Python 3.10.0a6

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+.. bpo: 42967
+.. date: 2021-02-14-15-59-16
+.. nonce: YApqDS
+.. release date: 2021-03-01
+.. section: Security
+
+Fix web cache poisoning vulnerability by defaulting the query args separator
+to ``&``, and allowing the user to choose a custom separator.
+
+..
+
+.. bpo: 43321
+.. date: 2021-02-26-13-17-52
+.. nonce: TCS3ph
+.. section: Core and Builtins
+
+Fix ``SystemError`` raised when ``PyArg_Parse*()`` is used with ``#`` but
+without ``PY_SSIZE_T_CLEAN`` defined.
+
+..
+
+.. bpo: 36346
+.. date: 2021-02-22-19-00-00
+.. nonce: uAoni0
+.. section: Core and Builtins
+
+``PyArg_Parse*()`` functions now emits ``DeprecationWarning`` when ``u`` or
+``Z`` format is used. See :pep:`623` for detail.
+
+..
+
+.. bpo: 43277
+.. date: 2021-02-20-16-50-22
+.. nonce: FXkRXk
+.. section: Core and Builtins
+
+Add a new :c:func:`PySet_CheckExact` function to the C-API to check if an
+object is an instance of :class:`set` but not an instance of a subtype.
+Patch by Pablo Galindo.
+
+..
+
+.. bpo: 42990
+.. date: 2021-02-18-15-12-30
+.. nonce: toAqBH
+.. section: Core and Builtins
+
+The :data:`types.FunctionType` constructor now inherits the current builtins
+if the *globals* dictionary has no ``"__builtins__"`` key, rather than using
+``{"None": None}`` as builtins: same behavior as :func:`eval` and
+:func:`exec` functions. Defining a function with ``def function(...): ...``
+in Python is not affected, globals cannot be overriden with this syntax: it
+also inherits the current builtins. Patch by Victor Stinner.
+
+..
+
+.. bpo: 42990
+.. date: 2021-02-17-19-02-21
+.. nonce: SKXHiI
+.. section: Core and Builtins
+
+Functions have a new ``__builtins__`` attribute which is used to look for
+builtin symbols when a function is executed, instead of looking into
+``__globals__['__builtins__']``. Patch by Mark Shannon and Victor Stinner.
+
+..
+
+.. bpo: 43149
+.. date: 2021-02-07-03-27-14
+.. nonce: 0umPKD
+.. section: Core and Builtins
+
+Improve the error message in the parser for exception groups without
+parentheses. Patch by Pablo Galindo.
+
+..
+
+.. bpo: 43121
+.. date: 2021-02-03-22-33-05
+.. nonce: jqcViq
+.. section: Core and Builtins
+
+Fixed an incorrect :exc:`SyntaxError` message for missing comma in literals.
+Patch by Pablo Galindo.
+
+..
+
+.. bpo: 42819
+.. date: 2021-01-04-23-54-34
+.. nonce: 4KO6wU
+.. section: Core and Builtins
+
+:mod:`readline`: Explicitly disable bracketed paste in the interactive
+interpreter, even if it's set in the inputrc, is enabled by default (eg GNU
+Readline 8.1), or a user calls ``readline.read_init_file()``. The Python
+REPL has not implemented bracketed paste support. Also, bracketed mode
+writes the ``"\x1b[?2004h"`` escape sequence into stdout which causes test
+failures in applications that don't support it. It can still be explicitly
+enabled by calling ``readline.parse_and_bind("set enable-bracketed-paste
+on")``. Patch by Dustin Rodrigues.
+
+..
+
+.. bpo: 42808
+.. date: 2021-01-02-05-10-58
+.. nonce: AOxgxl
+.. section: Core and Builtins
+
+Simple calls to ``type(object)`` are now faster due to the ``vectorcall``
+calling convention. Patch by Dennis Sweeney.
+
+..
+
+.. bpo: 42217
+.. date: 2020-10-31-16-54-00
+.. nonce: GdcHe5
+.. section: Core and Builtins
+
+Make the compiler merges same co_code and co_linetable objects in a module
+like already did for co_consts.
+
+..
+
+.. bpo: 41972
+.. date: 2020-10-23-23-17-23
+.. nonce: kbAwg4
+.. section: Core and Builtins
+
+Substring search functions such as ``str1 in str2`` and ``str2.find(str1)``
+now sometimes use the "Two-Way" string comparison algorithm to avoid
+quadratic behavior on long strings.
+
+..
+
+.. bpo: 42128
+.. date: 2020-10-23-08-54-04
+.. nonce: SWmVEm
+.. section: Core and Builtins
+
+Implement :pep:`634` (structural pattern matching). Patch by Brandt Bucher.
+
+..
+
+.. bpo: 40692
+.. date: 2020-05-19-22-10-05
+.. nonce: ajEhrR
+.. section: Core and Builtins
+
+In the :class:`concurrent.futures.ProcessPoolExecutor`, validate that
+:func:`multiprocess.synchronize` is available on a given platform and rely
+on that check in the :mod:`concurrent.futures` test suite so we can run
+tests that are unrelated to :class:`ProcessPoolExecutor` on those platforms.
+
+..
+
+.. bpo: 38302
+.. date: 2019-09-28-12-23-23
+.. nonce: hsCNgX
+.. section: Core and Builtins
+
+If :func:`object.__ipow__` returns :const:`NotImplemented`, the operator
+will correctly fall back to :func:`object.__pow__` and
+:func:`object.__rpow__` as expected.
+
+..
+
+.. bpo: 43316
+.. date: 2021-02-25-09-44-36
+.. nonce: k9Gyqn
+.. section: Library
+
+The ``python -m gzip`` command line application now properly fails when
+detecting an unsupported extension. It exits with a non-zero exit code and
+prints an error message to stderr.
+
+..
+
+.. bpo: 43317
+.. date: 2021-02-25-09-08-55
+.. nonce: qrOOpB
+.. section: Library
+
+Set the chunk size for the ``gzip`` module main function to
+io.DEFAULT_BUFFER_SIZE. This is slightly faster than the 1024 bytes constant
+that was used previously.
+
+..
+
+.. bpo: 43146
+.. date: 2021-02-23-17-20-16
+.. nonce: JAFplg
+.. section: Library
+
+Handle None in single-arg versions of :func:`~traceback.print_exception` and
+:func:`~traceback.format_exception`.
+
+..
+
+.. bpo: 43260
+.. date: 2021-02-20-12-15-29
+.. nonce: 6znAas
+.. section: Library
+
+Fix TextIOWrapper can not flush internal buffer forever after very large
+text is written.
+
+..
+
+.. bpo: 43258
+.. date: 2021-02-18-23-30-52
+.. nonce: LeU-q8
+.. section: Library
+
+Prevent needless allocation of :mod:`sqlite3` aggregate function context
+when no rows match an aggregate query. Patch by Erlend E. Aasland.
+
+..
+
+.. bpo: 43251
+.. date: 2021-02-18-14-24-42
+.. nonce: n6WZDw
+.. section: Library
+
+Improve :mod:`sqlite3` error handling: ``sqlite3_column_name()`` failures
+now result in :exc:`MemoryError`. Patch by Erlend E. Aasland.
+
+..
+
+.. bpo: 40956
+.. date: 2021-02-10-23-29-50
+.. nonce: LcAbwG
+.. section: Library
+
+Fix segfault in :meth:`sqlite3.Connection.backup` if no argument was
+provided. The regression was introduced by GH-23838. Patch by Erlend E.
+Aasland.
+
+..
+
+.. bpo: 43172
+.. date: 2021-02-10-06-00-53
+.. nonce: ZMCJni
+.. section: Library
+
+The readline module now passes its tests when built directly against
+libedit. Existing irreconcilable API differences remain in
+:func:`readline.get_begidx` and :func:`readline.get_endidx` behavior based
+on libreadline vs libedit use.
+
+..
+
+.. bpo: 43163
+.. date: 2021-02-08-21-13-51
+.. nonce: E2MgzH
+.. section: Library
+
+Fix a bug in :mod:`codeop` that was causing it to not ask for more input
+when multi-line snippets have unclosed parentheses. Patch by Pablo Galindo
+
+..
+
+.. bpo: 43162
+.. date: 2021-02-08-16-27-00
+.. nonce: t-W7h3
+.. section: Library
+
+deprecate unsupported ability to access enum members as attributes of other
+enum members
+
+..
+
+.. bpo: 43146
+.. date: 2021-02-06-21-21-35
+.. nonce: MHtb2v
+.. section: Library
+
+Fix recent regression in None argument handling in :mod:`~traceback` module
+functions.
+
+..
+
+.. bpo: 43102
+.. date: 2021-02-03-22-55-27
+.. nonce: TSlZ6J
+.. section: Library
+
+The namedtuple __new__ method had its __builtins__ set to None instead of an
+actual dictionary.  This created problems for introspection tools.
+
+..
+
+.. bpo: 43106
+.. date: 2021-02-03-17-06-38
+.. nonce: SwcSuU
+.. section: Library
+
+Added :data:`~os.O_EVTONLY`, :data:`~os.O_FSYNC`, :data:`~os.O_SYMLINK` and
+:data:`~os.O_NOFOLLOW_ANY` for macOS. Patch by Dong-hee Na.
+
+..
+
+.. bpo: 42960
+.. date: 2021-01-18-21-07-20
+.. nonce: a7Dote
+.. section: Library
+
+Adds :data:`resource.RLIMIT_KQUEUES` constant from FreeBSD to the
+:mod:`resource` module.
+
+..
+
+.. bpo: 42151
+.. date: 2020-10-26-18-01-09
+.. nonce: et5f7s
+.. section: Library
+
+Make the pure Python implementation of :mod:`xml.etree.ElementTree` behave
+the same as the C implementation (:mod:`_elementree`) regarding default
+attribute values (by not setting ``specified_attributes=1``).
+
+..
+
+.. bpo: 29753
+.. date: 2020-05-02-01-01-30
+.. nonce: n2M-AF
+.. section: Library
+
+In ctypes, now packed bitfields are calculated properly and the first item
+of packed bitfields is now shrank correctly.
+
+..
+
+.. bpo: 27646
+.. date: 2021-02-20-00-09-13
+.. nonce: HRsmo-
+.. section: Documentation
+
+Clarify that 'yield from <expr>' works with any iterable, not just
+iterators.
+
+..
+
+.. bpo: 36346
+.. date: 2020-06-15-10-45-45
+.. nonce: H0sS_i
+.. section: Documentation
+
+Update some deprecated unicode APIs which are documented as "will be removed
+in 4.0" to "3.12". See :pep:`623` for detail.
+
+..
+
+.. bpo: 43288
+.. date: 2021-02-21-11-11-53
+.. nonce: LfTvL-
+.. section: Tests
+
+Fix test_importlib to correctly skip Unicode file tests if the fileystem
+does not support them.
+
+..
+
+.. bpo: 43174
+.. date: 2021-02-10-14-11-53
+.. nonce: F9zwXQ
+.. section: Build
+
+Windows build now uses ``/utf-8`` compiler option.
+
+..
+
+.. bpo: 43103
+.. date: 2021-02-02-16-26-44
+.. nonce: VWeyP_
+.. section: Build
+
+Add a new configure ``--without-static-libpython`` option to not build the
+``libpythonMAJOR.MINOR.a`` static library and not install the ``python.o``
+object file.
+
+..
+
+.. bpo: 13501
+.. date: 2021-01-10-22-25-23
+.. nonce: g4L-6R
+.. section: Build
+
+The configure script can now use *libedit* instead of *readline* with the
+command line option ``--with-readline=editline``.
+
+..
+
+.. bpo: 42603
+.. date: 2020-12-08-19-25-20
+.. nonce: mXs2dB
+.. section: Build
+
+Make configure script use pkg-config to detect the location of Tcl/Tk
+headers and libraries, used to build tkinter.
+
+On macOS, a Tcl/Tk configuration provided by pkg-config will be preferred
+over Tcl/Tk frameworks installed in ``/{System/,}Library/Frameworks``. If
+both exist and the latter is preferred, the appropriate ``--with-tcltk-*``
+configuration options need to be explicitly set.
+
+..
+
+.. bpo: 39448
+.. date: 2020-01-24-12-54-22
+.. nonce: k4pv14
+.. section: Build
+
+Add the "regen-frozen" makefile target that regenerates the code for the
+frozen ``__hello__`` module.
+
+..
+
+.. bpo: 43155
+.. date: 2021-02-10-04-16-51
+.. nonce: O1tURk
+.. section: Windows
+
+:c:func:`PyCMethod_New` is now present in ``python3.lib``.
+
+..
+
+.. bpo: 41837
+.. date: 2021-02-28-22-49-46
+.. nonce: 9fqyXC
+.. section: macOS
+
+Update macOS installer build to use OpenSSL 1.1.1j.
+
+..
+
+.. bpo: 43283
+.. date: 2021-02-21-16-30-10
+.. nonce: DLBwYn
+.. section: IDLE
+
+Document why printing to IDLE's Shell is often slower than printing to a
+system terminal and that it can be made faster by pre-formatting a single
+string before printing.
+
+..
+
+.. bpo: 43278
+.. date: 2021-02-21-15-30-38
+.. nonce: DMPaWH
+.. section: C API
+
+Always put compiler and system information on the first line of the REPL
+welcome message.
+
+..
+
+.. bpo: 43270
+.. date: 2021-02-19-14-28-26
+.. nonce: UKx4XN
+.. section: C API
+
+Remove the private ``_PyErr_OCCURRED()`` macro: use the public
+:c:func:`PyErr_Occurred` function instead.
+
+..
+
+.. bpo: 35134
+.. date: 2021-02-18-18-46-42
+.. nonce: dFpEDT
+.. section: C API
+
+Move odictobject.h, parser_interface.h, picklebufobject.h, pydebug.h, and
+pyfpe.h into the cpython/ directory. They must not be included directly, as
+they are already included by Python.h: :ref:`Include Files <api-includes>`.
+
+..
+
+.. bpo: 35134
+.. date: 2021-02-17-18-51-26
+.. nonce: YoQdk8
+.. section: C API
+
+Move pyarena.h, pyctype.h, and pytime.h into the cpython/ directory. They
+must not be included directly, as they are already included by Python.h:
+:ref:`Include Files <api-includes>`.
+
+..
+
+.. bpo: 40170
+.. date: 2021-02-16-22-29-39
+.. nonce: ahHmOo
+.. section: C API
+
+:c:func:`PyExceptionClass_Name` is now always declared as a function, in
+order to hide implementation details. The macro accessed
+:c:member:`PyTypeObject.tp_name` directly.  Patch by Erlend E. Aasland.
+
+..
+
+.. bpo: 43239
+.. date: 2021-02-16-17-30-16
+.. nonce: FQqOGz
+.. section: C API
+
+The :c:func:`PyCFunction_New` function is now exported in the ABI when
+compiled with ``-fvisibility=hidden``.
+
+..
+
+.. bpo: 40170
+.. date: 2021-02-15-15-06-43
+.. nonce: ZYeSii
+.. section: C API
+
+:c:func:`PyIter_Check` is now always declared as a function, in order to
+hide implementation details. The macro accessed
+:c:member:`PyTypeObject.tp_iternext` directly. Patch by Erlend E. Aasland.
+
+..
+
+.. bpo: 40170
+.. date: 2021-02-15-13-41-14
+.. nonce: r2FAtl
+.. section: C API
+
+Convert :c:func:`PyDescr_IsData` macro to a function to hide implementation
+details: The macro accessed :c:member:`PyTypeObject.tp_descr_set` directly.
+Patch by Erlend E. Aasland.
+
+..
+
+.. bpo: 43181
+.. date: 2021-02-11-11-37-14
+.. nonce: ydv33S
+.. section: C API
+
+Convert :c:func:`PyObject_TypeCheck` macro to a static inline function.
+Patch by Erlend E. Aasland.