00-55 +.. gh-issue: 93963 +.. nonce: 8YYZ-2 +.. section: Library + +Officially deprecate from ``importlib.abc`` classes moved to +``importlib.resources.abc``. + +.. + +.. date: 2022-06-17-12-02-30 +.. gh-issue: 93858 +.. nonce: R49ARc +.. section: Library + +Prevent error when activating venv in nested fish instances. + +.. + +.. date: 2022-06-16-11-16-53 +.. gh-issue: 93820 +.. nonce: 00X0Y5 +.. section: Library + +Pickle :class:`enum.Flag` by name. + +.. + +.. date: 2022-06-16-09-24-50 +.. gh-issue: 93847 +.. nonce: kuv8bN +.. section: Library + +Fix repr of enum of generic aliases. + +.. + +.. date: 2022-06-15-21-35-11 +.. gh-issue: 91404 +.. nonce: 39TZzW +.. section: Library + +Revert the :mod:`re` memory leak when a match is terminated by a signal or +memory allocation failure as the implemented fix caused a major performance +regression. + +.. + +.. date: 2022-06-15-21-28-16 +.. gh-issue: 83499 +.. nonce: u3DQJ- +.. section: Library + +Fix double closing of file description in :mod:`tempfile`. + +.. + +.. date: 2022-06-15-21-20-02 +.. gh-issue: 93820 +.. nonce: FAMLY8 +.. section: Library + +Fixed a regression when :func:`copy.copy`-ing :class:`enum.Flag` with +multiple flag members. + +.. + +.. date: 2022-06-11-13-32-17 +.. gh-issue: 79512 +.. nonce: A1KTDr +.. section: Library + +Fixed names and ``__module__`` value of :mod:`weakref` classes +:class:`~weakref.ReferenceType`, :class:`~weakref.ProxyType`, +:class:`~weakref.CallableProxyType`. It makes them pickleable. + +.. + +.. date: 2022-06-09-17-15-26 +.. gh-issue: 91389 +.. nonce: OE4vS5 +.. section: Library + +Fix an issue where :mod:`dis` utilities could report missing or incorrect +position information in the presence of ``CACHE`` entries. + +.. + +.. date: 2022-06-09-14-44-21 +.. gh-issue: 93626 +.. nonce: sfghs46 +.. section: Library + +Set ``__future__.annotations`` to have a ``None`` mandatoryRelease to +indicate that it is currently 'TBD'. + +.. + +.. date: 2022-06-09-10-12-55 +.. gh-issue: 90473 +.. nonce: 683m_C +.. section: Library + +Emscripten and WASI have no home directory and cannot provide :pep:`370` +user site directory. + +.. + +.. date: 2022-06-08-20-11-02 +.. gh-issue: 90494 +.. nonce: LIZT85 +.. section: Library + +:func:`copy.copy` and :func:`copy.deepcopy` now always raise a TypeError if +``__reduce__()`` returns a tuple with length 6 instead of silently ignore +the 6th item or produce incorrect result. + +.. + +.. date: 2022-06-07-14-53-46 +.. gh-issue: 90549 +.. nonce: T4FMKY +.. section: Library + +Fix a multiprocessing bug where a global named resource (such as a +semaphore) could leak when a child process is spawned (as opposed to +forked). + +.. + +.. date: 2022-06-06-13-19-43 +.. gh-issue: 93521 +.. nonce: _vE8m9 +.. section: Library + +Fixed a case where dataclasses would try to add ``__weakref__`` into the +``__slots__`` for a dataclass that specified ``weakref_slot=True`` when it +was already defined in one of its bases. This resulted in a ``TypeError`` +upon the new class being created. + +.. + +.. date: 2022-06-06-12-58-27 +.. gh-issue: 79579 +.. nonce: e8rB-M +.. section: Library + +:mod:`sqlite3` now correctly detects DML queries with leading comments. +Patch by Erlend E. Aasland. + +.. + +.. date: 2022-06-05-22-22-42 +.. gh-issue: 93421 +.. nonce: 43UO_8 +.. section: Library + +Update :data:`sqlite3.Cursor.rowcount` when a DML statement has run to +completion. This fixes the row count for SQL queries like ``UPDATE ... +RETURNING``. Patch by Erlend E. Aasland. + +.. + +.. date: 2022-06-04-00-11-54 +.. gh-issue: 93475 +.. nonce: vffFw1 +.. section: Library + +Expose ``FICLONE`` and ``FICLONERANGE`` constants in :mod:`fcntl`. Patch by +Illia Volochii. + +.. + +.. date: 2022-06-03-22-13-28 +.. gh-issue: 93370 +.. nonce: tjfu9L +.. section: Library + +Deprecate :data:`sqlite3.version` and :data:`sqlite3.version_info`. + +.. + +.. date: 2022-06-02-08-40-58 +.. gh-issue: 91810 +.. nonce: Gtk44w +.. section: Library + +Suppress writing an XML declaration in open files in ``ElementTree.write()`` +with ``encoding='unicode'`` and ``xml_declaration=None``. + +.. + +.. date: 2022-06-01-11-24-13 +.. gh-issue: 91162 +.. nonce: NxvU_u +.. section: Library + +Support splitting of unpacked arbitrary-length tuple over ``TypeVar`` and +``TypeVarTuple`` parameters. For example: + +* ``A[T, *Ts][*tuple[int, ...]]`` -> ``A[int, *tuple[int, ...]]`` +* ``A[*Ts, T][*tuple[int, ...]]`` -> ``A[*tuple[int, ...], int]`` + +.. + +.. date: 2022-05-31-14-58-40 +.. gh-issue: 93353 +.. nonce: 9Hvm6o +.. section: Library + +Fix the :func:`importlib.resources.as_file` context manager to remove the +temporary file if destroyed late during Python finalization: keep a local +reference to the :func:`os.remove` function. Patch by Victor Stinner. + +.. + +.. date: 2022-05-30-21-42-50 +.. gh-issue: 83658 +.. nonce: 01Ntx0 +.. section: Library + +Make :class:`multiprocessing.Pool` raise an exception if +``maxtasksperchild`` is not ``None`` or a positive int. + +.. + +.. date: 2022-05-28-08-02-55 +.. gh-issue: 93312 +.. nonce: HY0Uzj +.. section: Library + +Add :data:`os.PIDFD_NONBLOCK` flag to open a file descriptor for a process +with :func:`os.pidfd_open` in non-blocking mode. Patch by Kumar Aditya. + +.. + +.. date: 2022-05-27-22-17-11 +.. gh-issue: 88123 +.. nonce: mkYl5q +.. section: Library + +Implement Enum __contains__ that returns True or False to replace the +deprecated behaviour that would sometimes raise a TypeError. + +.. + +.. date: 2022-05-27-13-18-18 +.. gh-issue: 93297 +.. nonce: e2zuHz +.. section: Library + +Make asyncio task groups prevent child tasks from being GCed + +.. + +.. date: 2022-05-27-10-52-06 +.. gh-issue: 85308 +.. nonce: K6r-tJ +.. section: Library + +Changed :class:`argparse.ArgumentParser` to use :term:`filesystem encoding +and error handler` instead of default text encoding to read arguments from +file (e.g. ``fromfile_prefix_chars`` option). This change affects Windows; +argument file should be encoded with UTF-8 instead of ANSI Codepage. + +.. + +.. date: 2022-05-26-23-10-55 +.. gh-issue: 93156 +.. nonce: 4XfDVN +.. section: Library + +Accessing the :attr:`pathlib.PurePath.parents` sequence of an absolute path +using negative index values produced incorrect results. + +.. + +.. date: 2022-05-26-09-24-41 +.. gh-issue: 93162 +.. nonce: W1VuhU +.. section: Library + +Add the ability for :func:`logging.config.dictConfig` to usefully configure +:class:`~logging.handlers.QueueHandler` and +:class:`~logging.handlers.QueueListener` as a pair, and add +:func:`logging.getHandlerByName` and :func:`logging.getHandlerNames` APIs to +allow access to handlers by name. + +.. + +.. date: 2022-05-26-08-41-34 +.. gh-issue: 93243 +.. nonce: uw6x5z +.. section: Library + +The :mod:`smtpd` module was removed per the schedule in :pep:`594`. + +.. + +.. date: 2022-05-25-22-09-38 +.. gh-issue: 92886 +.. nonce: ylwDSc +.. section: Library + +Replace ``assert`` statements with ``raise AssertionError()`` in +:class:`~wsgiref.BaseHandler` so that the tested behaviour is maintained +running with optimizations ``(-O)``. + +.. + +.. date: 2022-05-25-15-57-39 +.. gh-issue: 90155 +.. nonce: YMstB5 +.. section: Library + +Fix broken :class:`asyncio.Semaphore` when acquire is cancelled. + +.. + +.. date: 2022-05-25-02-45-41 +.. gh-issue: 90817 +.. nonce: yxANgU +.. section: Library + +The :func:`locale.resetlocale` function is deprecated and will be removed in +Python 3.13. Use ``locale.setlocale(locale.LC_ALL, "")`` instead. Patch by +Victor Stinner. + +.. + +.. date: 2022-05-25-00-21-28 +.. gh-issue: 91513 +.. nonce: 9VyCT4 +.. section: Library + +Added ``taskName`` attribute to :mod:`logging` module for use with +:mod:`asyncio` tasks. + +.. + +.. date: 2022-05-24-11-19-04 +.. gh-issue: 74696 +.. nonce: -cnf-A +.. section: Library + +:func:`shutil.make_archive` no longer temporarily changes the current +working directory during creation of standard ``.zip`` or tar archives. + +.. + +.. date: 2022-05-24-10-59-02 +.. gh-issue: 92728 +.. nonce: zxTifq +.. section: Library + +The :func:`re.template` function and the corresponding :const:`re.TEMPLATE` +and :const:`re.T` flags are restored after they were removed in 3.11.0b1, +but they are now deprecated, so they might be removed from Python 3.13. + +.. + +.. date: 2022-05-22-23-46-18 +.. gh-issue: 93033 +.. nonce: wZfiL- +.. section: Library + +Search in some strings (platform dependent i.e [U+0xFFFF, U+0x0100] on +Windows or [U+0xFFFFFFFF, U+0x00010000] on Linux 64-bit) are now up to 10 +times faster. + +.. + +.. date: 2022-05-22-16-08-01 +.. gh-issue: 89973 +.. nonce: jc-Q4g +.. section: Library + +Fix :exc:`re.error` raised in :mod:`fnmatch` if the pattern contains a +character range with upper bound lower than lower bound (e.g. ``[c-a]``). +Now such ranges are interpreted as empty ranges. + +.. + +.. date: 2022-05-21-13-16-16 +.. gh-issue: 93044 +.. nonce: eJ_XkZ +.. section: Library + +No longer convert the database argument of :func:`sqlite3.connect` to bytes +before passing it to the factory. + +.. + +.. date: 2022-05-20-15-52-43 +.. gh-issue: 93010 +.. nonce: WF-cAc +.. section: Library + +In a very special case, the email package tried to append the nonexistent +``InvalidHeaderError`` to the defect list. It should have been +``InvalidHeaderDefect``. + +.. + +.. date: 2022-05-19-22-34-42 +.. gh-issue: 92986 +.. nonce: e6uKxj +.. section: Library + +Fix :func:`ast.unparse` when ``ImportFrom.level`` is None + +.. + +.. date: 2022-05-19-17-49-58 +.. gh-issue: 92932 +.. nonce: o2peTh +.. section: Library + +Now :func:`~dis.dis` and :func:`~dis.get_instructions` handle operand values +for instructions prefixed by ``EXTENDED_ARG_QUICK``. Patch by Sam Gross and +Dong-hee Na. + +.. + +.. date: 2022-05-19-13-33-18 +.. gh-issue: 92675 +.. nonce: ZeerMZ +.. section: Library + +Fix :func:`venv.ensure_directories` to accept :class:`pathlib.Path` +arguments in addition to :class:`str` paths. Patch by David Foster. + +.. + +.. date: 2022-05-18-21-04-09 +.. gh-issue: 87901 +.. nonce: lnf041 +.. section: Library + +Removed the ``encoding`` argument from :func:`os.popen` that was added in +3.11b1. + +.. + +.. date: 2022-05-18-17-18-41 +.. gh-issue: 91922 +.. nonce: DwWIsJ +.. section: Library + +Fix function :func:`sqlite.connect` and the :class:`sqlite.Connection` +constructor on non-UTF-8 locales. Also, they now support bytes paths +non-decodable with the current FS encoding. + +.. + +.. date: 2022-05-17-06-27-39 +.. gh-issue: 92869 +.. nonce: t8oBkw +.. section: Library + +Added :class:`~ctypes.c_time_t` to :mod:`ctypes`, which has the same size as +the :c:type:`time_t` type in C. + +.. + +.. date: 2022-05-16-14-35-39 +.. gh-issue: 92839 +.. nonce: owSMyo +.. section: Library + +Fixed crash resulting from calling bisect.insort() or bisect.insort_left() +with the key argument not equal to None. + +.. + +.. date: 2022-05-14-11-41-23 +.. gh-issue: 90473 +.. nonce: kPdOZl +.. section: Library + +:mod:`subprocess` now fails early on Emscripten and WASI platforms to work +around missing :func:`os.pipe` on WASI. + +.. + +.. date: 2022-05-14-09-01-38 +.. gh-issue: 89325 +.. nonce: ys-2BZ +.. section: Library + +Removed many old deprecated :mod:`unittest` features: +:class:`~unittest.TestCase` method aliases, undocumented and broken +:class:`~unittest.TestCase` method ``assertDictContainsSubset``, +undocumented :meth:`TestLoader.loadTestsFromModule +<unittest.TestLoader.loadTestsFromModule>` parameter *use_load_tests*, and +an underscored alias of the :class:`~unittest.TextTestResult` class. + +.. + +.. date: 2022-05-12-15-19-00 +.. gh-issue: 92734 +.. nonce: d0wjDt +.. section: Library + +Allow multi-element reprs emitted by :mod:`reprlib` to be pretty-printed +using configurable indentation. + +.. + +.. date: 2022-05-11-19-33-27 +.. gh-issue: 92671 +.. nonce: KE4v6a +.. section: Library + +Fixed :func:`ast.unparse` for empty tuples in the assignment target context. + +.. + +.. date: 2022-05-11-14-34-09 +.. gh-issue: 91581 +.. nonce: glkou2 +.. section: Library + +:meth:`~datetime.datetime.utcfromtimestamp` no longer attempts to resolve +``fold`` in the pure Python implementation, since the fold is never 1 in +UTC. In addition to being slightly faster in the common case, this also +prevents some errors when the timestamp is close to :attr:`datetime.min +<datetime.datetime.min>`. Patch by Paul Ganssle. + +.. + +.. date: 2022-05-11-10-06-31 +.. gh-issue: 86388 +.. nonce: 7ivUtT +.. section: Library + +Removed randrange() functionality deprecated since Python 3.10. Formerly, +randrange(10.0) losslessly converted to randrange(10). Now, it raises a +TypeError. Also, the exception raised for non-integral values such as +randrange(10.5) or randrange('10') has been changed from ValueError to +TypeError. + +.. + +.. date: 2022-05-10-16-30-40 +.. gh-issue: 90385 +.. nonce: 1_wBRQ +.. section: Library + +Add :meth:`pathlib.Path.walk` as an alternative to :func:`os.walk`. + +.. + +.. date: 2022-05-10-07-57-27 +.. gh-issue: 92550 +.. nonce: Rk_UzM +.. section: Library + +Fix :meth:`pathlib.Path.rglob` for empty pattern. + +.. + +.. date: 2022-05-09-22-27-11 +.. gh-issue: 92591 +.. nonce: V7RCk2 +.. section: Library + +Allow :mod:`logging` filters to return a :class:`logging.LogRecord` instance +so that filters attached to :class:`logging.Handler`\ s can enrich records +without side effects on other handlers. + +.. + +.. date: 2022-05-09-21-31-41 +.. gh-issue: 92445 +.. nonce: tJosdm +.. section: Library + +Fix a bug in :mod:`argparse` where ``nargs="*"`` would raise an error +instead of returning an empty list when 0 arguments were supplied if choice +was also defined in ``parser.add_argument``. + +.. + +.. date: 2022-05-09-11-55-04 +.. gh-issue: 92547 +.. nonce: CzVZft +.. section: Library + +Remove undocumented :mod:`sqlite3` features deprecated in Python 3.10: + +* ``sqlite3.enable_shared_cache()`` +* ``sqlite3.OptimizedUnicode`` + +Patch by Erlend E. Aasland. + +.. + +.. date: 2022-05-09-09-28-02 +.. gh-issue: 92530 +.. nonce: M4Q1RS +.. section: Library + +Fix an issue that occurred after interrupting +:func:`threading.Condition.notify`. + +.. + +.. date: 2022-05-09-01-27-25 +.. gh-issue: 92531 +.. nonce: vV7S_O +.. section: Library + +The statistics.median_grouped() function now always return a float. +Formerly, it did not convert the input type when for sequences of length +one. + +.. + +.. date: 2022-05-08-19-21-14 +.. gh-issue: 84131 +.. nonce: rG5kI7 +.. section: Library + +The :class:`pathlib.Path` deprecated method ``link_to`` has been removed. +Use 3.10's :meth:`~pathlib.Path.hardlink_to` method instead as its semantics +are consistent with that of :meth:`~pathlib.Path.symlink_to`. + +.. + +.. date: 2022-05-08-18-51-14 +.. gh-issue: 89336 +.. nonce: TL6ip7 +.. section: Library + +Removed :mod:`configparser` module APIs: the ``SafeConfigParser`` class +alias, the ``ParsingError.filename`` property and parameter, and the +``ConfigParser.readfp`` method, all of which were deprecated since Python +3.2. + +.. + +.. date: 2022-05-06-13-00-57 +.. gh-issue: 92391 +.. nonce: s-Lase +.. section: Library + +Add :meth:`~object.__class_getitem__` to :class:`csv.DictReader` and +:class:`csv.DictWriter`, allowing them to be parameterized at runtime. Patch +by Marc Mueller. + +.. + +.. date: 2022-04-26-18-37-24 +.. gh-issue: 91968 +.. nonce: fuuH1_ +.. section: Library + +Add ``SO_RTABLE`` and ``SO_USER_COOKIE`` constants to :mod:`socket`. + +.. + +.. date: 2022-04-25-10-23-01 +.. gh-issue: 91810 +.. nonce: DOHa6B +.. section: Library + +:class:`~xml.etree.ElementTree.ElementTree` method +:meth:`~xml.etree.ElementTree.ElementTree.write` and function +:func:`~xml.etree.ElementTree.tostring` now use the text file's encoding +("UTF-8" if not available) instead of locale encoding in XML declaration +when ``encoding="unicode"`` is specified. + +.. + +.. date: 2022-04-24-22-26-45 +.. gh-issue: 81790 +.. nonce: M5Rvpm +.. section: Library + +:func:`os.path.splitdrive` now understands DOS device paths with UNC links +(beginning ``\\?\UNC\``). Contributed by Barney Gale. + +.. + +.. date: 2022-04-21-19-14-29 +.. gh-issue: 91760 +.. nonce: 54AR-m +.. section: Library + +Apply more strict rules for numerical group references and group names in +regular expressions. Only sequence of ASCII digits is now accepted as a +numerical reference. The group name in bytes patterns and replacement +strings can now only contain ASCII letters and digits and underscore. + +.. + +.. date: 2022-04-15-22-07-36 +.. gh-issue: 90622 +.. nonce: 0C6l8h +.. section: Library + +Worker processes for :class:`concurrent.futures.ProcessPoolExecutor` are no +longer spawned on demand (a feature added in 3.9) when the multiprocessing +context start method is ``"fork"`` as that can lead to deadlocks in the +child processes due to a fork happening while threads are running. + +.. + +.. date: 2022-04-15-17-38-55 +.. gh-issue: 91577 +.. nonce: Ah7cLL +.. section: Library + +Move imports in :class:`~multiprocessing.SharedMemory` methods to module +level so that they can be executed late in python finalization. + +.. + +.. date: 2022-04-15-13-16-25 +.. gh-issue: 91581 +.. nonce: 9OGsrN +.. section: Library + +Remove an unhandled error case in the C implementation of calls to +:meth:`datetime.fromtimestamp <datetime.datetime.fromtimestamp>` with no +time zone (i.e. getting a local time from an epoch timestamp). This should +have no user-facing effect other than giving a possibly more accurate error +message when called with timestamps that fall on 10000-01-01 in the local +time. Patch by Paul Ganssle. + +.. + +.. date: 2022-04-15-11-29-38 +.. gh-issue: 91539 +.. nonce: 7WgVuA +.. section: Library + +Improve performance of ``urllib.request.getproxies_environment`` when there +are many environment variables + +.. + +.. date: 2022-04-14-08-37-16 +.. gh-issue: 91524 +.. nonce: g8PiIu +.. section: Library + +Speed up the regular expression substitution (functions :func:`re.sub` and +:func:`re.subn` and corresponding :class:`re.Pattern` methods) for +replacement strings containing group references by 2--3 times. + +.. + +.. date: 2022-04-12-18-05-40 +.. gh-issue: 91447 +.. nonce: N_Fs4H +.. section: Library + +Fix findtext in the xml module to only give an empty string when the text +attribute is set to None. + +.. + +.. date: 2022-04-11-16-55-41 +.. gh-issue: 91456 +.. nonce: DK3KKl +.. section: Library + +Deprecate current default auto() behavior: In 3.13 the default will be for +for auto() to always return the largest member value incremented by 1, and +to raise if incompatible value types are used. + +.. + +.. bpo: 47231 +.. date: 2022-04-08-22-12-11 +.. nonce: lvyglt +.. section: Library + +Fixed an issue with inconsistent trailing slashes in tarfile longname +directories. + +.. + +.. bpo: 39064 +.. date: 2022-04-03-19-40-09 +.. nonce: 76PbIz +.. section: Library + +:class:`zipfile.ZipFile` now raises :exc:`zipfile.BadZipFile` instead of +``ValueError`` when reading a corrupt zip file in which the central +directory offset is negative. + +.. + +.. bpo: 41287 +.. date: 2022-04-03-11-25-02 +.. nonce: 8CTdwf +.. section: Library + +Fix handling of the ``doc`` argument in subclasses of :func:`property`. + +.. + +.. date: 2022-04-01-12-35-44 +.. gh-issue: 90005 +.. nonce: pvaLHQ +.. section: Library + +:mod:`ctypes` dependency ``libffi`` is now detected with ``pkg-config``. + +.. + +.. bpo: 32547 +.. date: 2022-04-01-09-43-54 +.. nonce: NIUiNC +.. section: Library + +The constructors for :class:`~csv.DictWriter` and :class:`~csv.DictReader` +now coerce the ``fieldnames`` argument to a :class:`list` if it is an +iterator. + +.. + +.. bpo: 35540 +.. date: 2022-03-22-18-28-55 +.. nonce: nyijX9 +.. section: Library + +Fix :func:`dataclasses.asdict` crash when :class:`collections.defaultdict` +is present in the attributes. + +.. + +.. bpo: 47063 +.. date: 2022-03-19-04-41-42 +.. nonce: nwRfUo +.. section: Library + +Add an index_pages parameter to support using non-default index page names. + +.. + +.. bpo: 47025 +.. date: 2022-03-16-14-24-14 +.. nonce: qtT3CE +.. section: Library + +Drop support for :class:`bytes` on :attr:`sys.path`. + +.. + +.. bpo: 46951 +.. date: 2022-03-08-04-46-44 +.. nonce: SWAz97 +.. section: Library + +Order the contents of zipapp archives, to make builds more reproducible. + +.. + +.. bpo: 42777 +.. date: 2022-02-21-01-37-00 +.. nonce: nWK3E6 +.. section: Library + +Implement :meth:`pathlib.Path.is_mount` for Windows paths. + +.. + +.. bpo: 46755 +.. date: 2022-02-15-12-40-48 +.. nonce: zePJfx +.. section: Library + +In :class:`QueueHandler`, clear ``stack_info`` from :class:`LogRecord` to +prevent stack trace from being written twice. + +.. + +.. bpo: 45393 +.. date: 2022-02-09-23-44-27 +.. nonce: 9v5Y8U +.. section: Library + +Fix the formatting for ``await x`` and ``not x`` in the operator precedence +table when using the :func:`help` system. + +.. + +.. bpo: 46642 +.. date: 2022-02-05-18-46-54 +.. nonce: YI6nHQ +.. section: Library + +Improve error message when trying to subclass an instance of +:data:`typing.TypeVar`, :data:`typing.ParamSpec`, +:data:`typing.TypeVarTuple`, etc. Based on patch by Gregory Beauregard. + +.. + +.. bpo: 46364 +.. date: 2022-01-14-10-49-20 +.. nonce: SzhlU9 +.. section: Library + +Restrict use of sockets instead of pipes for stdin of subprocesses created +by :mod:`asyncio` to AIX platform only. + +.. + +.. bpo: 28249 +.. date: 2022-01-09-14-23-00 +.. nonce: 4dzB80 +.. section: Library + +Set :attr:`doctest.DocTest.lineno` to ``None`` when object does not have +:attr:`__doc__`. + +.. + +.. bpo: 46197 +.. date: 2022-01-03-15-07-06 +.. nonce: Z0djv6 +.. section: Library + +Fix :mod:`ensurepip` environment isolation for subprocess running ``pip``. + +.. + +.. bpo: 45924 +.. date: 2021-12-27-15-32-15 +.. nonce: 0ZpHX2 +.. section: Library + +Fix :mod:`asyncio` incorrect traceback when future's exception is raised +multiple times. Patch by Kumar Aditya. + +.. + +.. bpo: 45046 +.. date: 2021-08-29-19-59-16 +.. nonce: eGq0NC +.. section: Library + +Add support of context managers in :mod:`unittest`: methods +:meth:`~unittest.TestCase.enterContext` and +:meth:`~unittest.TestCase.enterClassContext` of class +:class:`~unittest.TestCase`, method +:meth:`~unittest.IsolatedAsyncioTestCase.enterAsyncContext` of class +:class:`~unittest.IsolatedAsyncioTestCase` and function +:func:`unittest.enterModuleContext`. + +.. + +.. bpo: 44173 +.. date: 2021-08-27-18-07-35 +.. nonce: oW92Ev +.. section: Library + +Enable fast seeking of uncompressed unencrypted :class:`zipfile.ZipExtFile` + +.. + +.. bpo: 42627 +.. date: 2021-05-22-07-58-59 +.. nonce: EejtD0 +.. section: Library + +Fix incorrect parsing of Windows registry proxy settings + +.. + +.. bpo: 42047 +.. date: 2020-10-15-18-37-12 +.. nonce: XDdoSF +.. section: Library + +Add :func:`threading.get_native_id` support for DragonFly BSD. Patch by +David Carlier. + +.. + +.. bpo: 14243 +.. date: 2020-09-28-04-56-04 +.. nonce: YECnxv +.. section: Library + +The :class:`tempfile.NamedTemporaryFile` function has a new optional +parameter *delete_on_close* + +.. + +.. bpo: 41246 +.. date: 2020-07-08-20-32-13 +.. nonce: 2trYf3 +.. section: Library + +Give the same callback function for when the overlapped operation is done to +the functions ``recv``, ``recv_into``, ``recvfrom``, ``sendto``, ``send`` +and ``sendfile`` inside ``IocpProactor``. + +.. + +.. bpo: 39264 +.. date: 2020-01-09-01-57-12 +.. nonce: GsBL9- +.. section: Library + +Fixed :meth:`collections.UserDict.get` to not call :meth:`__missing__` when +a value is not found. This matches the behavior of :class:`dict`. Patch by +Bar Harel. + +.. + +.. bpo: 38693 +.. date: 2019-11-04-22-21-27 +.. nonce: w_OAov +.. section: Library + +:mod:`importlib` now uses f-strings internally instead of ``str.format``. + +.. + +.. bpo: 38267 +.. date: 2019-09-25-00-37-51 +.. nonce: X9Jb5V +.. section: Library + +Add *timeout* parameter to :meth:`asyncio.loop.shutdown_default_executor`. +The default value is ``None``, which means the executor will be given an +unlimited amount of time. When called from :class:`asyncio.Runner` or +:func:`asyncio.run`, the default timeout is 5 minutes. + +.. + +.. bpo: 34828 +.. date: 2018-09-28-22-18-03 +.. nonce: 5Zyi_S +.. section: Library + +:meth:`sqlite3.Connection.iterdump` now handles databases that use +``AUTOINCREMENT`` in one or more tables. + +.. + +.. bpo: 32990 +.. date: 2018-09-23-07-47-29 +.. nonce: 2FVVTU +.. section: Library + +Support reading wave files with the ``WAVE_FORMAT_EXTENSIBLE`` format in the +:mod:`wave` module. + +.. + +.. bpo: 26253 +.. date: 2017-07-31-13-35-28 +.. nonce: 8v_sCs +.. section: Library + +Allow adjustable compression level for tarfile streams in +:func:`tarfile.open`. + +.. + +.. date: 2022-10-16-17-34-45 +.. gh-issue: 85525 +.. nonce: DvkD0v +.. section: Documentation + +Remove extra row + +.. + +.. date: 2022-10-11-09-40-50 +.. gh-issue: 86404 +.. nonce: dEAb8W +.. section: Documentation + +Deprecated tools ``make suspicious`` and ``rstlint.py`` are now removed. +They have been replaced by `spinx-lint +<https://pypi.org/project/sphinx-lint/>`_. + +.. + +.. date: 2022-10-02-10-58-52 +.. gh-issue: 97741 +.. nonce: 39l023 +.. section: Documentation + +Fix ``!`` in c domain ref target syntax via a ``conf.py`` patch, so it works +as intended to disable ref target resolution. + +.. + +.. date: 2022-09-01-17-03-04 +.. gh-issue: 96432 +.. nonce: 1EJ1-4 +.. section: Documentation + +Fraction literals now support whitespace around the forward slash, +``Fraction('2 / 3')``. + +.. + +.. date: 2022-08-19-17-07-45 +.. gh-issue: 96098 +.. nonce: nDp43u +.. section: Documentation + +Improve discoverability of the higher level concurrent.futures module by +providing clearer links from the lower level threading and multiprocessing +modules. + +.. + +.. date: 2022-08-13-20-34-51 +.. gh-issue: 95957 +.. nonce: W9ZZAx +.. section: Documentation + +What's New 3.11 now has instructions for how to provide compiler and linker +flags for Tcl/Tk and OpenSSL on RHEL 7 and CentOS 7. + +.. + +.. date: 2022-08-12-01-12-52 +.. gh-issue: 95588 +.. nonce: PA0FI7 +.. section: Documentation + +Clarified the conflicting advice given in the :mod:`ast` documentation about +:func:`ast.literal_eval` being "safe" for use on untrusted input while at +the same time warning that it can crash the process. The latter statement is +true and is deemed unfixable without a large amount of work unsuitable for a +bugfix. So we keep the warning and no longer claim that ``literal_eval`` is +safe. + +.. + +.. date: 2022-08-03-13-35-08 +.. gh-issue: 91207 +.. nonce: eJ4pPf +.. section: Documentation + +Fix stylesheet not working in Windows CHM htmlhelp docs and add warning that +they are deprecated. Contributed by C.A.M. Gerlach. + +.. + +.. date: 2022-07-30-00-23-11 +.. gh-issue: 95454 +.. nonce: we7AFm +.. section: Documentation + +Replaced incorrectly written true/false values in documentiation. Patch by +Robert O'Shea + +.. + +.. date: 2022-07-29-23-02-19 +.. gh-issue: 95451 +.. nonce: -tgB93 +.. section: Documentation + +Update library documentation with :ref:`availability information +<wasm-availability>` on WebAssembly platforms ``wasm32-emscripten`` and +``wasm32-wasi``. + +.. + +.. date: 2022-07-29-09-04-02 +.. gh-issue: 95415 +.. nonce: LKTyw6 +.. section: Documentation + +Use consistent syntax for platform availability. The directive now supports +a content body and emits a warning when it encounters an unknown platform. + +.. + +.. date: 2022-07-07-08-42-05 +.. gh-issue: 94321 +.. nonce: pmCIPb +.. section: Documentation + +Document the :pep:`246` style protocol type +:class:`sqlite3.PrepareProtocol`. + +.. + +.. date: 2022-06-19-18-18-22 +.. gh-issue: 86128 +.. nonce: 39DDTD +.. section: Documentation + +Document a limitation in ThreadPoolExecutor where its exit handler is +executed before any handlers in atexit. + +.. + +.. date: 2022-06-16-10-10-59 +.. gh-issue: 61162 +.. nonce: 1ypkG8 +.. section: Documentation + +Clarify :mod:`sqlite3` behavior when +:ref:`sqlite3-connection-context-manager`. + +.. + +.. date: 2022-06-15-12-12-49 +.. gh-issue: 87260 +.. nonce: epyI7D +.. section: Documentation + +Align :mod:`sqlite3` argument specs with the actual implementation. + +.. + +.. date: 2022-05-29-21-22-54 +.. gh-issue: 86986 +.. nonce: lFXw8j +.. section: Documentation + +The minimum Sphinx version required to build the documentation is now 3.2. + +.. + +.. date: 2022-05-26-14-51-25 +.. gh-issue: 88831 +.. nonce: 5Cccr5 +.. section: Documentation + +Augmented documentation of asyncio.create_task(). Clarified the need to keep +strong references to tasks and added a code snippet detailing how to to +this. + +.. + +.. date: 2022-05-26-11-33-23 +.. gh-issue: 86438 +.. nonce: kEGGmK +.. section: Documentation + +Clarify that :option:`-W` and :envvar:`PYTHONWARNINGS` are matched literally +and case-insensitively, rather than as regular expressions, in +:mod:`warnings`. + +.. + +.. date: 2022-05-20-18-42-10 +.. gh-issue: 93031 +.. nonce: c2RdJe +.. section: Documentation + +Update tutorial introduction output to use 3.10+ SyntaxError invalid range. + +.. + +.. date: 2022-05-18-23-58-26 +.. gh-issue: 92240 +.. nonce: bHvYiz +.. section: Documentation + +Added release dates for "What's New in Python 3.X" for 3.0, 3.1, 3.2, 3.8 +and 3.10 + +.. + +.. bpo: 47161 +.. date: 2022-03-30-17-56-01 +.. nonce: gesHfS +.. section: Documentation + +Document that :class:`pathlib.PurePath` does not collapse initial double +slashes because they denote UNC paths. + +.. + +.. bpo: 40838 +.. date: 2022-01-13-16-03-15 +.. nonce: k3NVCf +.. section: Documentation + +Document that :func:`inspect.getdoc`, :func:`inspect.getmodule`, and +:func:`inspect.getsourcefile` might return ``None``. + +.. + +.. bpo: 43689 +.. date: 2021-04-01-08-09-34 +.. nonce: mqCfLe +.. section: Documentation + +The ``Differ`` documentation now also mentions other whitespace characters, +which make it harder to understand the diff output. + +.. + +.. bpo: 38056 +.. date: 2019-09-12-08-28-17 +.. nonce: 6ktYkc +.. section: Documentation + +Overhaul the :ref:`error-handlers` documentation in :mod:`codecs`. + +.. + +.. bpo: 13553 +.. date: 2017-12-10-19-13-39 +.. nonce: gQbZs4 +.. section: Documentation + +Document tkinter.Tk args. + +.. + +.. date: 2022-10-20-17-49-50 +.. gh-issue: 95027 +.. nonce: viRpJB +.. section: Tests + +On Windows, when the Python test suite is run with the ``-jN`` option, the +ANSI code page is now used as the encoding for the stdout temporary file, +rather than using UTF-8 which can lead to decoding errors. Patch by Victor +Stinner. + +.. + +.. date: 2022-09-08-18-31-26 +.. gh-issue: 96624 +.. nonce: 5cANM1 +.. section: Tests + +Fixed the failure of repeated runs of ``test.test_unittest`` caused by side +effects in ``test_dotted_but_module_not_loaded``. + +.. + +.. date: 2022-08-22-14-59-42 +.. gh-issue: 95243 +.. nonce: DeD66V +.. section: Tests + +Mitigate the inherent race condition from using find_unused_port() in +testSockName() by trying to find an unused port a few times before failing. +Patch by Ross Burton. + +.. + +.. date: 2022-08-05-09-57-43 +.. gh-issue: 95573 +.. nonce: edMdQB +.. section: Tests + +:source:`Lib/test/test_asyncio/test_ssl.py` exposed a bug in the macOS +kernel where intense concurrent load on non-blocking sockets occasionally +causes :const:`errno.ENOBUFS` ("No buffer space available") to be emitted. +FB11063974 filed with Apple, in the mean time as a workaround buffer size +used in tests on macOS is decreased to avoid intermittent failures. Patch +by Fantix King. + +.. + +.. date: 2022-07-26-15-22-19 +.. gh-issue: 95280 +.. nonce: h8HvbP +.. section: Tests + +Fix problem with ``test_ssl`` ``test_get_ciphers`` on systems that require +perfect forward secrecy (PFS) ciphers. + +.. + +.. date: 2022-07-24-20-19-05 +.. gh-issue: 95212 +.. nonce: fHiU4e +.. section: Tests + +Make multiprocessing test case ``test_shared_memory_recreate`` +parallel-safe. + +.. + +.. date: 2022-07-24-17-24-42 +.. gh-issue: 95218 +.. nonce: zfBLtu +.. section: Tests + +Move tests for importlib.resources into test_importlib.resources. + +.. + +.. date: 2022-07-24-16-28-31 +.. gh-issue: 93963 +.. nonce: UB9azu +.. section: Tests + +Updated tests to use preferred location for ``importlib.resources`` ABCs. + +.. + +.. date: 2022-07-08-12-22-00 +.. gh-issue: 94675 +.. nonce: IiTs5f +.. section: Tests + +Add a regression test for :mod:`re` exponentional slowdown when using +rjsmin. + +.. + +.. date: 2022-07-05-17-53-13 +.. gh-issue: 91330 +.. nonce: Qys5IL +.. section: Tests + +Added more tests for :mod:`dataclasses` to cover behavior with data +descriptor-based fields. + +.. + +.. date: 2022-06-27-21-27-20 +.. gh-issue: 94208 +.. nonce: VR6HX- +.. section: Tests + +``test_ssl`` is now checking for supported TLS version and protocols in more +tests. + +.. + +.. date: 2022-06-27-08-53-40 +.. gh-issue: 94315 +.. nonce: MoZT9t +.. section: Tests + +Tests now check for DAC override capability instead of relying on +:func:`os.geteuid`. + +.. + +.. date: 2022-06-21-17-37-46 +.. gh-issue: 54781 +.. nonce: BjVAVg +.. section: Tests + +Rename test_tk to test_tkinter, and rename test_ttk_guionly to test_ttk. +Patch by Victor Stinner. + +.. + +.. date: 2022-06-20-23-04-52 +.. gh-issue: 93839 +.. nonce: OE3Ybk +.. section: Tests + +Move ``Lib/ctypes/test/`` to ``Lib/test/test_ctypes/``. Patch by Victor +Stinner. + +.. + +.. date: 2022-06-17-15-20-09 +.. gh-issue: 93951 +.. nonce: CW1Vv4 +.. section: Tests + +In test_bdb.StateTestCase.test_skip, avoid including auxiliary importers. + +.. + +.. date: 2022-06-17-13-55-11 +.. gh-issue: 93957 +.. nonce: X4ovYV +.. section: Tests + +Provide nicer error reporting from subprocesses in +test_venv.EnsurePipTest.test_with_pip. + +.. + +.. date: 2022-06-17-13-27-21 +.. gh-issue: 93884 +.. nonce: 5pvPvl +.. section: Tests + +Add test cases for :c:func:`PyNumber_ToBase` that take a large number or a +non-int object as parameter. + +.. + +.. date: 2022-06-16-21-38-18 +.. gh-issue: 93852 +.. nonce: U_Hl6s +.. section: Tests + +test_asyncio, test_logging, test_socket and test_socketserver now create +AF_UNIX domains in the current directory to no longer fail with +``OSError("AF_UNIX path too long")`` if the temporary directory (the +:envvar:`TMPDIR` environment variable) is too long. Patch by Victor Stinner. + +.. + +.. date: 2022-06-16-17-50-58 +.. gh-issue: 93353 +.. nonce: JdpATx +.. section: Tests + +regrtest now checks if a test leaks temporary files or directories if run +with -jN option. Patch by Victor Stinner. + +.. + +.. date: 2022-06-10-21-18-14 +.. gh-issue: 84461 +.. nonce: 9TAb26 +.. section: Tests + +``run_tests.py`` now handles cross compiling env vars correctly and pass +``HOSTRUNNER`` to regression tests. + +.. + +.. date: 2022-06-08-22-32-56 +.. gh-issue: 93616 +.. nonce: e5Kkx2 +.. section: Tests + +``test_modulefinder`` now creates a temporary directory in +``ModuleFinderTest.setUp()`` instead of module scope. + +.. + +.. date: 2022-06-08-14-17-59 +.. gh-issue: 93575 +.. nonce: Xb2LNB +.. section: Tests + +Fix issue with test_unicode test_raiseMemError. The test case now use +``test.support.calcobjsize`` to calculate size of PyUnicode structs. +:func:`sys.getsizeof` may return different size when string has UTF-8 +memory. + +.. + +.. date: 2022-06-05-10-16-45 +.. gh-issue: 90473 +.. nonce: QMu7A8 +.. section: Tests + +WASI does not have a ``chmod(2)`` syscall. :func:`os.chmod` is now a dummy +function on WASI. Skip all tests that depend on working :func:`os.chmod`. + +.. + +.. date: 2022-06-04-12-05-31 +.. gh-issue: 90473 +.. nonce: RSpjF7 +.. section: Tests + +Skip tests on WASI that require symlinks with absolute paths. + +.. + +.. date: 2022-06-03-16-26-04 +.. gh-issue: 57539 +.. nonce: HxWgYO +.. section: Tests + +Increase calendar test coverage for +:meth:`calendar.LocaleTextCalendar.formatweekday`. + +.. + +.. date: 2022-06-03-14-18-37 +.. gh-issue: 90473 +.. nonce: 7iXVRK +.. section: Tests + +Skip symlink tests on WASI. wasmtime uses ``openat2(2)`` with +``RESOLVE_BENEATH`` flag, which prevents symlinks with absolute paths. + +.. + +.. date: 2022-06-03-12-22-44 +.. gh-issue: 89858 +.. nonce: ftBvjE +.. section: Tests + +Fix ``test_embed`` for out-of-tree builds. Patch by Kumar Aditya. + +.. + +.. date: 2022-05-25-23-07-15 +.. gh-issue: 92886 +.. nonce: Aki63_ +.. section: Tests + +Fixing tests that fail when running with optimizations (``-O``) in +``test_imaplib.py``. + +.. + +.. date: 2022-05-25-23-00-35 +.. gh-issue: 92886 +.. nonce: Y-vrWj +.. section: Tests + +Fixing tests that fail when running with optimizations (``-O``) in +``test_zipimport.py`` + +.. + +.. date: 2022-05-25-22-53-30 +.. gh-issue: 92886 +.. nonce: mIfdtz +.. section: Tests + +Fixing tests that fail when running with optimizations (``-O``) in +``test_py_compile.py`` + +.. + +.. date: 2022-05-25-22-43-11 +.. gh-issue: 92886 +.. nonce: 9HQb9e +.. section: Tests + +Fixing tests that fail when running with optimizations (``-O``) in +``test_sys_settrace.py``. + +.. + +.. date: 2022-05-25-22-34-10 +.. gh-issue: 92886 +.. nonce: 1Lkt8S +.. section: Tests + +Fixing tests that fail when running with optimizations (``-O``) in +``_test_multiprocessing.py`` + +.. + +.. date: 2022-05-12-05-51-06 +.. gh-issue: 92670 +.. nonce: 7L43Z_ +.. section: Tests + +Skip ``test_shutil.TestCopy.test_copyfile_nonexistent_dir`` test on AIX as +the test uses a trailing slash to force the OS consider the path as a +directory, but on AIX the trailing slash has no effect and is considered as +a file. + +.. + +.. date: 2022-05-08-15-40-41 +.. gh-issue: 92514 +.. nonce: Xbf5JY +.. section: Tests + +Remove unused ``test.support.BasicTestRunner``. Patch by Jelle Zijlstra. + +.. + +.. bpo: 47016 +.. date: 2022-03-14-23-28-17 +.. nonce: K-t2QX +.. section: Tests + +Create a GitHub Actions workflow for verifying bundled pip and setuptools. +Patch by Illia Volochii and Adam Turner. + +.. + +.. date: 2022-09-20-12-43-44 +.. gh-issue: 96761 +.. nonce: IF29kR +.. section: Build + +Fix the build process of clang compiler for :program:`_bootstrap_python` if +LTO optimization is applied. Patch by Matthias Görgens and Dong-hee Na. + +.. + +.. date: 2022-09-17-11-19-24 +.. gh-issue: 96883 +.. nonce: p_gr62 +.. section: Build + +``wasm32-emscripten`` builds for browsers now include +:mod:`concurrent.futures` for :mod:`asyncio` and :mod:`unittest.mock`. + +.. + +.. date: 2022-09-12-18-34-51 +.. gh-issue: 85936 +.. nonce: tX4VCU +.. section: Build + +CPython now uses the ThinLTO option as the default policy if the Clang +compiler accepts the flag. Patch by Dong-hee Na. + +.. + +.. date: 2022-09-11-14-23-49 +.. gh-issue: 96729 +.. nonce: W4uBWL +.. section: Build + +Ensure that Windows releases built with ``Tools\msi\buildrelease.bat`` are +upgradable to and from official Python releases. + +.. + +.. date: 2022-08-26-11-50-03 +.. gh-issue: 96269 +.. nonce: x_J5h0 +.. section: Build + +Shared module targets now depend on new ``MODULE_DEPS`` variable, which +includes ``EXPORTSYMS``. This fixes a build order issue on unsupported AIX +platform. + +.. + +.. date: 2022-08-26-11-09-11 +.. gh-issue: 84461 +.. nonce: Nsdn_R +.. section: Build + +``wasm32-emscripten`` platform no longer builds :mod:`resource` module, +:func:`~os.getresuid`, :func:`~os.getresgid`, and their setters. The APIs +are stubs and not functional. + +.. + +.. date: 2022-08-15-10-56-07 +.. gh-issue: 95973 +.. nonce: Bsswsc +.. section: Build + +Add a new ``--with-dsymutil`` configure option to to link debug information +in macOS. Patch by Pablo Galindo. + +.. + +.. date: 2022-08-12-13-06-03 +.. gh-issue: 90536 +.. nonce: qMpF6p +.. section: Build + +Use the BOLT post-link optimizer to improve performance, particularly on +medium-to-large applications. + +.. + +.. date: 2022-08-04-15-29-35 +.. gh-issue: 93744 +.. nonce: svRuqm +.. section: Build + +Remove the ``configure --with-cxx-main`` build option: it didn't work for +many years. Remove the ``MAINCC`` variable from ``configure`` and +``Makefile``. Patch by Victor Stinner. + +.. + +.. date: 2022-07-26-18-13-34 +.. gh-issue: 94801 +.. nonce: 9fREfy +.. section: Build + +Fix a regression in ``configure`` script that caused some header checks to +ignore custom ``CPPFLAGS``. The regression was introduced in :gh:`94802`. + +.. + +.. date: 2022-07-25-09-48-43 +.. gh-issue: 95145 +.. nonce: ZNS3dj +.. section: Build + +wasm32-wasi builds no longer depend on WASIX's pthread stubs. Python now has +its own stubbed pthread API. + +.. + +.. date: 2022-07-25-08-59-35 +.. gh-issue: 95174 +.. nonce: g8woUW +.. section: Build + +Python now detects missing ``dup`` function in WASI and works around some +missing :mod:`errno`, :mod:`select`, and :mod:`socket` constants. + +.. + +.. date: 2022-07-23-21-39-09 +.. gh-issue: 95174 +.. nonce: 7cYMZR +.. section: Build + +Python now skips missing :mod:`socket` functions and methods on WASI. WASI +can only create sockets from existing fd / accept and has no netdb. + +.. + +.. date: 2022-07-21-09-17-01 +.. gh-issue: 95085 +.. nonce: E9x2S_ +.. section: Build + +Platforms ``wasm32-unknown-emscripten`` and ``wasm32-unknown-wasi`` have +been promoted to :pep:`11` tier 3 platform support. + +.. + +.. date: 2022-07-14-11-13-26 +.. gh-issue: 94847 +.. nonce: s3Kr5p +.. section: Build + +Fixed ``_decimal`` module build issue on GCC when compiling with LTO and +pydebug. Debug builds no longer force inlining of functions. + +.. + +.. date: 2022-07-14-02-45-44 +.. gh-issue: 94841 +.. nonce: lLRTdf +.. section: Build + +Fix the possible performance regression of :c:func:`PyObject_Free` compiled +with MSVC version 1932. + +.. + +.. date: 2022-07-13-10-13-10 +.. gh-issue: 94801 +.. nonce: 3xUB24 +.. section: Build + +``configure`` now uses custom flags like ``ZLIB_CFLAGS`` and ``ZLIB_LIBS`` +when searching for headers and libraries. + +.. + +.. date: 2022-07-12-13-39-18 +.. gh-issue: 94773 +.. nonce: koHKm5 +.. section: Build + +``deepfreeze.py`` now supports code object with frozensets that contain +incompatible, unsortable types. + +.. + +.. date: 2022-07-08-10-28-23 +.. gh-issue: 94682 +.. nonce: ZtGt_0 +.. section: Build + +Build and test with OpenSSL 1.1.1q + +.. + +.. date: 2022-06-30-17-18-23 +.. gh-issue: 90005 +.. nonce: EIOOla +.. section: Build + +Dependencies of :mod:`readline` and :mod:`curses` module are now detected in +``configure`` script with ``pkg-config``. Only ``ncurses`` / ``ncursesw`` +are detected automatically. The old ``curses`` library is not configured +automatically. Workaround for missing ``termcap`` or ``tinfo`` library has +been removed. + +.. + +.. date: 2022-06-30-17-00-54 +.. gh-issue: 90005 +.. nonce: iiq5qD +.. section: Build + +Fix building ``_ctypes`` extension without ``pkg-config``. + +.. + +.. date: 2022-06-30-09-57-39 +.. gh-issue: 90005 +.. nonce: 9-pQyR +.. section: Build + +``_dbm`` module dependencies are now detected by configure. + +.. + +.. date: 2022-06-29-08-58-31 +.. gh-issue: 94404 +.. nonce: 3MadM6 +.. section: Build + +``makesetup`` now works around an issue with sed on macOS and uses correct +CFLAGS for object files that end up in a shared extension. Module CFLAGS are +used before PY_STDMODULE_CFLAGS to avoid clashes with system headers. + +.. + +.. date: 2022-06-28-09-42-10 +.. gh-issue: 93939 +.. nonce: _VWxKW +.. section: Build + +C extension modules are now built by ``configure`` and ``make`` instead of +``distutils`` and ``setup.py``. + +.. + +.. date: 2022-06-27-11-57-15 +.. gh-issue: 93939 +.. nonce: rv7s8W +.. section: Build + +The ``2to3``, ``idle``, and ``pydoc`` scripts are now generated and +installed by ``Makefile`` instead of ``setup.py``. + +.. + +.. date: 2022-06-25-23-25-47 +.. gh-issue: 94280 +.. nonce: YhEyW_ +.. section: Build + +Updated pegen regeneration script on Windows to find and use Python 3.9 or +higher. Prior to this, pegen regeneration already required 3.9 or higher, +but the script may have used lower versions of Python. + +.. + +.. date: 2022-06-08-14-28-03 +.. gh-issue: 93584 +.. nonce: 0xfHOK +.. section: Build + +Address race condition in ``Makefile`` when installing a PGO build. All +``test`` and ``install`` targets now depend on ``all`` target. + +.. + +.. date: 2022-06-04-12-53-53 +.. gh-issue: 93491 +.. nonce: ehM211 +.. section: Build + +``configure`` now detects and reports :pep:`11` support tiers. + +.. + +.. date: 2022-05-31-18-04-58 +.. gh-issue: 69093 +.. nonce: 6lSa0C +.. section: Build + +Fix ``Modules/Setup.stdlib.in`` rule for ``_sqlite3`` extension. + +.. + +.. date: 2022-05-25-13-56-00 +.. gh-issue: 93207 +.. nonce: B9Rubf +.. section: Build + +``va_start()`` with two parameters, like ``va_start(args, format),`` is now +required to build Python. ``va_start()`` is no longer called with a single +parameter. Patch by Kumar Aditya. + +.. + +.. date: 2022-05-25-05-46-00 +.. gh-issue: 93202 +.. nonce: T37jtj +.. section: Build + +Python now always use the ``%zu`` and ``%zd`` printf formats to format a +``size_t`` or ``Py_ssize_t`` number. Building Python 3.12 requires a C11 +compiler, so these printf formats are now always supported. Patch by Victor +Stinner. + +.. + +.. date: 2022-05-12-10-19-15 +.. gh-issue: 90473 +.. nonce: -syvqK +.. section: Build + +Disable pymalloc and increase stack size on ``wasm32-wasi``. + +.. + +.. bpo: 34449 +.. date: 2018-08-21-11-10-18 +.. nonce: Z3qm3c +.. section: Build + +Drop invalid compiler switch ``-fPIC`` for HP aCC on HP-UX. Patch by Michael +Osipov. + +.. + +.. date: 2022-10-19-20-00-28 +.. gh-issue: 98360 +.. nonce: O2m6YG +.. section: Windows + +Fixes :mod:`multiprocessing` spawning child processes on Windows from a +virtual environment to ensure that child processes that also use +:mod:`multiprocessing` to spawn more children will recognize that they are +in a virtual environment. + +.. + +.. date: 2022-10-19-19-35-37 +.. gh-issue: 98414 +.. nonce: FbHZuS +.. section: Windows + +Fix :file:`py.exe` launcher handling of ``-V:<company>/`` option when +default preferences have been set in environment variables or configuration +files. + +.. + +.. date: 2022-10-02-11-59-23 +.. gh-issue: 97728 +.. nonce: dIdlPE +.. section: Windows + +Fix possible crashes caused by the use of uninitialized variables when pass +invalid arguments in :func:`os.system` on Windows and in Windows-specific +modules (like ``winreg``). + +.. + +.. date: 2022-09-29-23-08-49 +.. gh-issue: 90989 +.. nonce: no89Q2 +.. section: Windows + +Made :ref:`launcher` install per-user by default (unless an all users +install already exists), and clarify some text in the installer. + +.. + +.. date: 2022-09-29-22-27-04 +.. gh-issue: 97649 +.. nonce: bI7OQU +.. section: Windows + +The ``Tools`` directory is no longer installed on Windows + +.. + +.. date: 2022-09-23-15-40-04 +.. gh-issue: 96965 +.. nonce: CsnEGs +.. section: Windows + +Update libffi to 3.4.3 + +.. + +.. date: 2022-09-07-00-11-33 +.. gh-issue: 96577 +.. nonce: kV4K_1 +.. section: Windows + +Fixes a potential buffer overrun in :mod:`msilib`. + +.. + +.. date: 2022-09-05-18-32-47 +.. gh-issue: 96559 +.. nonce: 561sUd +.. section: Windows + +Fixes the Windows launcher not using the compatible interpretation of +default tags found in configuration files when no tag was passed to the +command. + +.. + +.. date: 2022-08-30-12-01-51 +.. gh-issue: 94781 +.. nonce: OxO-Gr +.. section: Windows + +Fix :file:`pcbuild.proj` to clean previous instances of output files in +``Python\deepfreeze`` and ``Python\frozen_modules`` directories on Windows. +Patch by Charlie Zhao. + +.. + +.. date: 2022-08-26-00-11-18 +.. gh-issue: 89545 +.. nonce: zmJMY_ +.. section: Windows + +Updates :mod:`platform` code getting the Windows version to use native +Windows Management Instrumentation (WMI) queries to determine OS version, +type, and architecture. + +.. + +.. date: 2022-08-10-22-46-48 +.. gh-issue: 95733 +.. nonce: 2_urOp +.. section: Windows + +Make certain requirements of the Windows Store package optional to allow +installing on earlier updates of Windows. + +.. + +.. date: 2022-08-04-18-47-54 +.. gh-issue: 95656 +.. nonce: VJ1d13 +.. section: Windows + +Enable the :meth:`~sqlite3.Connection.enable_load_extension` :mod:`sqlite3` +API. + +.. + +.. date: 2022-08-04-01-12-27 +.. gh-issue: 95587 +.. nonce: Fvdv5q +.. section: Windows + +Fixes some issues where the Windows installer would incorrectly detect +certain features of an existing install when upgrading. + +.. + +.. date: 2022-08-03-00-49-46 +.. gh-issue: 94399 +.. nonce: KvxHc0 +.. section: Windows + +Restores the behaviour of :ref:`launcher` for ``/usr/bin/env`` shebang +lines, which will now search :envvar:`PATH` for an executable matching the +given command. If none is found, the usual search process is used. + +.. + +.. date: 2022-07-30-14-18-33 +.. gh-issue: 95445 +.. nonce: mjrTaq +.. section: Windows + +Fixes the unsuccessful removal of the HTML document directory when +uninstalling with Windows msi. + +.. + +.. date: 2022-07-28-20-21-38 +.. gh-issue: 95359 +.. nonce: ywMrgu +.. section: Windows + +Fix :ref:`launcher` handling of :file:`py.ini` commands (it was incorrectly +expecting a ``py_`` prefix on keys) and crashes when reading per-user +configuration file. + +.. + +.. date: 2022-07-26-20-33-12 +.. gh-issue: 95285 +.. nonce: w6fa22 +.. section: Windows + +Fix :ref:`launcher` handling of command lines where it is only passed a +short executable name. + +.. + +.. date: 2022-07-16-16-18-32 +.. gh-issue: 90844 +.. nonce: vwITT3 +.. section: Windows + +Allow virtual environments to correctly launch when they have spaces in the +path. + +.. + +.. date: 2022-07-12-20-45-43 +.. gh-issue: 94772 +.. nonce: uNMmdG +.. section: Windows + +Fix incorrect handling of shebang lines in py.exe launcher + +.. + +.. date: 2022-06-20-22-32-14 +.. gh-issue: 94018 +.. nonce: bycC3A +.. section: Windows + +:mod:`zipfile` will now remove trailing spaces from path components when +extracting files on Windows. + +.. + +.. date: 2022-06-15-01-03-52 +.. gh-issue: 93824 +.. nonce: mR4mxu +.. section: Windows + +Drag and drop of files onto Python files in Windows Explorer has been +enabled for Windows ARM64. + +.. + +.. date: 2022-05-28-19-36-13 +.. gh-issue: 43414 +.. nonce: NGMJ3g +.. section: Windows + +:func:`os.get_terminal_size` now attempts to read the size from any provided +handle, rather than only supporting file descriptors 0, 1 and 2. + +.. + +.. date: 2022-05-19-21-44-25 +.. gh-issue: 92817 +.. nonce: Jrf-Kv +.. section: Windows + +Ensures that :file:`py.exe` will prefer an active virtual environment over +default tags specified with environment variables or through a +:file:`py.ini` file. + +.. + +.. date: 2022-05-19-14-01-30 +.. gh-issue: 92984 +.. nonce: Dsxnlr +.. section: Windows + +Explicitly disable incremental linking for non-Debug builds + +.. + +.. date: 2022-05-16-11-45-06 +.. gh-issue: 92841 +.. nonce: NQx107 +.. section: Windows + +:mod:`asyncio` no longer throws ``RuntimeError: Event loop is closed`` on +interpreter exit after asynchronous socket activity. Patch by Oleg Iarygin. + +.. + +.. bpo: 46907 +.. date: 2022-05-05-06-27-59 +.. nonce: IW-uvT +.. section: Windows + +Update Windows installer to use SQLite 3.38.4. + +.. + +.. date: 2022-04-12-18-35-20 +.. gh-issue: 91061 +.. nonce: x40hSK +.. section: Windows + +Accept os.PathLike for the argument to winsound.PlaySound + +.. + +.. bpo: 42658 +.. date: 2022-03-20-15-47-35 +.. nonce: 16eXtb +.. section: Windows + +Support native Windows case-insensitive path comparisons by using +``LCMapStringEx`` instead of :func:`str.lower` in :func:`ntpath.normcase`. +Add ``LCMapStringEx`` to the :mod:`_winapi` module. + +.. + +.. bpo: 38704 +.. date: 2020-01-10-23-33-03 +.. nonce: 2Idtdn +.. section: Windows + +Prevent installation on unsupported Windows versions. + +.. + +.. date: 2022-10-05-15-26-58 +.. gh-issue: 97897 +.. nonce: Rf-C6u +.. section: macOS + +The macOS 13 SDK includes support for the ``mkfifoat`` and ``mknodat`` +system calls. Using the ``dir_fd`` option with either :func:`os.mkfifo` or +:func:`os.mknod` could result in a segfault if cpython is built with the +macOS 13 SDK but run on an earlier version of macOS. Prevent this by adding +runtime support for detection of these system calls ("weaklinking") as is +done for other newer syscalls on macOS. + +.. + +.. date: 2022-10-15-21-20-40 +.. gh-issue: 97527 +.. nonce: otAHJM +.. section: IDLE + +Fix a bug in the previous bugfix that caused IDLE to not start when run with +3.10.8, 3.12.0a1, and at least Microsoft Python 3.10.2288.0 installed +without the Lib/test package. 3.11.0 was never affected. + +.. + +.. date: 2022-08-04-20-07-51 +.. gh-issue: 65802 +.. nonce: xnThWe +.. section: IDLE + +Document handling of extensions in Save As dialogs. + +.. + +.. date: 2022-08-01-23-31-48 +.. gh-issue: 95191 +.. nonce: U7vryB +.. section: IDLE + +Include prompts when saving Shell (interactive input and output). + +.. + +.. date: 2022-07-31-22-15-14 +.. gh-issue: 95511 +.. nonce: WX6PmB +.. section: IDLE + +Fix the Shell context menu copy-with-prompts bug of copying an extra line +when one selects whole lines. + +.. + +.. date: 2022-07-30-15-10-39 +.. gh-issue: 95471 +.. nonce: z3scVG +.. section: IDLE + +In the Edit menu, move ``Select All`` and add a new separator. + +.. + +.. date: 2022-07-29-11-08-52 +.. gh-issue: 95411 +.. nonce: dazlqH +.. section: IDLE + +Enable using IDLE's module browser with .pyw files. + +.. + +.. date: 2022-07-28-18-56-57 +.. gh-issue: 89610 +.. nonce: hcosiM +.. section: IDLE + +Add .pyi as a recognized extension for IDLE on macOS. This allows opening +stub files by double clicking on them in the Finder. + +.. + +.. date: 2022-10-07-22-06-11 +.. gh-issue: 68686 +.. nonce: 6KNIQ4 +.. section: Tools/Demos + +Remove ptags and eptags scripts. + +.. + +.. date: 2022-09-30-18-35-11 +.. gh-issue: 97681 +.. nonce: -KO1Ba +.. section: Tools/Demos + +Remove the ``Tools/demo/`` directory which contained old demo scripts. A +copy can be found in the `old-demos project +<https://github.com/gvanrossum/old-demos>`_. Patch by Victor Stinner. + +.. + +.. date: 2022-09-30-14-30-12 +.. gh-issue: 97669 +.. nonce: gvbgcg +.. section: Tools/Demos + +Remove outdated example scripts of the ``Tools/scripts/`` directory. A copy +can be found in the `old-demos project +<https://github.com/gvanrossum/old-demos>`_. Patch by Victor Stinner. + +.. + +.. date: 2022-08-29-17-25-13 +.. gh-issue: 95853 +.. nonce: Ce17cT +.. section: Tools/Demos + +The ``wasm_build.py`` script now pre-builds Emscripten ports, checks for +broken EMSDK versions, and warns about pkg-config env vars. + +.. + +.. date: 2022-08-10-17-08-43 +.. gh-issue: 95853 +.. nonce: HCjC2m +.. section: Tools/Demos + +The new tool ``Tools/wasm/wasm_builder.py`` automates configure, compile, +and test steps for building CPython on WebAssembly platforms. + +.. + +.. date: 2022-08-05-23-25-59 +.. gh-issue: 95731 +.. nonce: N2KohU +.. section: Tools/Demos + +Fix handling of module docstrings in :file:`Tools/i18n/pygettext.py`. + +.. + +.. date: 2022-07-04-10-02-02 +.. gh-issue: 93939 +.. nonce: U6sW6H +.. section: Tools/Demos + +Add script ``Tools/scripts/check_modules.py`` to check and validate builtin +and shared extension modules. The script also handles ``Modules/Setup`` and +will eventually replace ``setup.py``. + +.. + +.. date: 2022-07-04-01-37-42 +.. gh-issue: 94538 +.. nonce: 1rgy1Y +.. section: Tools/Demos + +Fix Argument Clinic output to custom file destinations. Patch by Erlend E. +Aasland. + +.. + +.. date: 2022-06-29-22-47-11 +.. gh-issue: 94430 +.. nonce: hdov8L +.. section: Tools/Demos + +Allow parameters named ``module`` and ``self`` with custom C names in +Argument Clinic. Patch by Erlend E. Aasland + +.. + +.. date: 2022-06-19-14-56-33 +.. gh-issue: 86087 +.. nonce: R8MkRy +.. section: Tools/Demos + +The ``Tools/scripts/parseentities.py`` script used to parse HTML4 entities +has been removed. + +.. + +.. date: 2022-10-18-16-16-27 +.. gh-issue: 98393 +.. nonce: 55u4BF +.. section: C API + +The :c:func:`PyUnicode_FSDecoder` function no longer accepts bytes-like +paths, like :class:`bytearray` and :class:`memoryview` types: only the exact +:class:`bytes` type is accepted for bytes strings. Patch by Victor Stinner. + +.. + +.. date: 2022-10-05-10-43-32 +.. gh-issue: 91051 +.. nonce: ODDRsQ +.. section: C API + +Add :c:func:`PyType_Watch` and related APIs to allow callbacks on +:c:func:`PyType_Modified`. + +.. + +.. date: 2022-10-03-20-33-24 +.. gh-issue: 95756 +.. nonce: SSmXlG +.. section: C API + +Lazily create and cache ``co_`` attributes for better performance for code +getters. + +.. + +.. date: 2022-09-20-01-04-57 +.. gh-issue: 96512 +.. nonce: msZTjF +.. section: C API + +Configuration for the :ref:`integer string conversion length limitation +<int_max_str_digits>` now lives in the PyConfig C API struct. + +.. + +.. date: 2022-08-16-16-54-42 +.. gh-issue: 95589 +.. nonce: 6xE1ar +.. section: C API + +Extensions classes that set ``tp_dictoffset`` and ``tp_weaklistoffset`` lose +the support for multiple inheritance, but are now safe. Extension classes +should use :const:`Py_TPFLAGS_MANAGED_DICT` and +:const:`Py_TPFLAGS_MANAGED_WEAKREF` instead. + +.. + +.. date: 2022-08-08-14-36-31 +.. gh-issue: 95781 +.. nonce: W_G8YW +.. section: C API + +An unrecognized format character in :c:func:`PyUnicode_FromFormat` and +:c:func:`PyUnicode_FromFormatV` now sets a :exc:`SystemError`. In previous +versions it caused all the rest of the format string to be copied as-is to +the result string, and any extra arguments discarded. + +.. + +.. date: 2022-08-03-14-39-08 +.. gh-issue: 92678 +.. nonce: ozFTEx +.. section: C API + +Restore the 3.10 behavior for multiple inheritance of C extension classes +that store their dictionary at the end of the struct. + +.. + +.. date: 2022-08-03-13-01-57 +.. gh-issue: 92678 +.. nonce: DLwONN +.. section: C API + +Support C extensions using managed dictionaries by setting the +``Py_TPFLAGS_MANAGED_DICT`` flag. + +.. + +.. date: 2022-08-01-16-21-39 +.. gh-issue: 93274 +.. nonce: QoDHEu +.. section: C API + +API for implementing vectorcall (:c:data:`Py_TPFLAGS_HAVE_VECTORCALL`, +:c:func:`PyVectorcall_NARGS` and :c:func:`PyVectorcall_Call`) was added to +the limited API and stable ABI. + +.. + +.. date: 2022-07-31-21-58-27 +.. gh-issue: 95504 +.. nonce: wy7B1F +.. section: C API + +Fix sign placement when specifying width or precision in +:c:func:`PyUnicode_FromFormat` and :c:func:`PyUnicode_FromFormatV`. Patch by +Philip Georgi. + +.. + +.. date: 2022-07-29-15-24-45 +.. gh-issue: 93012 +.. nonce: -DdGEy +.. section: C API + +The :const:`Py_TPFLAGS_HAVE_VECTORCALL` flag is now removed from a class +when the class's :py:meth:`~object.__call__` method is reassigned. This +makes vectorcall safe to use with mutable types (i.e. heap types without the +:const:`immutable <Py_TPFLAGS_IMMUTABLETYPE>` flag). Mutable types that do +not override :c:member:`~PyTypeObject.tp_call` now inherit the +:const:`Py_TPFLAGS_HAVE_VECTORCALL` flag. + +.. + +.. date: 2022-07-29-10-41-59 +.. gh-issue: 95388 +.. nonce: aiRSgr +.. section: C API + +Creating :c:data:`immutable types <Py_TPFLAGS_IMMUTABLETYPE>` with mutable +bases is deprecated and is planned to be disabled in Python 3.14. + +.. + +.. date: 2022-07-25-15-54-27 +.. gh-issue: 92678 +.. nonce: ziZpxz +.. section: C API + +Adds unstable C-API functions ``_PyObject_VisitManagedDict`` and +``_PyObject_ClearManagedDict`` to allow C extensions to allow the VM to +manage their object's dictionaries. + +.. + +.. date: 2022-07-19-22-37-40 +.. gh-issue: 94936 +.. nonce: LGlmKv +.. section: C API + +Added :c:func:`PyCode_GetVarnames`, :c:func:`PyCode_GetCellvars` and +:c:func:`PyCode_GetFreevars` for accessing ``co_varnames``, ``co_cellvars`` +and ``co_freevars`` respectively via the C API. + +.. + +.. date: 2022-07-17-18-21-40 +.. gh-issue: 94930 +.. nonce: gPFGDL +.. section: C API + +Fix ``SystemError`` raised when :c:func:`PyArg_ParseTupleAndKeywords` is +used with ``#`` in ``(...)`` but without ``PY_SSIZE_T_CLEAN`` defined. + +.. + +.. date: 2022-07-12-17-39-32 +.. gh-issue: 94731 +.. nonce: 9CPJNU +.. section: C API + +Python again uses C-style casts for most casting operations when compiled +with C++. This may trigger compiler warnings, if they are enabled with e.g. +``-Wold-style-cast`` or ``-Wzero-as-null-pointer-constant`` options for +``g++``. + +.. + +.. date: 2022-06-17-13-41-38 +.. gh-issue: 93937 +.. nonce: uKVTEh +.. section: C API + +The following frame functions and type are now directly available with +``#include <Python.h>``, it's no longer needed to add ``#include +<frameobject.h>``: + +* :c:func:`PyFrame_Check` +* :c:func:`PyFrame_GetBack` +* :c:func:`PyFrame_GetBuiltins` +* :c:func:`PyFrame_GetGenerator` +* :c:func:`PyFrame_GetGlobals` +* :c:func:`PyFrame_GetLasti` +* :c:func:`PyFrame_GetLocals` +* :c:type:`PyFrame_Type` + +Patch by Victor Stinner. + +.. + +.. date: 2022-06-13-21-37-31 +.. gh-issue: 91321 +.. nonce: DgJFvS +.. section: C API + +Fix the compatibility of the Python C API with C++ older than C++11. Patch +by Victor Stinner. + +.. + +.. date: 2022-06-10-23-41-48 +.. gh-issue: 91731 +.. nonce: fhYUQG +.. section: C API + +Avoid defining the ``static_assert`` when compiling with C++ 11, where this +is a keyword and redefining it can lead to undefined behavior. Patch by +Pablo Galindo + +.. + +.. date: 2022-06-10-16-50-27 +.. gh-issue: 89546 +.. nonce: mX1f10 +.. section: C API + +:c:func:`PyType_FromMetaclass` (and other ``PyType_From*`` functions) now +check that offsets and the base class's +:c:member:`~PyTypeObject.tp_basicsize` fit in the new class's +``tp_basicsize``. + +.. + +.. date: 2022-06-06-16-04-14 +.. gh-issue: 93503 +.. nonce: MHJTu8 +.. section: C API + +Add two new public functions to the public C-API, +:c:func:`PyEval_SetProfileAllThreads` and +:c:func:`PyEval_SetTraceAllThreads`, that allow to set tracing and profiling +functions in all running threads in addition to the calling one. Also, two +analogous functions to the :mod:`threading` module +(:func:`threading.setprofile_all_threads` and +:func:`threading.settrace_all_threads`) that allow to do the same from +Python. Patch by Pablo Galindo + +.. + +.. date: 2022-06-04-13-15-41 +.. gh-issue: 93442 +.. nonce: 4M4NDb +.. section: C API + +Add C++ overloads for _Py_CAST_impl() to handle 0/NULL. This will allow C++ +extensions that pass 0 or NULL to macros using _Py_CAST() to continue to +compile. + +.. + +.. date: 2022-06-03-14-54-41 +.. gh-issue: 93466 +.. nonce: DDtH0X +.. section: C API + +Slot IDs in PyType_Spec may not be repeated. The documentation was updated +to mention this. For some cases of repeated slots, PyType_FromSpec and +related functions will now raise an exception. + +.. + +.. date: 2022-05-23-15-22-18 +.. gh-issue: 92898 +.. nonce: Qjc9d3 +.. section: C API + +Fix C++ compiler warnings when casting function arguments to ``PyObject*``. +Patch by Serge Guelton. + +.. + +.. date: 2022-05-23-13-33-18 +.. gh-issue: 93103 +.. nonce: ooD3Eb +.. section: C API + +Deprecate global configuration variables, like +:c:var:`Py_IgnoreEnvironmentFlag`, in the documentation: the +:c:func:`Py_InitializeFromConfig` API should be instead. Patch by Victor +Stinner. + +.. + +.. date: 2022-05-23-12-31-04 +.. gh-issue: 77782 +.. nonce: ugC8dn +.. section: C API + +Deprecate global configuration variable like +:c:var:`Py_IgnoreEnvironmentFlag`: the :c:func:`Py_InitializeFromConfig` API +should be instead. Patch by Victor Stinner. + +.. + +.. date: 2022-05-19-18-05-51 +.. gh-issue: 92913 +.. nonce: Ass1Hv +.. section: C API + +Ensures changes to :c:member:`PyConfig.module_search_paths` are ignored +unless :c:member:`PyConfig.module_search_paths_set` is set + +.. + +.. date: 2022-05-13-18-17-48 +.. gh-issue: 92781 +.. nonce: TVDr3- +.. section: C API + +Avoid mixing declarations and code in the C API to fix the compiler warning: +"ISO C90 forbids mixed declarations and code" +[-Werror=declaration-after-statement]. Patch by Victor Stinner. + +.. + +.. date: 2022-05-11-02-33-10 +.. gh-issue: 92651 +.. nonce: FIXLf0 +.. section: C API + +Remove the ``token.h`` header file. There was never any public tokenizer C +API. The ``token.h`` header file was only designed to be used by Python +internals. Patch by Victor Stinner. + +.. + +.. date: 2022-05-10-12-35-42 +.. gh-issue: 92536 +.. nonce: cAoRCZ +.. section: C API + +Remove legacy Unicode APIs based on ``Py_UNICODE*``. + +.. + +.. date: 2022-05-09-23-16-38 +.. gh-issue: 85858 +.. nonce: VIcNDL +.. section: C API + +Remove the ``PyUnicode_InternImmortal()`` function and the +``SSTATE_INTERNED_IMMORTAL`` macro. Patch by Victor Stinner. + +.. + +.. date: 2022-05-03-19-35-37 +.. gh-issue: 92193 +.. nonce: 61VoFL +.. section: C API + +Add new function :c:func:`PyFunction_SetVectorcall` to the C API which sets +the vectorcall field of a given :c:type:`PyFunctionObject`. + +Warning: extensions using this API must preserve the behavior of the +unaltered function! + +.. + +.. date: 2022-04-13-16-10-55 +.. gh-issue: 59121 +.. nonce: -B7mKp +.. section: C API + +Fixed an assert that prevented ``PyRun_InteractiveOne`` from providing +tracebacks when parsing from the provided FD. + +.. + +.. bpo: 45383 +.. date: 2021-10-05-21-59-43 +.. nonce: TVClgf +.. section: C API + +The :c:func:`PyType_FromSpec` API will now find and use a metaclass based on +the provided bases. An error will be raised if there is a metaclass +conflict. |