3.11.0a3 - Cpython — ContextQMD

.. bpo: 46009 .. date: 2021-12-08-11-06-53 .. nonce: cL8pH0 .. release date: 2021-12-08 .. section: Core and Builtins

Restore behavior from 3.9 and earlier when sending non-None to newly started generator. In 3.9 this did not affect the state of the generator. In 3.10.0 and 3.10.1 gen_func().send(0) is equivalent to gen_func().throw(TypeError(...) which exhausts the generator. In 3.10.2 onward, the behavior has been reverted to that of 3.9.

.. bpo: 46004 .. date: 2021-12-07-11-24-24 .. nonce: TTEU1p .. section: Core and Builtins

Fix the :exc:SyntaxError location for errors involving for loops with invalid targets. Patch by Pablo Galindo

.. bpo: 45711 .. date: 2021-12-05-17-36-08 .. nonce: 3TmTSw .. section: Core and Builtins

:c:func:!_PyErr_ChainStackItem no longer normalizes exc_info (including setting the traceback on the exception instance) because exc_info is always normalized.

.. bpo: 45607 .. date: 2021-12-01-15-38-04 .. nonce: JhuF8b .. section: Core and Builtins

The __note__ field was added to :exc:BaseException. It is None by default but can be set to a string which is added to the exception's traceback.

.. bpo: 45947 .. date: 2021-12-01-14-06-36 .. nonce: 1XPPm_ .. section: Core and Builtins

Place pointers to dict and values immediately before GC header. This reduces number of dependent memory loads to access either dict or values from 3 to 1.

.. bpo: 45915 .. date: 2021-11-28-11-25-08 .. nonce: TSGcLF .. section: Core and Builtins

is_valid_fd now uses faster fcntl(fd, F_GETFD) on Linux, macOS, and Windows.

.. bpo: 44530 .. date: 2021-11-26-23-26-25 .. nonce: EZ0gel .. section: Core and Builtins

Reverts a change to the code.__new__ :ref:audit event <audit-events> from an earlier prerelease.

.. bpo: 42268 .. date: 2021-11-26-22-31-22 .. nonce: 3wl-09 .. section: Core and Builtins

Fail the configure step if the selected compiler doesn't support memory sanitizer. Patch by Pablo Galindo

.. bpo: 45711 .. date: 2021-11-25-17-51-29 .. nonce: D2igmz .. section: Core and Builtins

The three values of exc_info are now always consistent with each other. In particular, the type and traceback fields are now derived from the exception instance. This impacts the return values of :func:sys.exc_info and :c:func:PyErr_GetExcInfo() if the exception instance is modified while the exception is handled, as well as :c:func:PyErr_SetExcInfo(), which now ignores the type and traceback arguments provided to it.

.. bpo: 45727 .. date: 2021-11-24-18-24-49 .. nonce: _xVbbo .. section: Core and Builtins

Refine the custom syntax error that suggests that a comma may be missing to trigger only when the expressions are detected between parentheses or brackets. Patch by Pablo Galindo

.. bpo: 45885 .. date: 2021-11-23-21-01-56 .. nonce: 3IxeCX .. section: Core and Builtins

Specialized the COMPARE_OP opcode using the PEP 659 machinery.

.. bpo: 45786 .. date: 2021-11-23-15-25-00 .. nonce: UdEciD .. section: Core and Builtins

Allocate space for the interpreter frame in the frame object, to avoid an additional allocation when the frame object outlives the frame activation.

.. bpo: 45614 .. date: 2021-11-23-12-06-41 .. nonce: fIekgI .. section: Library

Fix :mod:traceback display for exceptions with invalid module name.

.. bpo: 45813 .. date: 2021-11-22-11-28-13 .. nonce: ZMaWE2 .. section: Core and Builtins

Fix crash when calling coro.cr_frame.clear() after coroutine has been freed.

.. bpo: 45811 .. date: 2021-11-20-02-25-06 .. nonce: B-1Gsr .. section: Core and Builtins

Improve the tokenizer errors when encountering invisible control characters in the parser. Patch by Pablo Galindo

.. bpo: 45848 .. date: 2021-11-19-22-57-42 .. nonce: HgVBJ5 .. section: Core and Builtins

Allow the parser to obtain error lines directly from encoded files. Patch by Pablo Galindo

.. bpo: 45709 .. date: 2021-11-19-13-17-47 .. nonce: H_t7ut .. section: Core and Builtins

Restore behavior from 3.10 when tracing an exception raised within a with statement.

.. bpo: 44525 .. date: 2021-11-18-10-02-02 .. nonce: M4xwn_ .. section: Core and Builtins

Adds new :opcode:COPY_FREE_VARS opcode, to make copying of free variables from function to frame explicit. Helps optimization of calls to Python function.

.. bpo: 45829 .. date: 2021-11-17-10-14-35 .. nonce: 5Cf6fY .. section: Core and Builtins

Specialize :opcode:BINARY_SUBSCR for classes with a __getitem__ method implemented in Python

.. bpo: 45826 .. date: 2021-11-17-08-05-27 .. nonce: OERoTm .. section: Core and Builtins

Fixed a crash when calling .with_traceback(None) on NameError. This occurs internally in unittest.TestCase.assertRaises().

.. bpo: 45822 .. date: 2021-11-16-19-41-04 .. nonce: OT6ueS .. section: Core and Builtins

Fixed a bug in the parser that was causing it to not respect :pep:263 coding cookies when no flags are provided. Patch by Pablo Galindo

.. bpo: 45820 .. date: 2021-11-16-19-00-27 .. nonce: 2X6Psr .. section: Core and Builtins

Fix a segfault when the parser fails without reading any input. Patch by Pablo Galindo

.. bpo: 45636 .. date: 2021-11-15-13-32-54 .. nonce: RDlTdL .. section: Core and Builtins

Simplify the implementation of :opcode:BINARY_OP by indexing into an array of function pointers (rather than switching on the oparg).

.. bpo: 42540 .. date: 2021-11-15-12-08-27 .. nonce: V2w107 .. section: Core and Builtins

Fix crash when :func:os.fork is called with an active non-default memory allocator.

.. bpo: 45738 .. date: 2021-11-14-00-14-45 .. nonce: e0cgKd .. section: Core and Builtins

Fix computation of error location for invalid continuation characters in the parser. Patch by Pablo Galindo.

.. bpo: 45636 .. date: 2021-11-11-19-11-57 .. nonce: 2fyIVm .. section: Core and Builtins

Remove an existing "fast path" for old-style string formatting, since it no longer appears to have any measurable impact.

.. bpo: 45753 .. date: 2021-11-11-17-14-21 .. nonce: nEBFcC .. section: Core and Builtins

Make recursion checks a bit more efficient by tracking amount of calls left before overflow.

.. bpo: 45773 .. date: 2021-11-09-13-01-35 .. nonce: POU8A4 .. section: Core and Builtins

Fix a compiler hang when attempting to optimize certain jump patterns.

.. bpo: 45764 .. date: 2021-11-09-12-19-22 .. nonce: 8RLhWL .. section: Core and Builtins

The parser now gives a better error message when leaving out the opening parenthesis ( after a def-statement::

>>> def f:
  File "<stdin>", line 1
    def f:
         ^
SyntaxError: expected '('

.. bpo: 45609 .. date: 2021-10-27-21-00-49 .. nonce: L1GKPX .. section: Core and Builtins

Specialized the STORE_SUBSCR opcode using the PEP 659 machinery.

.. bpo: 45636 .. date: 2021-10-27-15-14-31 .. nonce: K2X7QS .. section: Core and Builtins

Replace all numeric BINARY_* and INPLACE_* instructions with a single :opcode:BINARY_OP implementation.

.. bpo: 45582 .. date: 2021-10-23-00-39-31 .. nonce: YONPuo .. section: Core and Builtins

Path calculation (known as getpath) has been reimplemented as a frozen Python module. This should have no visible impact, but may affect calculation of all paths referenced in :mod:sys and :mod:sysconfig.

.. bpo: 45450 .. date: 2021-10-12-18-22-44 .. nonce: d9a-bX .. section: Core and Builtins

Improve the syntax error message for parenthesized arguments. Patch by Pablo Galindo.

.. bpo: 27946 .. date: 2021-12-04-20-08-42 .. nonce: -Vuarf .. section: Library

Fix possible crash when getting an attribute of :class:xml.etree.ElementTree.Element simultaneously with replacing the attrib dict.

.. bpo: 45711 .. date: 2021-12-02-17-22-06 .. nonce: D6jsdv .. section: Library

Make :mod:asyncio normalize exceptions as soon as they are captured with :c:func:PyErr_Fetch, and before they are stored as an exc_info triplet. This brings :mod:asyncio in line with the rest of the codebase, where an exc_info triplet is always normalized.

.. bpo: 23819 .. date: 2021-12-02-14-37-30 .. nonce: An6vkT .. section: Library

Replaced asserts with exceptions in asyncio, patch by Kumar Aditya.

.. bpo: 13236 .. date: 2021-11-30-13-52-02 .. nonce: FmJIkO .. section: Library

:class:unittest.TextTestResult and :class:unittest.TextTestRunner flush now the output stream more often.

.. bpo: 45917 .. date: 2021-11-28-17-24-11 .. nonce: J5TIrd .. section: Library

Added :func:math.exp2:, which returns 2 raised to the power of x.

.. bpo: 37658 .. date: 2021-11-28-15-30-34 .. nonce: 8Hno7d .. section: Library

Fix issue when on certain conditions asyncio.wait_for() may allow a coroutine to complete successfully, but fail to return the result, potentially causing memory leaks or other issues.

.. bpo: 45876 .. date: 2021-11-23-15-36-56 .. nonce: NO8Yaj .. section: Library

Improve the accuracy of stdev() and pstdev() in the statistics module. When the inputs are floats or fractions, the output is a correctly rounded float

.. bpo: 44649 .. date: 2021-11-21-20-50-42 .. nonce: E8M936 .. section: Library

Handle dataclass(slots=True) with a field that has default a default value, but for which init=False.

.. bpo: 45803 .. date: 2021-11-20-17-04-25 .. nonce: wSgFOy .. section: Library

Added missing kw_only parameter to dataclasses.make_dataclass().

.. bpo: 45837 .. date: 2021-11-18-13-13-19 .. nonce: aGyr1I .. section: Library

The :meth:!turtle.RawTurtle.settiltangle is deprecated since Python 3.1, it now emits a deprecation warning and will be removed in Python 3.13.

Use :meth:turtle.RawTurtle.tiltangle instead.

:meth:turtle.RawTurtle.tiltangle was earlier incorrectly marked as deprecated, its docstring has been corrected.

Patch by Hugo van Kemenade.

.. bpo: 45831 .. date: 2021-11-17-19-25-37 .. nonce: 9-TojK .. section: Library

:mod:faulthandler can now write ASCII-only strings (like filenames and function names) with a single write() syscall when dumping a traceback. It reduces the risk of getting an unreadable dump when two threads or two processes dump a traceback to the same file (like stderr) at the same time. Patch by Victor Stinner.

.. bpo: 45828 .. date: 2021-11-17-11-40-21 .. nonce: kQU35U .. section: Library

:mod:sqlite C callbacks now use unraisable exceptions if callback tracebacks are enabled. Patch by Erlend E. Aasland.

.. bpo: 41735 .. date: 2021-11-16-18-13-49 .. nonce: D72UY1 .. section: Library

Fix thread lock in zlib.Decompress.flush() method before PyObject_GetBuffer.

.. bpo: 45235 .. date: 2021-11-11-13-03-17 .. nonce: 8ZbkHa .. section: Library

Reverted an argparse bugfix that caused regression in the handling of default arguments for subparsers. This prevented leaf level arguments from taking precedence over root level arguments.

.. bpo: 45754 .. date: 2021-11-09-15-48-38 .. nonce: c-JDto .. section: Library

Fix a regression in Python 3.11a1 and 3.11a2 where :mod:sqlite3 incorrectly would use SQLITE_LIMIT_LENGTH when checking SQL statement lengths. Now, SQLITE_LIMIT_SQL_LENGTH is used. Patch by Erlend E. Aasland.

.. bpo: 45766 .. date: 2021-11-09-09-18-06 .. nonce: dvbcMf .. section: Library

Added proportional option to :meth:statistics.linear_regression.

.. bpo: 45765 .. date: 2021-11-09-09-04-19 .. nonce: JVobxK .. section: Library

In importlib.metadata, fix distribution discovery for an empty path.

.. bpo: 45757 .. date: 2021-11-08-23-22-14 .. nonce: MHZHt3 .. section: Library

Fix bug where :mod:dis produced an incorrect oparg when :opcode:EXTENDED_ARG is followed by an opcode that does not use its argument.

.. bpo: 45644 .. date: 2021-11-06-17-47-46 .. nonce: ZMqHD_ .. section: Library

In-place JSON file formatting using python3 -m json.tool infile infile now works correctly, previously it left the file empty. Patch by Chris Wesseling.

.. bpo: 45703 .. date: 2021-11-03-13-41-49 .. nonce: 35AagL .. section: Library

When a namespace package is imported before another module from the same namespace is created/installed in a different :data:sys.path location while the program is running, calling the :func:importlib.invalidate_caches function will now also guarantee the new module is noticed.

.. bpo: 45535 .. date: 2021-10-29-16-28-06 .. nonce: n8NiOE .. section: Library

Improve output of dir() with Enums.

.. bpo: 45664 .. date: 2021-10-28-23-40-54 .. nonce: 7dqtxQ .. section: Library

Fix :func:types.resolve_bases and :func:types.new_class for :class:types.GenericAlias instance as a base.

.. bpo: 45663 .. date: 2021-10-28-23-11-59 .. nonce: J90N5R .. section: Library

Fix :func:dataclasses.is_dataclass for dataclasses which are subclasses of :class:types.GenericAlias.

.. bpo: 45662 .. date: 2021-10-28-22-58-14 .. nonce: sJd7Ir .. section: Library

Fix the repr of :data:dataclasses.InitVar with a type alias to the built-in class, e.g. InitVar[list[int]].

.. bpo: 43137 .. date: 2021-10-25-12-51-02 .. nonce: apo7jY .. section: Library

Launch GNOME web browsers via gio tool instead of obsolete gvfs-open

.. bpo: 45429 .. date: 2021-10-25-01-22-49 .. nonce: VaEyN9 .. section: Library

On Windows, :func:time.sleep now uses a waitable timer which supports high-resolution timers. Patch by Donghee Na and Eryk Sun.

.. bpo: 37295 .. date: 2021-10-18-16-08-55 .. nonce: wBEWH2 .. section: Library

Optimize :func:math.comb and :func:math.perm.

.. bpo: 45514 .. date: 2021-10-18-14-25-35 .. nonce: YmlzIl .. section: Library

Deprecated legacy functions in :mod:importlib.resources.

.. bpo: 45507 .. date: 2021-10-18-14-00-01 .. nonce: lDotNV .. section: Library

Add tests for truncated/missing trailers in gzip.decompress implementation.

.. bpo: 45359 .. date: 2021-10-03-22-27-35 .. nonce: LX_uxe .. section: Library

Implement :pep:585 for :class:graphlib.TopologicalSorter.

.. bpo: 44733 .. date: 2021-07-26-13-33-37 .. nonce: 88LrP1 .. section: Library

Add max_tasks_per_child to :class:concurrent.futures.ProcessPoolExecutor. This allows users to specify the maximum number of tasks a single process should execute before the process needs to be restarted.

.. bpo: 28806 .. date: 2021-05-24-13-48-34 .. nonce: PkNw5D .. section: Library

Improve netrc library. netrc file no longer needs to contain all tokens. And if the login name is anonymous, security check is no longer need.

.. bpo: 43498 .. date: 2021-04-20-14-14-16 .. nonce: L_Hq-8 .. section: Library

Avoid a possible "RuntimeError: dictionary changed size during iteration" when adjusting the process count of :class:ProcessPoolExecutor.

.. bpo: 42158 .. date: 2020-11-10-17-46-12 .. nonce: OhxAiH .. section: Library

Add MIME types for N-quads, N-triples, Notation3 and TriG to mimetypes.

.. bpo: 30533 .. date: 2020-06-16-18-00-56 .. nonce: StL57t .. section: Library

Add :func:inspect.getmembers_static , it return all members without triggering dynamic lookup via the descriptor protocol. Patch by Weipeng Hong.

.. bpo: 42238 .. date: 2021-11-20-02-46-39 .. nonce: hlfMIc .. section: Documentation

make -C Doc suspicious will be removed soon in favor of make -C Doc check, mark it as deprecated.

.. bpo: 45840 .. date: 2021-11-19-02-02-32 .. nonce: A51B2S .. section: Documentation

Improve cross-references in the documentation for the data model.

.. bpo: 45640 .. date: 2021-11-18-16-44-12 .. nonce: lSpc2A .. section: Documentation

Properly marked-up grammar tokens in the documentation are now clickable and take you to the definition of a given piece of grammar. Patch by Arthur Milchior.

.. bpo: 45788 .. date: 2021-11-18-00-07-40 .. nonce: qibUoB .. section: Documentation

Link doc for sys.prefix to sysconfig doc on installation paths.

.. bpo: 45772 .. date: 2021-11-09-13-10-55 .. nonce: EdrM3t .. section: Documentation

socket.socket documentation is corrected to a class from a function.

.. bpo: 45392 .. date: 2021-11-06-10-54-17 .. nonce: JZnVOz .. section: Documentation

Update the docstring of the :class:type built-in to remove a redundant line and to mention keyword arguments for the constructor.

.. bpo: 45250 .. date: 2021-10-22-12-09-18 .. nonce: Iit5-Y .. section: Documentation

Update the documentation to note that CPython does not consistently require iterators to define __iter__.

.. bpo: 25381 .. date: 2021-06-21-17-51-51 .. nonce: 7Kn-_H .. section: Documentation

In the extending chapter of the extending doc, update a paragraph about the global variables containing exception information.

.. bpo: 43905 .. date: 2021-05-24-05-00-12 .. nonce: tBIndE .. section: Documentation

Expanded :func:~dataclasses.astuple and :func:~dataclasses.asdict docs, warning about deepcopy being applied and providing a workaround.

.. bpo: 45695 .. date: 2021-12-03-14-19-16 .. nonce: QKBn2E .. section: Tests

Out-of-tree builds with a read-only source directory are now tested by CI.

.. bpo: 19460 .. date: 2021-11-28-15-25-02 .. nonce: lr0aWs .. section: Tests

Add new Test for Lib/email/mime/nonmultipart.py::MIMENonMultipart.

.. bpo: 45835 .. date: 2021-11-17-14-28-08 .. nonce: Mgyhjx .. section: Tests

Fix race condition in test_queue tests with multiple "feeder" threads.

.. bpo: 45783 .. date: 2021-11-11-13-56-00 .. nonce: 8k1Rng .. section: Tests

The test for the freeze tool now handles file moves and deletions.

.. bpo: 45745 .. date: 2021-11-10-12-01-28 .. nonce: wX5B3K .. section: Tests

Remove the --findleaks command line option of regrtest: use the --fail-env-changed option instead. Since Python 3.7, it was a deprecated alias to the --fail-env-changed option.

.. bpo: 45701 .. date: 2021-10-31-10-58-45 .. nonce: r0LAUL .. section: Tests

Add tests with tuple type with :func:functools.lru_cache to test_functools.

.. bpo: 44035 .. date: 2021-12-06-09-31-27 .. nonce: BiO4XC .. section: Build

CI now verifies that autoconf files have been regenerated with a current and unpatched autoconf package.

.. bpo: 45950 .. date: 2021-12-01-17-28-39 .. nonce: eEVLoz .. section: Build

The build system now uses a :program:_bootstrap_python interpreter for freezing and deepfreezing again. To speed up build process the build tools :program:_bootstrap_python and :program:_freeze_module are no longer build with LTO.

.. bpo: 45881 .. date: 2021-11-29-16-32-55 .. nonce: 7597J6 .. section: Build

The :program:configure script now accepts --with-build-python and --with-freeze-module options to make cross compiling easier.

.. bpo: 40280 .. date: 2021-11-29-14-37-29 .. nonce: UlTMR8 .. section: Build

Emscripten platform now uses .wasm suffix by default.

.. bpo: 40280 .. date: 2021-11-29-11-24-45 .. nonce: Knx7d7 .. section: Build

Disable unusable core extension modules on WASM/Emscripten targets.

.. bpo: 40280 .. date: 2021-11-26-14-09-04 .. nonce: ZLpwQf .. section: Build

configure now checks for socket shutdown function. The check makes it possible to disable SYS_shutdown with ac_cv_func_shutdown=no in CONFIG_SITE.

.. bpo: 40280 .. date: 2021-11-26-09-10-19 .. nonce: xmiMJl .. section: Build

configure now checks for functions fork1, getegid, geteuid, getgid, getppid, getuid, opendir, pipe, system, wait, ttyname.

.. bpo: 33393 .. date: 2021-11-25-20-26-06 .. nonce: 24YNtM .. section: Build

Update config.guess to 2021-06-03 and config.sub to 2021-08-14. Makefile now has an update-config target to make updating more convenient.

.. bpo: 45866 .. date: 2021-11-25-13-53-36 .. nonce: ZH1W8N .. section: Build

make regen-all now produces the same output when run from a directory other than the source tree: when building Python out of the source tree. pegen now strips directory of the "generated by pygen from <FILENAME>" header Patch by Victor Stinner.

.. bpo: 40280 .. date: 2021-11-25-10-55-03 .. nonce: E9-gsQ .. section: Build

configure now accepts machine wasm32 or wasm64 and OS wasi or emscripten for cross building, e.g. wasm32-unknown-emscripten, wasm32-wasi, or wasm32-unknown-wasi.

.. bpo: 41498 .. date: 2021-11-25-09-15-04 .. nonce: qAk5eo .. section: Build

Python now compiles on platforms without sigset_t. Several functions in :mod:signal are not available when sigset_t is missing.

Based on patch by Roman Yurchak for pyodide.

.. bpo: 45881 .. date: 2021-11-24-17-14-06 .. nonce: GTXXLk .. section: Build

setup.py now uses CC from environment first to discover multiarch and cross compile paths.

.. bpo: 45886 .. date: 2021-11-23-23-37-49 .. nonce: _Ulnh- .. section: Build

The _freeze_module program path can now be overridden on the command line, e.g. make FREEZE_MODULE=../x86_64/Program/_freeze_module.

.. bpo: 45873 .. date: 2021-11-23-04-28-40 .. nonce: 9dldZ4 .. section: Build

Get rid of the _bootstrap_python build step. The deepfreeze.py script is now run using $(PYTHON_FOR_REGEN) which can be Python 3.7 or newer (on Windows, 3.8 or newer).

.. bpo: 45847 .. date: 2021-11-19-17-57-57 .. nonce: 9phcpd .. section: Build

Port builtin hashlib extensions to PY_STDLIB_MOD macro and addext().

.. bpo: 45723 .. date: 2021-11-19-15-42-27 .. nonce: vwIJWI .. section: Build

Add autoconf helpers for saving and restoring environment variables:

SAVE_ENV: Save $CFLAGS, $LDFLAGS, $LIBS, and $CPPFLAGS.
RESTORE_ENV: Restore $CFLAGS, $LDFLAGS, $LIBS, and $CPPFLAGS.
WITH_SAVE_ENV([SCRIPT]): Run SCRIPT wrapped with SAVE_ENV and RESTORE_ENV.

Patch by Erlend E. Aasland.

.. bpo: 45573 .. date: 2021-11-18-13-31-02 .. nonce: LCjGB8 .. section: Build

Mandatory core modules, that are required to bootstrap Python, are now in Modules/Setup.bootstrap.

.. bpo: 45573 .. date: 2021-11-18-12-18-43 .. nonce: xsMZzn .. section: Build

configure now creates Modules/Setup.stdlib with conditionally enabled/disabled extension module lines. The file is not used, yet.

.. bpo: 45573 .. date: 2021-11-17-19-02-51 .. nonce: GMNdun .. section: Build

configure now uses a unified format to set state, compiler flags, and linker flags in Makefile. The new macro PY_STDLIB_MOD sets three variables that are consumed by Modules/Setup and setup.py.

.. bpo: 45816 .. date: 2021-11-16-14-44-06 .. nonce: nbdmVK .. section: Build

Python now supports building with Visual Studio 2022 (MSVC v143, VS Version 17.0). Patch by Jeremiah Vivian.

.. bpo: 45800 .. date: 2021-11-13-16-40-05 .. nonce: 5Hz6nr .. section: Build

Settings for :mod:pyexpat C extension are now detected by configure. The bundled expat library is built in Makefile.

.. bpo: 45798 .. date: 2021-11-13-10-18-22 .. nonce: IraaTs .. section: Build

Settings for :mod:decimal internal C extension are now detected by configure. The bundled libmpdec library is built in Makefile.

.. bpo: 45723 .. date: 2021-11-10-16-13-02 .. nonce: B5gCB1 .. section: Build

:program:configure has a new option --with-pkg-config to disable or require pkg-config.

.. bpo: 45774 .. date: 2021-11-09-23-30-12 .. nonce: Mwm3ZR .. section: Build

The build dependencies for :mod:sqlite3 are now detected by configure and pkg-config. Patch by Erlend E. Aasland.

.. bpo: 45763 .. date: 2021-11-09-10-15-33 .. nonce: gP-vrX .. section: Build

The build dependencies for :mod:zlib, :mod:bz2, and :mod:lzma are now detected by configure.

.. bpo: 45747 .. date: 2021-11-08-11-31-48 .. nonce: AODmk_ .. section: Build

gdbm and dbm build dependencies are now detected by configure.

.. bpo: 45743 .. date: 2021-11-08-08-58-06 .. nonce: fZ8CTi .. section: Build

On macOS, the build system no longer passes search_paths_first to the linker. The flag has been the default since Xcode 4 / macOS 10.6.

.. bpo: 45723 .. date: 2021-11-07-10-45-40 .. nonce: AreusF .. section: Build

configure.ac is now compatible with autoconf 2.71. Deprecated checks STDC_HEADERS and AC_HEADER_TIME have been removed.

.. bpo: 45723 .. date: 2021-11-07-10-36-12 .. nonce: JNwKSG .. section: Build

configure now prints a warning when pkg-config is missing.

.. bpo: 45731 .. date: 2021-11-05-20-56-29 .. nonce: 9SDnDf .. section: Build

configure --enable-loadable-sqlite-extensions is now handled by new PY_SQLITE_ENABLE_LOAD_EXTENSION macro instead of logic in setup.py.

.. bpo: 45723 .. date: 2021-11-05-15-09-49 .. nonce: gfSxur .. section: Build

configure.ac now uses custom helper macros and AC_CACHE_CHECK to simplify and speed up configure runs.

.. bpo: 45696 .. date: 2021-11-03-00-19-50 .. nonce: eKs46f .. section: Build

Skip the marshal step for frozen modules by generating C code that produces a set of ready-to-use code objects. This speeds up startup time by another 10% or more.

.. bpo: 45561 .. date: 2021-10-21-14-38-30 .. nonce: PVqhZE .. section: Build

Run smelly.py tool from $(srcdir).

.. bpo: 46105 .. date: 2021-12-08-16-36-20 .. nonce: t1mJ6Q .. section: Windows

Fixed calculation of :data:sys.path in a venv on Windows.

.. bpo: 45901 .. date: 2021-11-26-18-17-41 .. nonce: c5IBqM .. section: Windows

When installed through the Microsoft Store and set as the default app for :file:*.py files, command line arguments will now be passed to Python when invoking a script without explicitly launching Python (that is, script.py args rather than python script.py args).

.. bpo: 45616 .. date: 2021-11-23-11-44-42 .. nonce: K52PLZ .. section: Windows

Fix Python Launcher's ability to distinguish between versions 3.1 and 3.10 when either one is explicitly requested. Previously, 3.1 would be used if 3.10 was requested but not installed, and 3.10 would be used if 3.1 was requested but 3.10 was installed.

.. bpo: 45850 .. date: 2021-11-20-00-06-59 .. nonce: q9lofz .. section: Windows

Implement changes to build with deep-frozen modules on Windows. Note that we now require Python 3.10 as the "bootstrap" or "host" Python.

.. bpo: 45732 .. date: 2021-11-08-21-53-11 .. nonce: idl5kx .. section: Windows

Updates bundled Tcl/Tk to 8.6.12.

.. bpo: 45720 .. date: 2021-11-05-01-05-46 .. nonce: 47Nc5I .. section: Windows

Internal reference to :file:shlwapi.dll was dropped to help improve startup time. This DLL will no longer be loaded at the start of every Python process.

.. bpo: 45732 .. date: 2021-12-05-23-52-03 .. nonce: -BWrnh .. section: macOS

Update python.org macOS installer to use Tcl/Tk 8.6.12.

.. bpo: 39026 .. date: 2021-11-09-15-42-11 .. nonce: sUnYWn .. section: C API

Fix Python.h to build C extensions with Xcode: remove a relative include from Include/cpython/pystate.h.