3.10.0a5 - Cpython — ContextQMD

.. bpo: 42938 .. date: 2021-01-18-09-27-31 .. nonce: 4Zn4Mp .. release date: 2021-02-02 .. section: Security

Avoid static buffers when computing the repr of :class:ctypes.c_double and :class:ctypes.c_longdouble values.

.. bpo: 42990 .. date: 2021-01-30-11-31-44 .. nonce: 69h_zK .. section: Core and Builtins

Refactor the PyEval_ family of functions.

An new function _PyEval_Vector is added to simplify calls to Python from C.
_PyEval_EvalCodeWithName is removed
PyEval_EvalCodeEx is retained as part of the API, but is not used internally

.. bpo: 38631 .. date: 2021-01-29-17-48-44 .. nonce: jR-3kC .. section: Core and Builtins

Replace :c:func:Py_FatalError calls in the compiler with regular :exc:SystemError exceptions. Patch by Victor Stinner.

.. bpo: 42997 .. date: 2021-01-24-20-19-55 .. nonce: QUOPgP .. section: Core and Builtins

Improve error message for missing ":" before blocks. Patch by Pablo Galindo.

.. bpo: 43017 .. date: 2021-01-24-18-02-05 .. nonce: emEcXX .. section: Core and Builtins

Improve error message in the parser when using un-parenthesised tuples in comprehensions. Patch by Pablo Galindo.

.. bpo: 42986 .. date: 2021-01-20-23-44-15 .. nonce: sWoaGf .. section: Core and Builtins

Fix parser crash when reporting syntax errors in f-string with newlines. Patch by Pablo Galindo.

.. bpo: 40176 .. date: 2021-01-20-22-31-01 .. nonce: anjyWw .. section: Core and Builtins

Syntax errors for unterminated string literals now point to the start of the string instead of reporting EOF/EOL.

.. bpo: 42927 .. date: 2021-01-15-20-05-56 .. nonce: GI-l-7 .. section: Core and Builtins

The inline cache for LOAD_ATTR now also optimizes access to attributes defined by __slots__. This makes reading such attribute up to 30% faster.

.. bpo: 42864 .. date: 2021-01-14-23-15-34 .. nonce: QgOAQ1 .. section: Core and Builtins

Improve error messages in the parser when parentheses are not closed. Patch by Pablo Galindo.

.. bpo: 42924 .. date: 2021-01-13-14-06-01 .. nonce: _WS1Ok .. section: Core and Builtins

Fix bytearray repetition incorrectly copying data from the start of the buffer, even if the data is offset within the buffer (e.g. after reassigning a slice at the start of the bytearray to a shorter byte string).

.. bpo: 42882 .. date: 2021-01-11-17-58-52 .. nonce: WfTdfg .. section: Core and Builtins

Fix the :c:func:!_PyUnicode_FromId function (_Py_IDENTIFIER(var) API) when :c:func:Py_Initialize / :c:func:Py_Finalize is called multiple times: preserve _PyRuntime.unicode_ids.next_index value.

.. bpo: 42827 .. date: 2021-01-06-17-06-37 .. nonce: jtRR0D .. section: Core and Builtins

Fix a crash when working out the error line of a :exc:SyntaxError in some multi-line expressions.

.. bpo: 42823 .. date: 2021-01-04-18-17-07 .. nonce: dcSynu .. section: Core and Builtins

frame.f_lineno is correct even if frame.f_trace is set to True

.. bpo: 37324 .. date: 2020-12-12-20-09-12 .. nonce: jB-9_U .. section: Library

Remove deprecated aliases to :ref:collections-abstract-base-classes from the :mod:collections module.

.. bpo: 41994 .. date: 2020-10-10-14-16-03 .. nonce: Xop8sV .. section: Core and Builtins

Fixed possible leak in import when sys.modules is not a dict.

.. bpo: 27772 .. date: 2018-12-20-23-59-23 .. nonce: idHEcj .. section: Core and Builtins

In string formatting, preceding the width field by '0' no longer affects the default alignment for strings.

.. bpo: 43108 .. date: 2021-02-02-20-23-31 .. nonce: lqcCZ6 .. section: Library

Fixed a reference leak in the :mod:curses module. Patch by Pablo Galindo

.. bpo: 43077 .. date: 2021-01-30-15-20-06 .. nonce: Owk61z .. section: Library

Update the bundled pip to 21.0.1 and setuptools to 52.0.0.

.. bpo: 41282 .. date: 2021-01-27-20-49-32 .. nonce: SEPdV0 .. section: Library

Deprecate distutils in documentation and add warning on import.

.. bpo: 43014 .. date: 2021-01-24-00-37-40 .. nonce: BVPhEr .. section: Library

Improve performance of :mod:tokenize by 20-30%. Patch by Anthony Sottile.

.. bpo: 42323 .. date: 2021-01-20-12-10-47 .. nonce: PONB8e .. section: Library

Fix :func:math.nextafter for NaN on AIX.

.. bpo: 42955 .. date: 2021-01-18-11-59-46 .. nonce: CSWLC9 .. section: Library

Add :data:sys.stdlib_module_names, containing the list of the standard library module names. Patch by Victor Stinner.

.. bpo: 42944 .. date: 2021-01-18-10-41-44 .. nonce: RrONvy .. section: Library

Fix random.Random.sample when counts argument is not None.

.. bpo: 42934 .. date: 2021-01-15-11-48-00 .. nonce: ILKoOI .. section: Library

Use :class:~traceback.TracebackException's new compact param in :class:~unittest.TestResult to reduce time and memory consumed by traceback formatting.

.. bpo: 42931 .. date: 2021-01-15-00-23-50 .. nonce: QD6U2B .. section: Library

Add :func:randbytes to random.__all__.

.. bpo: 38250 .. date: 2021-01-14-15-07-16 .. nonce: 1fvhOk .. section: Library

[Enum] Flags consisting of a single bit are now considered canonical, and will be the only flags returned from listing and iterating over a Flag class or a Flag member. Multi-bit flags are considered aliases; they will be returned from lookups and operations that result in their value. Iteration for both Flag and Flag members is in definition order.

.. bpo: 42877 .. date: 2021-01-13-12-55-41 .. nonce: Fi1zEG .. section: Library

Added the compact parameter to the constructor of :class:traceback.TracebackException to reduce time and memory for use cases that only need to call :func:TracebackException.format and :func:TracebackException.format_exception_only.

.. bpo: 42923 .. date: 2021-01-13-12-15-13 .. nonce: zBiNls .. section: Library

The :c:func:Py_FatalError function and the :mod:faulthandler module now dump the list of extension modules on a fatal error.

.. bpo: 42848 .. date: 2021-01-12-19-34-06 .. nonce: 5G8oBl .. section: Library

Removed recursion from :class:~traceback.TracebackException to allow it to handle long exception chains.

.. bpo: 42901 .. date: 2021-01-11-17-36-59 .. nonce: gFd-ta .. section: Library

[Enum] move member creation from EnumMeta.__new__ to _proto_member.__set_name__, allowing members to be created and visible in __init_subclass__.

.. bpo: 42780 .. date: 2021-01-08-15-49-20 .. nonce: rtqi6B .. section: Library

Fix os.set_inheritable() for O_PATH file descriptors on Linux.

.. bpo: 42866 .. date: 2021-01-08-10-57-21 .. nonce: Y1DnrO .. section: Library

Fix a reference leak in the getcodec() function of CJK codecs. Patch by Victor Stinner.

.. bpo: 42846 .. date: 2021-01-07-23-31-17 .. nonce: kukDjw .. section: Library

Convert the 6 CJK codec extension modules (_codecs_cn, _codecs_hk, _codecs_iso2022, _codecs_jp, _codecs_kr and _codecs_tw) to the multiphase initialization API (:pep:489). Patch by Victor Stinner.

.. bpo: 42851 .. date: 2021-01-07-11-44-22 .. nonce: uyQFyd .. section: Library

remove init_subclass support for Enum members

.. bpo: 42834 .. date: 2021-01-05-23-55-24 .. nonce: LxRnZC .. section: Library

Make internal caches of the _json module compatible with subinterpreters.

.. bpo: 41748 .. date: 2021-01-05-21-26-29 .. nonce: KdC0w3 .. section: Library

Fix HTMLParser parsing rules for element attributes containing commas with spaces. Patch by Karl Dubost.

.. bpo: 40810 .. date: 2021-01-05-00-52-30 .. nonce: JxQqPe .. section: Library

Require SQLite 3.7.15 or newer. Patch by Erlend E. Aasland.

.. bpo: 1635741 .. date: 2021-01-04-15-05-40 .. nonce: EOCfZY .. section: Library

Convert the _multibytecodec extension module (CJK codecs) to multi-phase initialization (:pep:489). Patch by Erlend E. Aasland.

.. bpo: 42802 .. date: 2021-01-01-15-29-16 .. nonce: Lw-bzl .. section: Library

The distutils bdist_wininst command deprecated in Python 3.8 has been removed. The distutils bdist_wheel command is now recommended to distribute binary packages on Windows.

.. bpo: 24464 .. date: 2020-12-30-14-56-25 .. nonce: vbNVHe .. section: Library

The undocumented built-in function sqlite3.enable_shared_cache is now deprecated, scheduled for removal in Python 3.12. Its use is strongly discouraged by the SQLite3 documentation. Patch by Erlend E. Aasland.

.. bpo: 42384 .. date: 2020-11-17-14-32-39 .. nonce: 1ZnQSn .. section: Library

Make pdb populate sys.path[0] exactly the same as regular python execution.

.. bpo: 42383 .. date: 2020-11-17-14-30-12 .. nonce: ubl0Y_ .. section: Library

Fix pdb: previously pdb would fail to restart the debugging target if it was specified using a relative path and the current directory changed.

.. bpo: 42005 .. date: 2020-10-11-13-48-03 .. nonce: Jq6Az- .. section: Library

Fix CLI of :mod:!cProfile and :mod:!profile to catch :exc:BrokenPipeError.

.. bpo: 41604 .. date: 2020-08-21-15-24-14 .. nonce: rTXleO .. section: Library

Don't decrement the reference count of the previous user_ptr when set_panel_userptr fails.

.. bpo: 41149 .. date: 2020-06-28-16-13-02 .. nonce: jiZWtJ .. section: Library

Allow executing callables that have a boolean value of False when passed to :class:Threading.thread as the target. Patch contributed by Barney Stratford.

.. bpo: 38307 .. date: 2020-03-16-03-03-21 .. nonce: 2cmw2i .. section: Library

Add an 'end_lineno' attribute to the Class and Function objects that appear in the tree returned by pyclbr functions. This and the existing 'lineno' attribute define the extent of class and def statements. Patch by Aviral Srivastava.

.. bpo: 39273 .. date: 2020-01-13-23-37-58 .. nonce: m5hzxV .. section: Library

The BUTTON5_* constants are now exposed in the :mod:curses module if available.

.. bpo: 33289 .. date: 2018-04-23-13-44-10 .. nonce: anBnUr .. section: Library

Correct call to :mod:tkinter.colorchooser to return RGB triplet of ints instead of floats. Patch by Cheryl Sabella.

.. bpo: 40304 .. date: 2021-01-20-23-03-49 .. nonce: -LK7Ps .. section: Documentation

Fix doc for type(name, bases, dict). Patch by Boris Verkhovskiy and Éric Araujo.

.. bpo: 42811 .. date: 2021-01-04-22-14-22 .. nonce: HY2beA .. section: Documentation

Updated importlib.util.resolve_name() doc to use spec.parent instead of package. (Thanks Yair Frid.)

.. bpo: 40823 .. date: 2020-05-30-13-39-22 .. nonce: yB7K5w .. section: Tests

Use :meth:unittest.TestLoader().loadTestsFromTestCase instead of :meth:unittest.makeSuite in :mod:sqlite3 tests. Patch by Erlend E. Aasland.

.. bpo: 40810 .. date: 2020-05-30-10-56-38 .. nonce: LPqDLQ .. section: Tests

In :mod:sqlite3, fix CheckTraceCallbackContent for SQLite pre 3.7.15.

.. bpo: 43031 .. date: 2021-01-26-14-48-40 .. nonce: 44nK9U .. section: Build

Pass --timeout=$(TESTTIMEOUT) option to the default profile task ./python -m test --pgo command.

.. bpo: 36143 .. date: 2021-01-18-20-52-06 .. nonce: kgnIYo .. section: Build

make regen-all now also runs regen-keyword. Patch by Victor Stinner.

.. bpo: 42874 .. date: 2021-01-12-10-06-50 .. nonce: XKK61g .. section: Build

Removed the grep -q and -E flags in the tzpath validation section of the configure script to better accommodate users of some platforms (specifically Solaris 10).

.. bpo: 31904 .. date: 2021-01-11-23-26-00 .. nonce: ty8f3h .. section: Build

Add library search path by wr-cc in add_cross_compiling_paths() for VxWorks.

.. bpo: 42856 .. date: 2021-01-07-12-51-38 .. nonce: n3cMHV .. section: Build

Add --with-wheel-pkg-dir=PATH option to the ./configure script. If specified, the :mod:ensurepip module looks for setuptools and pip wheel packages in this directory: if both are present, these wheel packages are used instead of ensurepip bundled wheel packages.

Some Linux distribution packaging policies recommend against bundling dependencies. For example, Fedora installs wheel packages in the /usr/share/python-wheels/ directory and don't install the ensurepip._bundled package.

.. bpo: 41837 .. date: 2021-01-05-20-36-40 .. nonce: bmS7vB .. section: Windows

Updated Windows installer to include OpenSSL 1.1.1i

.. bpo: 42584 .. date: 2020-12-07-11-40-52 .. nonce: AsYnVX .. section: Windows

Upgrade Windows installer to use SQLite 3.34.0.

.. bpo: 42504 .. date: 2021-01-26-14-36-11 .. nonce: ZxWt71 .. section: macOS

Ensure that the value of sysconfig.get_config_var('MACOSX_DEPLOYMENT_TARGET') is always a string, even in when the value is parsable as an integer.

.. bpo: 43008 .. date: 2021-01-26-18-12-17 .. nonce: mbQUc7 .. section: IDLE

Make IDLE invoke :func:sys.excepthook in normal, 2-process mode. Patch by Ken Hilton.

.. bpo: 33065 .. date: 2021-01-10-01-25-43 .. nonce: zmyHYJ .. section: IDLE

Fix problem debugging user classes with repr method.

.. bpo: 23544 .. date: 2019-11-14-23-41-07 .. nonce: 3etemb .. section: IDLE

Disable Debug=>Stack Viewer when user code is running or Debugger is active, to prevent hang or crash. Patch by Zackery Spytz.

.. bpo: 32631 .. date: 2019-06-30-20-31-09 .. nonce: e7_4BG .. section: IDLE

Finish zzdummy example extension module: make menu entries work; add docstrings and tests with 100% coverage.

.. bpo: 42979 .. date: 2021-01-28-01-11-59 .. nonce: JrGkrm .. section: C API

When Python is built in debug mode (with C assertions), calling a type slot like sq_length (__len__() in Python) now fails with a fatal error if the slot succeeded with an exception set, or failed with no exception set. The error message contains the slot, the type name, and the current exception (if an exception is set). Patch by Victor Stinner.

.. bpo: 43030 .. date: 2021-01-27-10-27-47 .. nonce: loDcD_ .. section: C API

Fixed a compiler warning in :c:func:Py_UNICODE_ISSPACE() on platforms with signed :c:type:wchar_t.