3.10.0a2 - Cpython — ContextQMD

.. bpo: 42103 .. date: 2020-10-23-19-19-30 .. nonce: cILT66 .. release date: 2020-11-03 .. section: Security

Prevented potential DoS attack via CPU and RAM exhaustion when processing malformed Apple Property List files in binary format.

.. bpo: 42051 .. date: 2020-10-19-10-56-27 .. nonce: EU_B7u .. section: Security

The :mod:plistlib module no longer accepts entity declarations in XML plist files to avoid XML vulnerabilities. This should not affect users as entity declarations are not used in regular plist files.

.. bpo: 42236 .. date: 2020-11-01-21-21-38 .. nonce: MPx-NK .. section: Core and Builtins

If the nl_langinfo(CODESET) function returns an empty string, Python now uses UTF-8 as the filesystem encoding. Patch by Victor Stinner.

.. bpo: 42218 .. date: 2020-10-31-17-50-23 .. nonce: Dp_Z3v .. section: Core and Builtins

Fixed a bug in the PEG parser that was causing crashes in debug mode. Now errors are checked in left-recursive rules to avoid cases where such errors do not get handled in time and appear as long-distance crashes in other places.

.. bpo: 42214 .. date: 2020-10-30-22-16-30 .. nonce: lXskM_ .. section: Core and Builtins

Fixed a possible crash in the PEG parser when checking for the '!=' token in the barry_as_flufl rule. Patch by Pablo Galindo.

.. bpo: 42206 .. date: 2020-10-30-13-11-01 .. nonce: xxssR8 .. section: Core and Builtins

Propagate and raise the errors caused by :c:func:PyAST_Validate in the parser.

.. bpo: 41796 .. date: 2020-10-29-12-49-08 .. nonce: tkGdHq .. section: Core and Builtins

The :mod:ast module internal state is now per interpreter. Patch by Victor Stinner.

.. bpo: 42143 .. date: 2020-10-27-21-34-05 .. nonce: N6KXUO .. section: Core and Builtins

Fix handling of errors during creation of PyFunctionObject, which resulted in operations on uninitialized memory. Patch by Yonatan Goldschmidt.

.. bpo: 41659 .. date: 2020-10-27-18-32-49 .. nonce: d4a-8o .. section: Core and Builtins

Fix a bug in the parser, where a curly brace following a primary didn't fail immediately. This led to invalid expressions like a {b} to throw a :exc:SyntaxError with a wrong offset, or invalid expressions ending with a curly brace like a { to not fail immediately in the REPL.

.. bpo: 42150 .. date: 2020-10-25-21-14-18 .. nonce: b70u_T .. section: Core and Builtins

Fix possible buffer overflow in the new parser when checking for continuation lines. Patch by Pablo Galindo.

.. bpo: 42123 .. date: 2020-10-23-02-43-24 .. nonce: 64gJWC .. section: Core and Builtins

Run the parser two times. On the first run, disable all the rules that only generate better error messages to gain performance. If there's a parse failure, run the parser a second time with those enabled.

.. bpo: 42093 .. date: 2020-10-20-04-24-07 .. nonce: ooZZNh .. section: Core and Builtins

The LOAD_ATTR instruction now uses new "per opcode cache" mechanism and it is about 36% faster now. Patch by Pablo Galindo and Yury Selivanov.

.. bpo: 42030 .. date: 2020-10-15-21-55-32 .. nonce: PmU2CA .. section: Core and Builtins

Support for the legacy AIX-specific shared library loading support has been removed. All versions of AIX since 4.3 have supported and defaulted to using the common Unix mechanism instead.

.. bpo: 41984 .. date: 2020-10-14-16-19-43 .. nonce: SEtKMr .. section: Core and Builtins

The garbage collector now tracks all user-defined classes. Patch by Brandt Bucher.

.. bpo: 41993 .. date: 2020-10-10-13-53-52 .. nonce: YMzixQ .. section: Core and Builtins

Fixed potential issues with removing not completely initialized module from sys.modules when import fails.

.. bpo: 41979 .. date: 2020-10-09-10-55-50 .. nonce: ImXIk2 .. section: Core and Builtins

Star-unpacking is now allowed for with item's targets in the PEG parser.

.. bpo: 41974 .. date: 2020-10-08-09-58-19 .. nonce: 8B-q8O .. section: Core and Builtins

Removed special methods __int__, __float__, __floordiv__, __mod__, __divmod__, __rfloordiv__, __rmod__ and __rdivmod__ of the :class:complex class. They always raised a :exc:TypeError.

.. bpo: 41902 .. date: 2020-10-02-13-32-05 .. nonce: ZKTxzW .. section: Core and Builtins

Micro optimization when compute :c:member:~PySequenceMethods.sq_item and :c:member:~PyMappingMethods.mp_subscript of :class:range. Patch by Donghee Na.

.. bpo: 41894 .. date: 2020-10-02-11-35-33 .. nonce: ffmtOt .. section: Core and Builtins

When loading a native module and a load failure occurs, prevent a possible UnicodeDecodeError when not running in a UTF-8 locale by decoding the load error message using the current locale's encoding.

.. bpo: 41902 .. date: 2020-10-01-22-44-23 .. nonce: iLoMVF .. section: Core and Builtins

Micro optimization for range.index if step is 1. Patch by Donghee Na.

.. bpo: 41435 .. date: 2020-08-07-13-42-48 .. nonce: qPWjJA .. section: Library

Add sys._current_exceptions() function to retrieve a dictionary mapping each thread's identifier to the topmost exception currently active in that thread at the time the function is called.

.. bpo: 38605 .. date: 2020-05-27-16-08-16 .. nonce: rcs2uK .. section: Core and Builtins

Enable from __future__ import annotations (:pep:563) by default. The values found in :attr:~object.__annotations__ dicts are now strings, for example {"x": "int"} instead of {"x": int}.

.. bpo: 35455 .. date: 2020-11-02-14-10-48 .. nonce: Q1xTIo .. section: Library

On Solaris, :func:~time.thread_time is now implemented with gethrvtime() because clock_gettime(CLOCK_THREAD_CPUTIME_ID) is not always available. Patch by Jakub Kulik.

.. bpo: 42233 .. date: 2020-11-02-01-31-15 .. nonce: YxRj-h .. section: Library

The :func:repr of :mod:typing types containing :ref:Generic Alias Types <types-genericalias> previously did not show the parameterized types in the GenericAlias. They have now been changed to do so.

.. bpo: 29566 .. date: 2020-10-31-13-28-36 .. nonce: 6aDbty .. section: Library

binhex.binhex() consistently writes macOS 9 line endings.

.. bpo: 26789 .. date: 2020-10-31-01-16-49 .. nonce: 9BdNAt .. section: Library

The :class:logging.FileHandler class now keeps a reference to the builtin :func:open function to be able to open or reopen the file during Python finalization. Fix errors like: NameError: name 'open' is not defined. Patch by Victor Stinner.

.. bpo: 42157 .. date: 2020-10-26-23-29-16 .. nonce: 4wuwTe .. section: Library

Removed the unicodedata.ucnhash_CAPI attribute which was an internal PyCapsule object. The related private _PyUnicode_Name_CAPI structure was moved to the internal C API. Patch by Victor Stinner.

.. bpo: 42157 .. date: 2020-10-26-19-08-07 .. nonce: Bdpa04 .. section: Library

Convert the :mod:unicodedata extension module to the multiphase initialization API (:pep:489) and convert the unicodedata.UCD static type to a heap type. Patch by Mohamed Koubaa and Victor Stinner.

.. bpo: 42146 .. date: 2020-10-25-19-25-02 .. nonce: 6A8uvS .. section: Library

Fix memory leak in :func:subprocess.Popen in case an uid (gid) specified in user (group, extra_groups) overflows uid_t (gid_t).

.. bpo: 42103 .. date: 2020-10-23-19-20-14 .. nonce: C5obK2 .. section: Library

:exc:~plistlib.InvalidFileException and :exc:RecursionError are now the only errors caused by loading malformed binary Plist file (previously ValueError and TypeError could be raised in some specific cases).

.. bpo: 41490 .. date: 2020-10-23-08-54-47 .. nonce: -Yk6OD .. section: Library

In importlib.resources, .path method is more aggressive about releasing handles to zipfile objects early, enabling use-cases like certifi to leave the context open but delete the underlying zip file.

.. bpo: 41052 .. date: 2020-10-21-23-45-02 .. nonce: 3N7J2J .. section: Library

Pickling heap types implemented in C with protocols 0 and 1 raises now an error instead of producing incorrect data.

.. bpo: 42089 .. date: 2020-10-19-16-53-19 .. nonce: R1dthW .. section: Library

In importlib.metadata.PackageNotFoundError, make reference to the package metadata being missing to improve the user experience.

.. bpo: 41491 .. date: 2020-10-19-14-02-09 .. nonce: d1BUWH .. section: Library

plistlib: fix parsing XML plists with hexadecimal integer values

.. bpo: 42065 .. date: 2020-10-17-23-17-18 .. nonce: 85BsRA .. section: Library

Fix an incorrectly formatted error from :meth:!_codecs.charmap_decode when called with a mapped value outside the range of valid Unicode code points. PR by Max Bernstein.

.. bpo: 41966 .. date: 2020-10-17-07-52-53 .. nonce: gwEQRZ .. section: Library

Fix pickling pure Python :class:datetime.time subclasses. Patch by Dean Inwood.

.. bpo: 19270 .. date: 2020-10-16-22-48-01 .. nonce: jd_gkA .. section: Library

:meth:sched.scheduler.cancel will now cancel the correct event, if two events with same priority are scheduled for the same time. Patch by Bar Harel.

.. bpo: 28660 .. date: 2020-10-16-16-08-04 .. nonce: eX9pvD .. section: Library

:func:textwrap.wrap now attempts to break long words after hyphens when break_long_words=True and break_on_hyphens=True.

.. bpo: 35823 .. date: 2020-10-16-07-45-35 .. nonce: SNQo56 .. section: Library

Use vfork() instead of fork() for :func:subprocess.Popen on Linux to improve performance in cases where it is deemed safe.

.. bpo: 42043 .. date: 2020-10-15-17-20-37 .. nonce: OS0p_v .. section: Library

Add support for zipfile.Path inheritance. zipfile.Path.is_file() now returns False for non-existent names. zipfile.Path objects now expose a .filename attribute and rely on that to resolve .name and .parent when the Path object is at the root of the zipfile.

.. bpo: 42021 .. date: 2020-10-12-21-21-24 .. nonce: 8yv_8- .. section: Library

Fix possible ref leaks in :mod:sqlite3 module init.

.. bpo: 39101 .. date: 2020-10-11-21-43-03 .. nonce: -I49Pm .. section: Library

Fixed tests using IsolatedAsyncioTestCase from hanging on BaseExceptions.

.. bpo: 41976 .. date: 2020-10-08-18-22-28 .. nonce: Svm0wb .. section: Library

Fixed a bug that was causing :func:ctypes.util.find_library to return None when triying to locate a library in an environment when gcc>=9 is available and ldconfig is not. Patch by Pablo Galindo

.. bpo: 41943 .. date: 2020-10-07-18-36-03 .. nonce: Pt55fT .. section: Library

Fix bug where TestCase.assertLogs doesn't correctly filter messages by level.

.. bpo: 41923 .. date: 2020-10-03-23-14-50 .. nonce: Buonw9 .. section: Library

Implement :pep:613, introducing :data:typing.TypeAlias annotation.

.. bpo: 41905 .. date: 2020-10-01-21-11-03 .. nonce: _JpjR4 .. section: Library

A new function in abc: update_abstractmethods to re-calculate an abstract class's abstract status. In addition, dataclass has been changed to call this function.

.. bpo: 23706 .. date: 2020-09-30-11-05-11 .. nonce: dHTGjF .. section: Library

Added newline parameter to pathlib.Path.write_text().

.. bpo: 41876 .. date: 2020-09-29-16-23-54 .. nonce: QicdDU .. section: Library

Tkinter font class repr uses font name

.. bpo: 41831 .. date: 2020-09-22-11-07-50 .. nonce: k-Eop_ .. section: Library

str() for the type attribute of the tkinter.Event object always returns now the numeric code returned by Tk instead of the name of the event type.

.. bpo: 39337 .. date: 2020-09-13-02-02-18 .. nonce: L3NXTt .. section: Library

:func:encodings.normalize_encoding now ignores non-ASCII characters.

.. bpo: 41747 .. date: 2020-09-08-23-41-29 .. nonce: M6wLKv .. section: Library

Ensure all methods that generated from :func:dataclasses.dataclass objects now have the proper __qualname__ attribute referring to the class they belong to. Patch by Batuhan Taskaya.

.. bpo: 30681 .. date: 2020-09-04-17-33-04 .. nonce: LR4fnY .. section: Library

Handle exceptions caused by unparsable date headers when using email "default" policy. Patch by Tim Bell, Georges Toth

.. bpo: 41586 .. date: 2020-08-19-08-32-13 .. nonce: IYjmjK .. section: Library

Add F_SETPIPE_SZ and F_GETPIPE_SZ to fcntl module. Allow setting pipesize on subprocess.Popen.

.. bpo: 41229 .. date: 2020-07-19-20-10-41 .. nonce: p8rJa2 .. section: Library

Add contextlib.aclosing for deterministic cleanup of async generators which is analogous to contextlib.closing for non-async generators. Patch by Joongi Kim and John Belmonte.

.. bpo: 16396 .. date: 2020-07-08-09-45-00 .. nonce: z8o8Pn .. section: Library

Allow ctypes.wintypes to be imported on non-Windows systems.

.. bpo: 4356 .. date: 2020-05-31-10-48-47 .. nonce: P8kXqp .. section: Library

Add a key function to the bisect module.

.. bpo: 40592 .. date: 2020-05-14-16-01-34 .. nonce: Cmk855 .. section: Library

:func:shutil.which now ignores empty entries in :envvar:PATHEXT instead of treating them as a match.

.. bpo: 40492 .. date: 2020-05-04-12-16-00 .. nonce: ONk9Na .. section: Library

Fix --outfile for :mod:!cProfile / :mod:!profile not writing the output file in the original directory when the program being profiled changes the working directory. PR by Anthony Sottile.

.. bpo: 34204 .. date: 2020-04-21-17-18-33 .. nonce: 9wXTtY .. section: Library

The :mod:shelve module now uses :const:pickle.DEFAULT_PROTOCOL by default instead of :mod:pickle protocol 3.

.. bpo: 27321 .. date: 2020-01-19-18-40-26 .. nonce: 8e6SpM .. section: Library

Fixed KeyError exception when flattening an email to a string attempts to replace a non-existent Content-Transfer-Encoding header.

.. bpo: 38976 .. date: 2019-12-05-05-22-49 .. nonce: 5MG7Uu .. section: Library

The :mod:http.cookiejar module now supports the parsing of cookies in CURL-style cookiejar files through MozillaCookieJar on all platforms. Previously, such cookie entries would be silently ignored when loading a cookiejar with such entries.

Additionally, the HTTP Only attribute is persisted in the object, and will be correctly written to file if the MozillaCookieJar object is subsequently dumped.

.. bpo: 42061 .. date: 2020-10-28-21-39-45 .. nonce: _x-0sg .. section: Documentation

Document format functionality for IP addresses.

.. bpo: 41910 .. date: 2020-10-21-14-40-54 .. nonce: CzBMit .. section: Documentation

Document the default implementation of object.__eq__.

.. bpo: 42010 .. date: 2020-10-21-02-21-14 .. nonce: 76vJ0u .. section: Documentation

Clarify that subscription expressions are also valid for certain :term:classes <class> and :term:types <type> in the standard library, and for user-defined classes and types if the classmethod :meth:__class_getitem__ is provided.

.. bpo: 41805 .. date: 2020-10-10-01-36-37 .. nonce: l-CGv5 .. section: Documentation

Documented :ref:generic alias type <types-genericalias> and :data:types.GenericAlias. Also added an entry in glossary for :term:generic types <generic type>.

.. bpo: 39693 .. date: 2020-02-24-09-02-05 .. nonce: QXw0Fm .. section: Documentation

Fix tarfile's extractfile documentation

.. bpo: 39416 .. date: 2020-01-22-05-14-53 .. nonce: uYjhEm .. section: Documentation

Document some restrictions on the default string representations of numeric classes.

.. bpo: 41739 .. date: 2020-10-12-00-11-47 .. nonce: wSCc4K .. section: Tests

Fix test_logging.test_race_between_set_target_and_flush(): the test now waits until all threads complete to avoid leaking running threads.

.. bpo: 41970 .. date: 2020-10-08-14-00-17 .. nonce: aZ8QFf .. section: Tests

Avoid a test failure in test_lib2to3 if the module has already imported at the time the test executes. Patch by Pablo Galindo.

.. bpo: 41944 .. date: 2020-10-05-17-43-46 .. nonce: rf1dYb .. section: Tests

Tests for CJK codecs no longer call eval() on content received via HTTP.

.. bpo: 41306 .. date: 2020-08-03-13-44-37 .. nonce: VDoWXI .. section: Tests

Fixed a failure in test_tk.test_widgets.ScaleTest happening when executing the test with Tk 8.6.10.

.. bpo: 38980 .. date: 2020-10-21-18-31-54 .. nonce: xz7BNd .. section: Build

Add -fno-semantic-interposition to both the compile and link line when building with --enable-optimizations. Patch by Victor Stinner and Pablo Galindo.

.. bpo: 38439 .. date: 2020-10-20-13-19-42 .. nonce: eMLi-t .. section: Windows

Updates the icons for IDLE in the Windows Store package.

.. bpo: 38252 .. date: 2020-10-18-18-43-45 .. nonce: 7Nlepg .. section: Windows

Use 8-byte step to detect ASCII sequence in 64-bit Windows build.

.. bpo: 39107 .. date: 2020-09-24-23-09-40 .. nonce: GbUZvD .. section: Windows

Update Tcl and Tk to 8.6.10 in Windows installer.

.. bpo: 41557 .. date: 2020-08-26-09-35-06 .. nonce: vt00cQ .. section: Windows

Update Windows installer to use SQLite 3.33.0.

.. bpo: 38324 .. date: 2020-05-30-02-46-43 .. nonce: 476M-5 .. section: Windows

Avoid Unicode errors when accessing certain locale data on Windows.

.. bpo: 41471 .. date: 2020-10-19-12-25-19 .. nonce: gwA7un .. section: macOS

Ignore invalid prefix lengths in system proxy excludes.

.. bpo: 33987 .. date: 2020-10-24-21-27-37 .. nonce: fIh9JL .. section: IDLE

Mostly finish using ttk widgets, mainly for editor, settings, and searches. Some patches by Mark Roseman.

.. bpo: 40511 .. date: 2020-06-16-12-16-13 .. nonce: XkihpM .. section: IDLE

Typing opening and closing parentheses inside the parentheses of a function call will no longer cause unnecessary "flashing" off and on of an existing open call-tip, e.g. when typed in a string literal.

.. bpo: 38439 .. date: 2020-04-22-09-37-40 .. nonce: ieXL-c .. section: IDLE

Add a 256×256 pixel IDLE icon to the Windows .ico file. Created by Andrew Clover. Remove the low-color gif variations from the .ico file.

.. bpo: 42157 .. date: 2020-10-16-10-47-17 .. nonce: e3BcPM .. section: C API

The private _PyUnicode_Name_CAPI structure of the PyCapsule API unicodedata.ucnhash_CAPI has been moved to the internal C API. Patch by Victor Stinner.

.. bpo: 42015 .. date: 2020-10-12-20-13-58 .. nonce: X4H2_V .. section: C API

Fix potential crash in deallocating method objects when dynamically allocated :c:type:PyMethodDef's lifetime is managed through the self argument of a :c:type:PyCFunction.

.. bpo: 40423 .. date: 2020-10-11-19-17-44 .. nonce: GsmgEj .. section: C API

The :mod:subprocess module and os.closerange will now use the close_range(low, high, flags) syscall when it is available for more efficient closing of ranges of descriptors.

.. bpo: 41845 .. date: 2020-10-11-05-05-53 .. nonce: ZFvuQM .. section: C API

:c:func:PyObject_GenericGetDict is available again in the limited API when targeting 3.10 or later.

.. bpo: 40422 .. date: 2020-10-10-14-05-24 .. nonce: sh8IDY .. section: C API

Add _Py_closerange function to provide performant closing of a range of file descriptors.

.. bpo: 41986 .. date: 2020-10-09-22-50-46 .. nonce: JUPE59 .. section: C API

:c:data:!Py_FileSystemDefaultEncodeErrors and :c:data:!Py_UTF8Mode are available again in limited API.

.. bpo: 41756 .. date: 2020-09-28-14-31-07 .. nonce: ZZ5wJG .. section: C API

Add PyIter_Send function to allow sending value into generator/coroutine/iterator without raising StopIteration exception to signal return.

.. bpo: 41784 .. date: 2020-09-14-10-17-00 .. nonce: Yl4gI2 .. section: C API

Added PyUnicode_AsUTF8AndSize to the limited C API.