3.10.0a4 - Cpython — ContextQMD

.. bpo: 42814 .. date: 2021-01-03-04-41-25 .. nonce: sDvVbb .. release date: 2021-01-04 .. section: Core and Builtins

Fix undefined behavior in Objects/genericaliasobject.c.

.. bpo: 42806 .. date: 2021-01-03-00-20-38 .. nonce: mLAobJ .. section: Core and Builtins

Fix the column offsets for f-strings :mod:ast nodes surrounded by parentheses and for nodes that spawn multiple lines. Patch by Pablo Galindo.

.. bpo: 40631 .. date: 2020-12-31-20-58-22 .. nonce: deRMCx .. section: Core and Builtins

Fix regression where a single parenthesized starred expression was a valid assignment target.

.. bpo: 27794 .. date: 2020-12-27-18-07-43 .. nonce: sxgfGi .. section: Core and Builtins

Improve the error message for failed writes/deletes to property objects. When possible, the attribute name is now shown. Patch provided by Yurii Karabas.

.. bpo: 42745 .. date: 2020-12-25-23-30-58 .. nonce: XsFoHS .. section: Core and Builtins

Make the type attribute lookup cache per-interpreter. Patch by Victor Stinner.

.. bpo: 42246 .. date: 2020-12-22-20-30-11 .. nonce: 7BrPLg .. section: Core and Builtins

Jumps to jumps are not eliminated when it would break PEP 626.

.. bpo: 42246 .. date: 2020-12-16-14-44-21 .. nonce: RtIEY7 .. section: Core and Builtins

Make sure that the f_lasti and f_lineno attributes of a frame are set correctly when an exception is raised or re-raised. Required for PEP 626.

.. bpo: 32381 .. date: 2020-12-15-18-43-43 .. nonce: 3tIofL .. section: Core and Builtins

The coding cookie (ex: # coding: latin1) is now ignored in the command passed to the :option:-c command line option. Patch by Victor Stinner.

.. bpo: 30858 .. date: 2020-12-13-15-23-09 .. nonce: -f9G4z .. section: Core and Builtins

Improve error location in expressions that contain assignments. Patch by Pablo Galindo and Lysandros Nikolaou.

.. bpo: 42615 .. date: 2020-12-10-17-06-52 .. nonce: Je6Q-r .. section: Core and Builtins

Remove jump commands made redundant by the deletion of unreachable bytecode blocks

.. bpo: 42639 .. date: 2020-12-09-01-55-10 .. nonce: 5pI5HG .. section: Library

Make the :mod:atexit module state per-interpreter. It is now safe have more than one :mod:atexit module instance. Patch by Donghee Na and Victor Stinner.

.. bpo: 32381 .. date: 2020-12-04-17-17-44 .. nonce: NY5t2S .. section: Core and Builtins

Fix encoding name when running a .pyc file on Windows: :c:func:PyRun_SimpleFileExFlags() now uses the correct encoding to decode the filename.

.. bpo: 42195 .. date: 2020-11-20-00-57-47 .. nonce: HeqcpS .. section: Library

The __args__ of the parameterized generics for :data:typing.Callable and :class:collections.abc.Callable are now consistent. The __args__ for :class:collections.abc.Callable are now flattened while :data:typing.Callable's have not changed. To allow this change, :class:types.GenericAlias can now be subclassed and collections.abc.Callable's __class_getitem__ will now return a subclass of types.GenericAlias. Tests for typing were also updated to not subclass things like Callable[..., T] as that is not a valid base class. Finally, both Callable\ s no longer validate their argtypes, in Callable[[argtypes], resulttype] to prepare for :pep:612. Patch by Ken Jin.

.. bpo: 40137 .. date: 2020-11-19-23-12-57 .. nonce: bihl9O .. section: Library

Convert functools module to use :c:func:PyType_FromModuleAndSpec.

.. bpo: 40077 .. date: 2020-11-03-13-46-10 .. nonce: NfAIdj .. section: Library

Convert :mod:array to use heap types, and establish module state for these.

.. bpo: 42008 .. date: 2020-10-12-14-51-59 .. nonce: ijWw2I .. section: Library

Fix _random.Random() seeding.

.. bpo: 1635741 .. date: 2020-09-12-19-21-52 .. nonce: F2kDrU .. section: Library

Port the :mod:pyexpat extension module to multi-phase initialization (:pep:489).

.. bpo: 40521 .. date: 2020-05-14-02-55-39 .. nonce: dIlXsZ .. section: Core and Builtins

Make the Unicode dictionary of interned strings compatible with subinterpreters. Patch by Victor Stinner.

.. bpo: 39465 .. date: 2020-05-13-18-50-27 .. nonce: j7nl6A .. section: Core and Builtins

Make :c:func:!_PyUnicode_FromId function compatible with subinterpreters. Each interpreter now has an array of identifier objects (interned strings decoded from UTF-8). Patch by Victor Stinner.

.. bpo: 42257 .. date: 2020-12-31-23-05-53 .. nonce: ALQy7B .. section: Library

Handle empty string in variable executable in platform.libc_ver()

.. bpo: 42772 .. date: 2020-12-30-17-16-43 .. nonce: Xe7WFV .. section: Library

randrange() now raises a TypeError when step is specified without a stop argument. Formerly, it silently ignored the step argument.

.. bpo: 42759 .. date: 2020-12-27-22-19-26 .. nonce: lGi_03 .. section: Library

Fixed equality comparison of :class:tkinter.Variable and :class:tkinter.font.Font. Objects which belong to different Tcl interpreters are now always different, even if they have the same name.

.. bpo: 42756 .. date: 2020-12-27-21-22-01 .. nonce: dHMPJ9 .. section: Library

Configure LMTP Unix-domain socket to use socket global default timeout when a timeout is not explicitly provided.

.. bpo: 23328 .. date: 2020-12-27-18-47-01 .. nonce: _xqepZ .. section: Library

Allow / character in username, password fields on _PROXY envars.

.. bpo: 42740 .. date: 2020-12-25-23-23-11 .. nonce: F0rQ_E .. section: Library

:func:typing.get_args and :func:typing.get_origin now support :pep:604 union types and :pep:612 additions to Callable.

.. bpo: 42655 .. date: 2020-12-25-12-32-47 .. nonce: W5ytpV .. section: Library

:mod:subprocess extra_groups is now correctly passed into setgroups() system call.

.. bpo: 42727 .. date: 2020-12-23-19-43-06 .. nonce: WH3ODh .. section: Library

EnumMeta.__prepare__ now accepts **kwds to properly support __init_subclass__

.. bpo: 38308 .. date: 2020-12-23-15-16-12 .. nonce: lB4Sv0 .. section: Library

Add optional weights to statistics.harmonic_mean().

.. bpo: 42721 .. date: 2020-12-22-22-47-22 .. nonce: I5Ai5L .. section: Library

When simple query dialogs (:mod:tkinter.simpledialog), message boxes (:mod:tkinter.messagebox) or color choose dialog (:mod:tkinter.colorchooser) are created without arguments master and parent, and the default root window is not yet created, and :func:~tkinter.NoDefaultRoot was not called, a new temporal hidden root window will be created automatically. It will not be set as the default root window and will be destroyed right after closing the dialog window. It will help to use these simple dialog windows in programs which do not need other GUI.

.. bpo: 25246 .. date: 2020-12-22-13-16-43 .. nonce: GhhCTl .. section: Library

Optimized :meth:collections.deque.remove.

.. bpo: 35728 .. date: 2020-12-21-23-34-57 .. nonce: 9m-azF .. section: Library

Added a root parameter to :func:tkinter.font.nametofont.

.. bpo: 15303 .. date: 2020-12-21-22-59-26 .. nonce: zozVrq .. section: Library

:mod:tkinter supports now widgets with boolean value False.

.. bpo: 42681 .. date: 2020-12-20-22-50-15 .. nonce: lDO6jb .. section: Library

Fixed range checks for color and pair numbers in :mod:curses.

.. bpo: 42685 .. date: 2020-12-19-17-32-43 .. nonce: kwZlwp .. section: Library

Improved placing of simple query windows in Tkinter (such as :func:tkinter.simpledialog.askinteger). They are now centered at the center of the parent window if it is specified and shown, otherwise at the center of the screen.

.. bpo: 9694 .. date: 2020-12-19-12-33-38 .. nonce: CkKK9V .. section: Library

Argparse help no longer uses the confusing phrase, "optional arguments". It uses "options" instead.

.. bpo: 1635741 .. date: 2020-12-16-23-28-52 .. nonce: Quy3zn .. section: Library

Port the :mod:!_thread extension module to the multiphase initialization API (:pep:489) and convert its static types to heap types.

.. bpo: 37961 .. date: 2020-12-16-16-16-33 .. nonce: jrESEq .. section: Library

Fix crash in :func:tracemalloc.Traceback.__repr__ (regressed in Python 3.9).

.. bpo: 42630 .. date: 2020-12-15-17-51-27 .. nonce: jf4jBl .. section: Library

:mod:tkinter functions and constructors which need a default root window raise now :exc:RuntimeError with descriptive message instead of obscure :exc:AttributeError or :exc:NameError if it is not created yet or cannot be created automatically.

.. bpo: 42639 .. date: 2020-12-15-15-14-29 .. nonce: uJ3h8I .. section: Library

:func:atexit._run_exitfuncs now logs callback exceptions using :data:sys.unraisablehook, rather than logging them directly into :data:sys.stderr and raise the last exception.

.. bpo: 42644 .. date: 2020-12-15-10-00-04 .. nonce: XgLCNx .. section: Library

logging.disable will now validate the types and value of its parameter. It also now accepts strings representing the levels (as does logging.setLevel) instead of only the numerical values.

.. bpo: 42639 .. date: 2020-12-14-22-31-22 .. nonce: 5Z3iWX .. section: Library

At Python exit, if a callback registered with :func:atexit.register fails, its exception is now logged. Previously, only some exceptions were logged, and the last exception was always silently ignored.

.. bpo: 36541 .. date: 2020-12-14-08-23-57 .. nonce: qdEtZv .. section: Library

Fixed lib2to3.pgen2 to be able to parse PEP-570 positional only argument syntax.

.. bpo: 42382 .. date: 2020-12-13-22-05-35 .. nonce: 2YtKo5 .. section: Library

In importlib.metadata: - EntryPoint objects now expose a .dist object referencing the Distribution when constructed from a Distribution. - Add support for package discovery under package normalization rules. - The object returned by metadata() now has a formally defined protocol called PackageMetadata with declared support for the .get_all() method. - Synced with importlib_metadata 3.3.

.. bpo: 41877 .. date: 2020-12-10-19-49-52 .. nonce: wiVlPc .. section: Library

A check is added against misspellings of autospect, auto_spec and set_spec being passed as arguments to patch, patch.object and create_autospec.

.. bpo: 39717 .. date: 2020-12-10-18-36-52 .. nonce: sK2u0w .. section: Library

[tarfile] update nested exception raising to use from None or from e

.. bpo: 41877 .. date: 2020-12-10-09-24-44 .. nonce: iJSCvM .. section: Library

AttributeError for suspected misspellings of assertions on mocks are now pointing out that the cause are misspelled assertions and also what to do if the misspelling is actually an intended attribute name. The unittest.mock document is also updated to reflect the current set of recognised misspellings.

.. bpo: 41559 .. date: 2020-12-10-00-09-40 .. nonce: 1l4yjP .. section: Library

Implemented :pep:612: added ParamSpec and Concatenate to :mod:typing. Patch by Ken Jin.

.. bpo: 42385 .. date: 2020-12-09-19-45-32 .. nonce: boGbjo .. section: Library

StrEnum: fix generate_next_value to return a str

.. bpo: 31904 .. date: 2020-12-09-15-23-28 .. nonce: g3k5k3 .. section: Library

Define THREAD_STACK_SIZE for VxWorks.

.. bpo: 34750 .. date: 2020-12-09-14-15-48 .. nonce: x8TASR .. section: Library

[Enum] _EnumDict.update() is now supported.

.. bpo: 42517 .. date: 2020-12-09-10-59-16 .. nonce: FKEVcZ .. section: Library

Enum: private names do not become members / do not generate errors -- they remain normal attributes

.. bpo: 42678 .. date: 2020-12-08-22-43-35 .. nonce: ba9ktU .. section: Library

Enum: call __init_subclass__ after members have been added

.. bpo: 28964 .. date: 2020-12-07-13-21-00 .. nonce: UTQikc .. section: Library

:func:ast.literal_eval adds line number information (if available) in error message for malformed nodes.

.. bpo: 42470 .. date: 2020-12-06-12-00-00 .. nonce: iqtC4L .. section: Library

:func:random.sample no longer warns on a sequence which is also a set.

.. bpo: 31904 .. date: 2020-11-27-18-09-59 .. nonce: g8k43d .. section: Library

:func:posixpath.expanduser returns the input path unchanged if user home directory is None on VxWorks.

.. bpo: 42388 .. date: 2020-11-22-11-22-28 .. nonce: LMgM6B .. section: Library

Fix subprocess.check_output(..., input=None) behavior when text=True to be consistent with that of the documentation and universal_newlines=True.

.. bpo: 34463 .. date: 2020-11-20-19-00-27 .. nonce: aJcm56 .. section: Library

Fixed discrepancy between :mod:traceback and the interpreter in formatting of SyntaxError with lineno not set (:mod:traceback was changed to match interpreter).

.. bpo: 42393 .. date: 2020-11-17-22-06-15 .. nonce: BB0oXc .. section: Library

Raise :exc:OverflowError instead of silent truncation in :meth:socket.ntohs and :meth:socket.htons. Silent truncation was deprecated in Python 3.7. Patch by Erlend E. Aasland

.. bpo: 42222 .. date: 2020-10-31-10-28-32 .. nonce: Cfl1eR .. section: Library

Harmonized :func:random.randrange argument handling to match :func:range.

The integer test and conversion in randrange() now uses :func:operator.index.
Non-integer arguments to randrange() are deprecated.
The ValueError is deprecated in favor of a TypeError.
It now runs a little faster than before.

(Contributed by Raymond Hettinger and Serhiy Storchaka.)

.. bpo: 42163 .. date: 2020-10-29-09-22-56 .. nonce: O4VcCY .. section: Library

Restore compatibility for uname_result around deepcopy and _replace.

.. bpo: 42090 .. date: 2020-10-25-14-48-57 .. nonce: Ubuc0j .. section: Library

zipfile.Path.joinpath now accepts arbitrary arguments, same as pathlib.Path.joinpath.

.. bpo: 1635741 .. date: 2020-10-20-23-28-55 .. nonce: Iyka3r .. section: Library

Port the _csv module to the multi-phase initialization API (:pep:489).

.. bpo: 42059 .. date: 2020-10-17-12-42-08 .. nonce: ZGMZ3D .. section: Library

:class:typing.TypedDict types created using the alternative call-style syntax now correctly respect the total keyword argument when setting their __required_keys__ and __optional_keys__ class attributes.

.. bpo: 41960 .. date: 2020-10-06-23-59-20 .. nonce: icQ7Xd .. section: Library

Add globalns and localns parameters to the :func:inspect.signature and :meth:inspect.Signature.from_callable.

.. bpo: 41907 .. date: 2020-10-02-10-19-49 .. nonce: wiIEsz .. section: Library

fix format() behavior for IntFlag

.. bpo: 41891 .. date: 2020-09-30-13-35-29 .. nonce: pNAeYI .. section: Library

Ensure asyncio.wait_for waits for task completion

.. bpo: 24792 .. date: 2020-09-11-16-07-00 .. nonce: Z-ARra .. section: Library

Fixed bug where :mod:zipimporter sometimes reports an incorrect cause of import errors.

.. bpo: 31904 .. date: 2020-08-11-17-44-07 .. nonce: cb13ea .. section: Library

Fix site and sysconfig modules for VxWorks RTOS which has no home directories.

.. bpo: 41462 .. date: 2020-08-03-17-54-32 .. nonce: ek38d_ .. section: Library

Add :func:os.set_blocking support for VxWorks RTOS.

.. bpo: 40219 .. date: 2020-07-13-19-43-11 .. nonce: MUoJEP .. section: Library

Lowered :class:tkinter.ttk.LabeledScale dummy widget to prevent hiding part of the content label.

.. bpo: 37193 .. date: 2020-06-12-21-23-20 .. nonce: wJximU .. section: Library

Fixed memory leak in socketserver.ThreadingMixIn introduced in Python 3.7.

.. bpo: 39068 .. date: 2019-12-16-17-55-31 .. nonce: Ti3f9P .. section: Library

Fix initialization race condition in :func:a85encode and :func:b85encode in :mod:base64. Patch by Brandon Stansbury.

.. bpo: 17140 .. date: 2020-12-16-21-06-16 .. nonce: 1leSEg .. section: Documentation

Add documentation for the :class:multiprocessing.pool.ThreadPool class.

.. bpo: 34398 .. date: 2019-03-04-18-51-21 .. nonce: YedUqW .. section: Documentation

Prominently feature listings from the glossary in documentation search results. Patch by Ammar Askar.

.. bpo: 42794 .. date: 2021-01-01-08-52-36 .. nonce: -7-XGz .. section: Tests

Update test_nntplib to use official group name of news.aioe.org for testing. Patch by Donghee Na.

.. bpo: 31904 .. date: 2020-12-17-15-42-44 .. nonce: d8g3l0d5 .. section: Tests

Skip some asyncio tests on VxWorks.

.. bpo: 42641 .. date: 2020-12-15-17-38-04 .. nonce: uzwlF_ .. section: Tests

Enhance test_select.test_select(): it now takes 500 milliseconds rather than 10 seconds. Use Python rather than a shell to make the test more portable.

.. bpo: 31904 .. date: 2020-12-09-15-23-28 .. nonce: ghj38d .. section: Tests

Skip some tests in _test_all_chown_common() on VxWorks.

.. bpo: 42199 .. date: 2020-10-29-21-26-46 .. nonce: KksGCV .. section: Tests

Fix bytecode helper assertNotInBytecode.

.. bpo: 41443 .. date: 2020-07-30-18-43-05 .. nonce: 834gyg .. section: Tests

Add more attribute checking in test_posix.py

.. bpo: 31904 .. date: 2020-07-30-18-06-15 .. nonce: y3d8dk .. section: Tests

Disable os.popen and impacted tests on VxWorks

.. bpo: 41439 .. date: 2020-07-30-14-08-58 .. nonce: yhteoi .. section: Tests

Port test_ssl and test_uuid to VxWorks RTOS.

.. bpo: 42692 .. date: 2021-01-04-05-07-30 .. nonce: OO11SN .. section: Build

Fix __builtin_available check on older compilers. Patch by Joshua Root.

.. bpo: 27640 .. date: 2020-12-22-17-57-04 .. nonce: j3a8r0 .. section: Build

Added --disable-test-modules option to the configure script: don't build nor install test modules. Patch by Xavier de Gaye, Thomas Petazzoni and Peixing Xin.

.. bpo: 42604 .. date: 2020-12-20-02-35-28 .. nonce: gRd89w .. section: Build

Now all platforms use a value for the "EXT_SUFFIX" build variable derived from SOABI (for instance in freeBSD, "EXT_SUFFIX" is now ".cpython-310d.so" instead of ".so"). Previously only Linux, Mac and VxWorks were using a value for "EXT_SUFFIX" that included "SOABI".

.. bpo: 42598 .. date: 2020-12-13-14-43-10 .. nonce: 7ipr5H .. section: Build

Fix implicit function declarations in configure which could have resulted in incorrect configuration checks. Patch contributed by Joshua Root.

.. bpo: 31904 .. date: 2020-12-11-18-04-38 .. nonce: j3j6d8 .. section: Build

Enable libpython3.so for VxWorks.

.. bpo: 29076 .. date: 2020-02-28-14-33-15 .. nonce: Gtixi5 .. section: Build

Add fish shell support to macOS installer.

.. bpo: 42361 .. date: 2021-01-04-01-17-17 .. nonce: eolZAi .. section: macOS

Update macOS installer build to use Tcl/Tk 8.6.11 (rc2, expected to be final release).

.. bpo: 41837 .. date: 2021-01-04-00-48-08 .. nonce: dX-unJ .. section: macOS

Update macOS installer build to use OpenSSL 1.1.1i.

.. bpo: 42584 .. date: 2020-12-07-11-37-35 .. nonce: LygmqQ .. section: macOS

Update macOS installer to use SQLite 3.34.0.

.. bpo: 42726 .. date: 2020-12-23-19-42-11 .. nonce: a5EkTv .. section: Tools/Demos

Fixed Python 3 compatibility issue with gdb/libpython.py handling of attribute dictionaries.

.. bpo: 42613 .. date: 2020-12-16-09-10-32 .. nonce: J-jnm5 .. section: Tools/Demos

Fix freeze.py tool to use the prope config and library directories. Patch by Victor Stinner.

.. bpo: 42591 .. date: 2020-12-10-10-43-03 .. nonce: CXNY8G .. section: C API

Export the :c:func:Py_FrozenMain function: fix a Python 3.9.0 regression. Python 3.9 uses -fvisibility=hidden and the function was not exported explicitly and so not exported.

.. bpo: 32381 .. date: 2020-12-09-00-35-25 .. nonce: Je08Ny .. section: C API

Remove the private :c:func:!_Py_fopen function which is no longer needed. Use :c:func:!_Py_wfopen or :c:func:!_Py_fopen_obj instead. Patch by Victor Stinner.

.. bpo: 1635741 .. date: 2020-11-22-13-46-06 .. nonce: -fJLzA .. section: C API

Port :mod:resource extension module to module state

.. bpo: 42111 .. date: 2020-10-21-18-43-06 .. nonce: 9pvtrc .. section: C API

Update the xxlimited module to be a better example of how to use the limited C API.

.. bpo: 40052 .. date: 2020-03-24-09-27-10 .. nonce: 27P2KG .. section: C API

Fix an alignment build warning/error in function PyVectorcall_Function(). Patch by Andreas Schneider, Antoine Pitrou and Petr Viktorin.