安全性

• bpo-42967 [https://bugs.python.org/issue?@action=redirect&bpo=42967]: Fix web cache poisoning vulnerability by defaulting the query args separator to &, and allowing the user to choose a custom separator.

核心与内置函数

• bpo-43321 [https://bugs.python.org/issue?@action=redirect&bpo=43321]: Fix SystemError raised when PyArg_Parse*() is used with # but without PY_SSIZE_T_CLEAN defined.

• bpo-36346 [https://bugs.python.org/issue?@action=redirect&bpo=36346]: PyArg_Parse*() functions now emits DeprecationWarning when u or Z format is used. See PEP 623 [https://peps.python.org/pep-0623/] for detail.

• bpo-43277 [https://bugs.python.org/issue?@action=redirect&bpo=43277]: Add a new PySet_CheckExact() function to the C-API to check if an object is an instance of set but not an instance of a subtype. Patch by Pablo Galindo.

• bpo-42990 [https://bugs.python.org/issue?@action=redirect&bpo=42990]: The 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 eval() and exec() functions. Defining a function with def function(…): … in Python is not affected, globals cannot be overridden with this syntax: it also inherits the current builtins. Patch by Victor Stinner.

• bpo-42990 [https://bugs.python.org/issue?@action=redirect&bpo=42990]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=43149]: Improve the error message in the parser for exception groups without parentheses. Patch by Pablo Galindo.

• bpo-43121 [https://bugs.python.org/issue?@action=redirect&bpo=43121]: Fixed an incorrect SyntaxError message for missing comma in literals. Patch by Pablo Galindo.

• bpo-42819 [https://bugs.python.org/issue?@action=redirect&bpo=42819]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=42808]: Simple calls to type(object) are now faster due to the vectorcall calling convention. Patch by Dennis Sweeney.

• bpo-42217 [https://bugs.python.org/issue?@action=redirect&bpo=42217]: Make the compiler merges same co_code and co_linetable objects in a module like already did for co_consts.

• bpo-41972 [https://bugs.python.org/issue?@action=redirect&bpo=41972]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=42128]: Implement PEP 634 [https://peps.python.org/pep-0634/] (structural pattern matching). Patch by Brandt Bucher.

• bpo-40692 [https://bugs.python.org/issue?@action=redirect&bpo=40692]: In the concurrent.futures.ProcessPoolExecutor, validate that multiprocess.synchronize() is available on a given platform and rely on that check in the concurrent.futures test suite so we can run tests that are unrelated to ProcessPoolExecutor on those platforms.

• bpo-38302 [https://bugs.python.org/issue?@action=redirect&bpo=38302]: If object.__ipow__() returns NotImplemented, the operator will correctly fall back to object.__pow__() and object.__rpow__() as expected.

库

• bpo-43316 [https://bugs.python.org/issue?@action=redirect&bpo=43316]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=43317]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=43146]: Handle None in single-arg versions of print_exception() and format_exception().

• bpo-43260 [https://bugs.python.org/issue?@action=redirect&bpo=43260]: Fix TextIOWrapper can not flush internal buffer forever after very large text is written.

• bpo-43258 [https://bugs.python.org/issue?@action=redirect&bpo=43258]: Prevent needless allocation of sqlite3 aggregate function context when no rows match an aggregate query. Patch by Erlend E. Aasland.

• bpo-43251 [https://bugs.python.org/issue?@action=redirect&bpo=43251]: Improve sqlite3 error handling: sqlite3_column_name() failures now result in MemoryError. Patch by Erlend E. Aasland.

• bpo-40956 [https://bugs.python.org/issue?@action=redirect&bpo=40956]: Fix segfault in sqlite3.Connection.backup() if no argument was provided. The regression was introduced by PR 23838. Patch by Erlend E. Aasland.

• bpo-43172 [https://bugs.python.org/issue?@action=redirect&bpo=43172]: The readline module now passes its tests when built directly against libedit. Existing irreconcilable API differences remain in readline.get_begidx() and readline.get_endidx() behavior based on libreadline vs libedit use.

• bpo-43163 [https://bugs.python.org/issue?@action=redirect&bpo=43163]: Fix a bug in codeop that was causing it to not ask for more input when multiline snippets have unclosed parentheses. Patch by Pablo Galindo

• bpo-43162 [https://bugs.python.org/issue?@action=redirect&bpo=43162]: deprecate unsupported ability to access enum members as attributes of other enum members

• bpo-43146 [https://bugs.python.org/issue?@action=redirect&bpo=43146]: Fix recent regression in None argument handling in traceback module functions.

• bpo-43102 [https://bugs.python.org/issue?@action=redirect&bpo=43102]: The namedtuple new method had its builtins set to None instead of an actual dictionary. This created problems for introspection tools.

• bpo-43106 [https://bugs.python.org/issue?@action=redirect&bpo=43106]: Added O_EVTONLY, O_FSYNC, O_SYMLINK and O_NOFOLLOW_ANY for macOS. Patch by Donghee Na.

• bpo-42960 [https://bugs.python.org/issue?@action=redirect&bpo=42960]: Adds resource.RLIMIT_KQUEUES constant from FreeBSD to the resource module.

• bpo-42151 [https://bugs.python.org/issue?@action=redirect&bpo=42151]: Make the pure Python implementation of xml.etree.ElementTree behave the same as the C implementation (_elementree) regarding default attribute values (by not setting specified_attributes=1).

• bpo-29753 [https://bugs.python.org/issue?@action=redirect&bpo=29753]: In ctypes, now packed bitfields are calculated properly and the first item of packed bitfields is now shrank correctly.

文档

• bpo-27646 [https://bugs.python.org/issue?@action=redirect&bpo=27646]: Clarify that 'yield from ' works with any iterable, not just iterators.

• bpo-36346 [https://bugs.python.org/issue?@action=redirect&bpo=36346]: Update some deprecated unicode APIs which are documented as "will be removed in 4.0" to "3.12". See PEP 623 [https://peps.python.org/pep-0623/] for detail.

测试

• bpo-43288 [https://bugs.python.org/issue?@action=redirect&bpo=43288]: Fix test_importlib to correctly skip Unicode file tests if the filesystem does not support them.

构建

• bpo-43174 [https://bugs.python.org/issue?@action=redirect&bpo=43174]: Windows build now uses /utf-8 compiler option.

• bpo-43103 [https://bugs.python.org/issue?@action=redirect&bpo=43103]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=13501]: The configure script can now use libedit instead of readline with the command line option --with-readline=editline.

• bpo-42603 [https://bugs.python.org/issue?@action=redirect&bpo=42603]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=39448]: Add the "regen-frozen" makefile target that regenerates the code for the frozen __hello__ module.

Windows

• bpo-43155 [https://bugs.python.org/issue?@action=redirect&bpo=43155]: PyCMethod_New() is now present in python3.lib.

macOS

• bpo-41837 [https://bugs.python.org/issue?@action=redirect&bpo=41837]: Update macOS installer build to use OpenSSL 1.1.1j.

IDLE

• bpo-43283 [https://bugs.python.org/issue?@action=redirect&bpo=43283]: 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.

C API

• bpo-43278 [https://bugs.python.org/issue?@action=redirect&bpo=43278]: Always put compiler and system information on the first line of the REPL welcome message.

• bpo-43270 [https://bugs.python.org/issue?@action=redirect&bpo=43270]: Remove the private PyErrOCCURRED() macro: use the public PyErr_Occurred() function instead.

• bpo-35134 [https://bugs.python.org/issue?@action=redirect&bpo=35134]: 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: Include Files.

• bpo-35134 [https://bugs.python.org/issue?@action=redirect&bpo=35134]: 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: Include Files.

• bpo-40170 [https://bugs.python.org/issue?@action=redirect&bpo=40170]: PyExceptionClass_Name() is now always declared as a function, in order to hide implementation details. The macro accessed PyTypeObject.tp_name directly. Patch by Erlend E. Aasland.

• bpo-43239 [https://bugs.python.org/issue?@action=redirect&bpo=43239]: The PyCFunction_New() function is now exported in the ABI when compiled with -fvisibility=hidden.

• bpo-40170 [https://bugs.python.org/issue?@action=redirect&bpo=40170]: PyIter_Check() is now always declared as a function, in order to hide implementation details. The macro accessed PyTypeObject.tp_iternext directly. Patch by Erlend E. Aasland.

• bpo-40170 [https://bugs.python.org/issue?@action=redirect&bpo=40170]: Convert PyDescr_IsData() macro to a function to hide implementation details: The macro accessed PyTypeObject.tp_descr_set directly. Patch by Erlend E. Aasland.

• bpo-43181 [https://bugs.python.org/issue?@action=redirect&bpo=43181]: Convert PyObject_TypeCheck() macro to a static inline function. Patch by Erlend E. Aasland.

Python 3.10.0 alpha 5

发布日期: 2021-02-02

安全性

• bpo-42938 [https://bugs.python.org/issue?@action=redirect&bpo=42938]: Avoid static buffers when computing the repr of ctypes.c_double and ctypes.c_longdouble values.

核心与内置函数

• bpo-42990 [https://bugs.python.org/issue?@action=redirect&bpo=42990]: Refactor the PyEval_ family of functions.

  • An new function PyEvalVector is added to simplify calls to Python from C.

  • PyEvalEvalCodeWithName is removed

  • PyEval_EvalCodeEx is retained as part of the API, but is not used internally

• bpo-38631 [https://bugs.python.org/issue?@action=redirect&bpo=38631]: Replace Py_FatalError() calls in the compiler with regular SystemError exceptions. Patch by Victor Stinner.

• bpo-42997 [https://bugs.python.org/issue?@action=redirect&bpo=42997]: Improve error message for missing ":" before blocks. Patch by Pablo Galindo.

• bpo-43017 [https://bugs.python.org/issue?@action=redirect&bpo=43017]: Improve error message in the parser when using un-parenthesised tuples in comprehensions. Patch by Pablo Galindo.

• bpo-42986 [https://bugs.python.org/issue?@action=redirect&bpo=42986]: Fix parser crash when reporting syntax errors in fstring with newlines. Patch by Pablo Galindo.

• bpo-40176 [https://bugs.python.org/issue?@action=redirect&bpo=40176]: Syntax errors for unterminated string literals now point to the start of the string instead of reporting EOF/EOL.

• bpo-42927 [https://bugs.python.org/issue?@action=redirect&bpo=42927]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=42864]: Improve error messages in the parser when parentheses are not closed. Patch by Pablo Galindo.

• bpo-42924 [https://bugs.python.org/issue?@action=redirect&bpo=42924]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=42882]: Fix the PyUnicodeFromId() function (PyIDENTIFIER(var) API) when Py_Initialize() / Py_Finalize() is called multiple times: preserve PyRuntime.unicodeids.next_index value.

• bpo-42827 [https://bugs.python.org/issue?@action=redirect&bpo=42827]: Fix a crash when working out the error line of a SyntaxError in some multiline expressions.

• bpo-42823 [https://bugs.python.org/issue?@action=redirect&bpo=42823]: frame.f_lineno is correct even if frame.f_trace is set to True

• bpo-37324 [https://bugs.python.org/issue?@action=redirect&bpo=37324]: Remove deprecated aliases to 容器抽象基类 from the collections module.

• bpo-41994 [https://bugs.python.org/issue?@action=redirect&bpo=41994]: Fixed possible leak in import when sys.modules is not a dict.

• bpo-27772 [https://bugs.python.org/issue?@action=redirect&bpo=27772]: In string formatting, preceding the width field by '0' no longer affects the default alignment for strings.

库

• bpo-43108 [https://bugs.python.org/issue?@action=redirect&bpo=43108]: Fixed a reference leak in the curses module. Patch by Pablo Galindo

• bpo-43077 [https://bugs.python.org/issue?@action=redirect&bpo=43077]: Update the bundled pip to 21.0.1 and setuptools to 52.0.0.

• bpo-41282 [https://bugs.python.org/issue?@action=redirect&bpo=41282]: Deprecate distutils in documentation and add warning on import.

• bpo-43014 [https://bugs.python.org/issue?@action=redirect&bpo=43014]: Improve performance of tokenize by 20-30%. Patch by Anthony Sottile.

• bpo-42323 [https://bugs.python.org/issue?@action=redirect&bpo=42323]: Fix math.nextafter() for NaN on AIX.

• bpo-42955 [https://bugs.python.org/issue?@action=redirect&bpo=42955]: Add sys.stdlib_module_names, containing the list of the standard library module names. Patch by Victor Stinner.

• bpo-42944 [https://bugs.python.org/issue?@action=redirect&bpo=42944]: Fix random.Random.sample when counts argument is not None.

• bpo-42934 [https://bugs.python.org/issue?@action=redirect&bpo=42934]: Use TracebackException's new compact param in TestResult to reduce time and memory consumed by traceback formatting.

• bpo-42931 [https://bugs.python.org/issue?@action=redirect&bpo=42931]: Add randbytes() to random.__all__.

• bpo-38250 [https://bugs.python.org/issue?@action=redirect&bpo=38250]: [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 [https://bugs.python.org/issue?@action=redirect&bpo=42877]: Added the compact parameter to the constructor of traceback.TracebackException to reduce time and memory for use cases that only need to call TracebackException.format() and TracebackException.format_exception_only().

• bpo-42923 [https://bugs.python.org/issue?@action=redirect&bpo=42923]: The Py_FatalError() function and the faulthandler module now dump the list of extension modules on a fatal error.

• bpo-42848 [https://bugs.python.org/issue?@action=redirect&bpo=42848]: Removed recursion from TracebackException to allow it to handle long exception chains.

• bpo-42901 [https://bugs.python.org/issue?@action=redirect&bpo=42901]: [Enum] move member creation from EnumMeta._new_ to protomember._setname__, allowing members to be created and visible in __init_subclass__.

• bpo-42780 [https://bugs.python.org/issue?@action=redirect&bpo=42780]: Fix os.set_inheritable() for O_PATH file descriptors on Linux.

• bpo-42866 [https://bugs.python.org/issue?@action=redirect&bpo=42866]: Fix a reference leak in the getcodec() function of CJK codecs. Patch by Victor Stinner.

• bpo-42846 [https://bugs.python.org/issue?@action=redirect&bpo=42846]: Convert the 6 CJK codec extension modules (codecscn, codecshk, codecsiso2022, codecsjp, codecskr and codecstw) to the multiphase initialization API ( PEP 489 [https://peps.python.org/pep-0489/]). Patch by Victor Stinner.

• bpo-42851 [https://bugs.python.org/issue?@action=redirect&bpo=42851]: remove init_subclass support for Enum members

• bpo-42834 [https://bugs.python.org/issue?@action=redirect&bpo=42834]: Make internal caches of the _json module compatible with subinterpreters.

• bpo-41748 [https://bugs.python.org/issue?@action=redirect&bpo=41748]: Fix HTMLParser parsing rules for element attributes containing commas with spaces. Patch by Karl Dubost.

• bpo-40810 [https://bugs.python.org/issue?@action=redirect&bpo=40810]: Require SQLite 3.7.15 or newer. Patch by Erlend E. Aasland.

• bpo-1635741 [https://bugs.python.org/issue?@action=redirect&bpo=1635741]: Convert the _multibytecodec extension module (CJK codecs) to multiphase initialization ( PEP 489 [https://peps.python.org/pep-0489/]). Patch by Erlend E. Aasland.

• bpo-42802 [https://bugs.python.org/issue?@action=redirect&bpo=42802]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=24464]: The undocumented builtin 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 [https://bugs.python.org/issue?@action=redirect&bpo=42384]: Make pdb populate sys.path[0] exactly the same as regular python execution.

• bpo-42383 [https://bugs.python.org/issue?@action=redirect&bpo=42383]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=42005]: Fix CLI of cProfile and profile to catch BrokenPipeError.

• bpo-41604 [https://bugs.python.org/issue?@action=redirect&bpo=41604]: Don't decrement the reference count of the previous user_ptr when set_panel_userptr fails.

• bpo-41149 [https://bugs.python.org/issue?@action=redirect&bpo=41149]: Allow executing callables that have a boolean value of False when passed to Threading.thread as the target. Patch contributed by Barney Stratford.

• bpo-38307 [https://bugs.python.org/issue?@action=redirect&bpo=38307]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=39273]: The BUTTON5_* constants are now exposed in the curses module if available.

• bpo-33289 [https://bugs.python.org/issue?@action=redirect&bpo=33289]: Correct call to tkinter.colorchooser to return RGB triplet of ints instead of floats. Patch by Cheryl Sabella.

文档

• bpo-40304 [https://bugs.python.org/issue?@action=redirect&bpo=40304]: Fix doc for type(name, bases, dict). Patch by Boris Verkhovskiy and Éric Araujo.

• bpo-42811 [https://bugs.python.org/issue?@action=redirect&bpo=42811]: Updated importlib.util.resolvename() doc to use spec.parent instead of _package. (Thanks Yair Frid.)

测试

• bpo-40823 [https://bugs.python.org/issue?@action=redirect&bpo=40823]: Use unittest.TestLoader().loadTestsFromTestCase() instead of unittest.makeSuite() in sqlite3 tests. Patch by Erlend E. Aasland.

• bpo-40810 [https://bugs.python.org/issue?@action=redirect&bpo=40810]: In sqlite3, fix CheckTraceCallbackContent for SQLite pre 3.7.15.

构建

• bpo-43031 [https://bugs.python.org/issue?@action=redirect&bpo=43031]: Pass --timeout=$(TESTTIMEOUT) option to the default profile task ./python -m test --pgo command.

• bpo-36143 [https://bugs.python.org/issue?@action=redirect&bpo=36143]: make regen-all now also runs regen-keyword. Patch by Victor Stinner.

• bpo-42874 [https://bugs.python.org/issue?@action=redirect&bpo=42874]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=31904]: Add library search path by wr-cc in add_cross_compiling_paths() for VxWorks.

• bpo-42856 [https://bugs.python.org/issue?@action=redirect&bpo=42856]: Add --with-wheel-pkg-dir=PATH option to the ./configure script. If specified, the 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.

某些 Linux 发行版的打包策略建议不要绑定依赖关系。比如 Fedora 在 usrshare/python-wheels/ 目录下安装 wheel 包，而不安装 ensurepip._bundled 包。

Windows

• bpo-41837 [https://bugs.python.org/issue?@action=redirect&bpo=41837]: Updated Windows installer to include OpenSSL 1.1.1i

• bpo-42584 [https://bugs.python.org/issue?@action=redirect&bpo=42584]: Upgrade Windows installer to use SQLite 3.34.0.

macOS

• bpo-42504 [https://bugs.python.org/issue?@action=redirect&bpo=42504]: Ensure that the value of sysconfig.getconfigvar('MACOSX_DEPLOYMENT_TARGET') is always a string, even in when the value is parsable as an integer.

IDLE

• bpo-43008 [https://bugs.python.org/issue?@action=redirect&bpo=43008]: Make IDLE invoke sys.excepthook() in normal, 2-process mode. Patch by Ken Hilton.

• bpo-33065 [https://bugs.python.org/issue?@action=redirect&bpo=33065]: Fix problem debugging user classes with repr method.

• bpo-23544 [https://bugs.python.org/issue?@action=redirect&bpo=23544]: Disable Debug=>Stack Viewer when user code is running or Debugger is active, to prevent hang or crash. Patch by Zackery Spytz.

• bpo-32631 [https://bugs.python.org/issue?@action=redirect&bpo=32631]: Finish zzdummy example extension module: make menu entries work; add docstrings and tests with 100% coverage.

C API

• bpo-42979 [https://bugs.python.org/issue?@action=redirect&bpo=42979]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=43030]: Fixed a compiler warning in Py_UNICODE_ISSPACE() on platforms with signed wchar_t.

Python 3.10.0 alpha 4

发布日期: 2021-01-04

核心与内置函数

• bpo-42814 [https://bugs.python.org/issue?@action=redirect&bpo=42814]: Fix undefined behavior in Objects/genericaliasobject.c.

• bpo-42806 [https://bugs.python.org/issue?@action=redirect&bpo=42806]: Fix the column offsets for fstrings ast nodes surrounded by parentheses and for nodes that spawn multiple lines. Patch by Pablo Galindo.

• bpo-40631 [https://bugs.python.org/issue?@action=redirect&bpo=40631]: Fix regression where a single parenthesized starred expression was a valid assignment target.

• bpo-27794 [https://bugs.python.org/issue?@action=redirect&bpo=27794]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=42745]: Make the type attribute lookup cache per-interpreter. Patch by Victor Stinner.

• bpo-42246 [https://bugs.python.org/issue?@action=redirect&bpo=42246]: Jumps to jumps are not eliminated when it would break PEP 626.

• bpo-42246 [https://bugs.python.org/issue?@action=redirect&bpo=42246]: Make sure that the f_lasti and f_lineno attributes of a frame are set correctly when an exception is raised or reraised. Required for PEP 626.

• bpo-32381 [https://bugs.python.org/issue?@action=redirect&bpo=32381]: The coding cookie (ex: # coding: latin1) is now ignored in the command passed to the -c command line option. Patch by Victor Stinner.

• bpo-30858 [https://bugs.python.org/issue?@action=redirect&bpo=30858]: Improve error location in expressions that contain assignments. Patch by Pablo Galindo and Lysandros Nikolaou.

• bpo-42615 [https://bugs.python.org/issue?@action=redirect&bpo=42615]: Remove jump commands made redundant by the deletion of unreachable bytecode blocks

• bpo-42639 [https://bugs.python.org/issue?@action=redirect&bpo=42639]: Make the atexit module state per-interpreter. It is now safe have more than one atexit module instance. Patch by Donghee Na and Victor Stinner.

• bpo-32381 [https://bugs.python.org/issue?@action=redirect&bpo=32381]: Fix encoding name when running a .pyc file on Windows: PyRun_SimpleFileExFlags() now uses the correct encoding to decode the filename.

• bpo-42195 [https://bugs.python.org/issue?@action=redirect&bpo=42195]: The __args__ of the parameterized generics for typing.Callable and collections.abc.Callable are now consistent. The __args__ for collections.abc.Callable are now flattened while typing.Callable's have not changed. To allow this change, 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 Callables no longer validate their argtypes, in Callable[[argtypes], resulttype] to prepare for PEP 612 [https://peps.python.org/pep-0612/]. Patch by Ken Jin.

• bpo-40137 [https://bugs.python.org/issue?@action=redirect&bpo=40137]: Convert functools module to use PyType_FromModuleAndSpec().

• bpo-40077 [https://bugs.python.org/issue?@action=redirect&bpo=40077]: Convert array to use heap types, and establish module state for these.

• bpo-42008 [https://bugs.python.org/issue?@action=redirect&bpo=42008]: Fix _random.Random() seeding.

• bpo-1635741 [https://bugs.python.org/issue?@action=redirect&bpo=1635741]: Port the pyexpat extension module to multiphase initialization ( PEP 489 [https://peps.python.org/pep-0489/]).

• bpo-40521 [https://bugs.python.org/issue?@action=redirect&bpo=40521]: Make the Unicode dictionary of interned strings compatible with subinterpreters. Patch by Victor Stinner.

• bpo-39465 [https://bugs.python.org/issue?@action=redirect&bpo=39465]: Make PyUnicodeFromId() function compatible with subinterpreters. Each interpreter now has an array of identifier objects (interned strings decoded from UTF-8). Patch by Victor Stinner.

库

• bpo-42257 [https://bugs.python.org/issue?@action=redirect&bpo=42257]: Handle empty string in variable executable in platform.libc_ver()

• bpo-42772 [https://bugs.python.org/issue?@action=redirect&bpo=42772]: randrange() now raises a TypeError when step is specified without a stop argument. Formerly, it silently ignored the step argument.

• bpo-42759 [https://bugs.python.org/issue?@action=redirect&bpo=42759]: Fixed equality comparison of tkinter.Variable and tkinter.font.Font. Objects which belong to different Tcl interpreters are now always different, even if they have the same name.

• bpo-42756 [https://bugs.python.org/issue?@action=redirect&bpo=42756]: Configure LMTP Unix-domain socket to use socket global default timeout when a timeout is not explicitly provided.

• bpo-23328 [https://bugs.python.org/issue?@action=redirect&bpo=23328]: Allow / character in username, password fields on _PROXY envars.

• bpo-42740 [https://bugs.python.org/issue?@action=redirect&bpo=42740]: typing.get_args() and typing.get_origin() now support PEP 604 [https://peps.python.org/pep-0604/] union types and PEP 612 [https://peps.python.org/pep-0612/] additions to Callable.

• bpo-42655 [https://bugs.python.org/issue?@action=redirect&bpo=42655]: subprocess extra_groups is now correctly passed into setgroups() system call.

• bpo-42727 [https://bugs.python.org/issue?@action=redirect&bpo=42727]: EnumMeta.__prepare__ now accepts **kwds to properly support __init_subclass__

• bpo-38308 [https://bugs.python.org/issue?@action=redirect&bpo=38308]: Add optional weights to statistics.harmonic_mean().

• bpo-42721 [https://bugs.python.org/issue?@action=redirect&bpo=42721]: When simple query dialogs (tkinter.simpledialog), message boxes (tkinter.messagebox) or color choose dialog (tkinter.colorchooser) are created without arguments master and parent, and the default root window is not yet created, and 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 [https://bugs.python.org/issue?@action=redirect&bpo=25246]: Optimized collections.deque.remove().

• bpo-35728 [https://bugs.python.org/issue?@action=redirect&bpo=35728]: Added a root parameter to tkinter.font.nametofont().

• bpo-15303 [https://bugs.python.org/issue?@action=redirect&bpo=15303]: tkinter supports now widgets with boolean value False.

• bpo-42681 [https://bugs.python.org/issue?@action=redirect&bpo=42681]: Fixed range checks for color and pair numbers in curses.

• bpo-42685 [https://bugs.python.org/issue?@action=redirect&bpo=42685]: Improved placing of simple query windows in Tkinter (such as 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 [https://bugs.python.org/issue?@action=redirect&bpo=9694]: Argparse help no longer uses the confusing phrase, "optional arguments". It uses "options" instead.

• bpo-1635741 [https://bugs.python.org/issue?@action=redirect&bpo=1635741]: Port the _thread extension module to the multiphase initialization API ( PEP 489 [https://peps.python.org/pep-0489/]) and convert its static types to heap types.

• bpo-37961 [https://bugs.python.org/issue?@action=redirect&bpo=37961]: Fix crash in tracemalloc.Traceback._repr_() (regressed in Python 3.9).

• bpo-42630 [https://bugs.python.org/issue?@action=redirect&bpo=42630]: tkinter functions and constructors which need a default root window raise now RuntimeError with descriptive message instead of obscure AttributeError or NameError if it is not created yet or cannot be created automatically.

• bpo-42639 [https://bugs.python.org/issue?@action=redirect&bpo=42639]: atexit.runexitfuncs() now logs callback exceptions using sys.unraisablehook, rather than logging them directly into sys.stderr and raise the last exception.

• bpo-42644 [https://bugs.python.org/issue?@action=redirect&bpo=42644]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=42639]: At Python exit, if a callback registered with atexit.register() fails, its exception is now logged. Previously, only some exceptions were logged, and the last exception was always silently ignored.

• bpo-36541 [https://bugs.python.org/issue?@action=redirect&bpo=36541]: Fixed lib2to3.pgen2 to be able to parse PEP-570 positional only argument syntax.

• bpo-42382 [https://bugs.python.org/issue?@action=redirect&bpo=42382]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=41877]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=39717]: [tarfile] update nested exception raising to use from None or from e

• bpo-41877 [https://bugs.python.org/issue?@action=redirect&bpo=41877]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=41559]: Implemented PEP 612 [https://peps.python.org/pep-0612/]: added ParamSpec and Concatenate to typing. Patch by Ken Jin.

• bpo-42385 [https://bugs.python.org/issue?@action=redirect&bpo=42385]: StrEnum: fix generatenextvalue to return a str

• bpo-31904 [https://bugs.python.org/issue?@action=redirect&bpo=31904]: Define THREAD_STACK_SIZE for VxWorks.

• bpo-34750 [https://bugs.python.org/issue?@action=redirect&bpo=34750]: [Enum] _EnumDict.update() is now supported.

• bpo-42517 [https://bugs.python.org/issue?@action=redirect&bpo=42517]: Enum: private names do not become members / do not generate errors — they remain normal attributes

• bpo-42678 [https://bugs.python.org/issue?@action=redirect&bpo=42678]: Enum: call __init_subclass__ after members have been added

• bpo-28964 [https://bugs.python.org/issue?@action=redirect&bpo=28964]: ast.literal_eval() adds line number information (if available) in error message for malformed nodes.

• bpo-42470 [https://bugs.python.org/issue?@action=redirect&bpo=42470]: random.sample() no longer warns on a sequence which is also a set.

• bpo-31904 [https://bugs.python.org/issue?@action=redirect&bpo=31904]: posixpath.expanduser() returns the input path unchanged if user home directory is None on VxWorks.

• bpo-42388 [https://bugs.python.org/issue?@action=redirect&bpo=42388]: Fix subprocess.check_output(…, input=None) behavior when text=True to be consistent with that of the documentation and universal_newlines=True.

• bpo-34463 [https://bugs.python.org/issue?@action=redirect&bpo=34463]: Fixed discrepancy between traceback and the interpreter in formatting of SyntaxError with lineno not set (traceback was changed to match interpreter).

• bpo-42393 [https://bugs.python.org/issue?@action=redirect&bpo=42393]: Raise OverflowError instead of silent truncation in socket.ntohs() and socket.htons(). Silent truncation was deprecated in Python 3.7. Patch by Erlend E. Aasland

• bpo-42222 [https://bugs.python.org/issue?@action=redirect&bpo=42222]: Harmonized random.randrange() argument handling to match range().

  • The integer test and conversion in randrange() now uses 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 [https://bugs.python.org/issue?@action=redirect&bpo=42163]: Restore compatibility for uname_result around deepcopy and _replace.

• bpo-42090 [https://bugs.python.org/issue?@action=redirect&bpo=42090]: zipfile.Path.joinpath now accepts arbitrary arguments, same as pathlib.Path.joinpath.

• bpo-1635741 [https://bugs.python.org/issue?@action=redirect&bpo=1635741]: Port the _csv module to the multiphase initialization API ( PEP 489 [https://peps.python.org/pep-0489/]).

• bpo-42059 [https://bugs.python.org/issue?@action=redirect&bpo=42059]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=41960]: Add globalns and localns parameters to the inspect.signature() and inspect.Signature.from_callable().

• bpo-41907 [https://bugs.python.org/issue?@action=redirect&bpo=41907]: fix format() behavior for IntFlag

• bpo-41891 [https://bugs.python.org/issue?@action=redirect&bpo=41891]: Ensure asyncio.wait_for waits for task completion

• bpo-24792 [https://bugs.python.org/issue?@action=redirect&bpo=24792]: Fixed bug where zipimporter sometimes reports an incorrect cause of import errors.

• bpo-31904 [https://bugs.python.org/issue?@action=redirect&bpo=31904]: Fix site and sysconfig modules for VxWorks RTOS which has no home directories.

• bpo-41462 [https://bugs.python.org/issue?@action=redirect&bpo=41462]: Add os.set_blocking() support for VxWorks RTOS.

• bpo-40219 [https://bugs.python.org/issue?@action=redirect&bpo=40219]: Lowered tkinter.ttk.LabeledScale dummy widget to prevent hiding part of the content label.

• bpo-37193 [https://bugs.python.org/issue?@action=redirect&bpo=37193]: Fixed memory leak in socketserver.ThreadingMixIn introduced in Python 3.7.

• bpo-39068 [https://bugs.python.org/issue?@action=redirect&bpo=39068]: Fix initialization race condition in a85encode() and b85encode() in base64. Patch by Brandon Stansbury.

文档

• bpo-17140 [https://bugs.python.org/issue?@action=redirect&bpo=17140]: Add documentation for the multiprocessing.pool.ThreadPool class.

• bpo-34398 [https://bugs.python.org/issue?@action=redirect&bpo=34398]: Prominently feature listings from the glossary in documentation search results. Patch by Ammar Askar.

测试

• bpo-42794 [https://bugs.python.org/issue?@action=redirect&bpo=42794]: Update test_nntplib to use official group name of news.aioe.org for testing. Patch by Donghee Na.

• bpo-31904 [https://bugs.python.org/issue?@action=redirect&bpo=31904]: Skip some asyncio tests on VxWorks.

• bpo-42641 [https://bugs.python.org/issue?@action=redirect&bpo=42641]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=31904]: Skip some tests in testall_chown_common() on VxWorks.

• bpo-42199 [https://bugs.python.org/issue?@action=redirect&bpo=42199]: Fix bytecode helper assertNotInBytecode.

• bpo-41443 [https://bugs.python.org/issue?@action=redirect&bpo=41443]: Add more attribute checking in test_posix.py

• bpo-31904 [https://bugs.python.org/issue?@action=redirect&bpo=31904]: Disable os.popen and impacted tests on VxWorks

• bpo-41439 [https://bugs.python.org/issue?@action=redirect&bpo=41439]: Port test_ssl and test_uuid to VxWorks RTOS.

构建

• bpo-42692 [https://bugs.python.org/issue?@action=redirect&bpo=42692]: Fix __builtin_available check on older compilers. Patch by Joshua Root.

• bpo-27640 [https://bugs.python.org/issue?@action=redirect&bpo=27640]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=42604]: 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 [https://bugs.python.org/issue?@action=redirect&bpo=42598]: Fix implicit function declarations in configure which could have resulted in incorrect configuration checks. Patch contributed by Joshua Root.

• bpo-31904 [https://bugs.python.org/issue?@action=redirect&bpo=31904]: Enable libpython3.so for VxWorks.

• bpo-29076 [https://bugs.python.org/issue?@action=redirect&bpo=29076]: Add fish shell support to macOS installer.

macOS

• bpo-42361 [https://bugs.python.org/issue?@action=redirect&bpo=42361]: Update macOS installer build to use Tcl/Tk 8.6.11 (rc2, expected to be final release).

• bpo-41837 [https://bugs.python.org/issue?@action=redirect&bpo=41837]: Update macOS installer build to use OpenSSL 1.1.1i.

• bpo-42584 [https://bugs.python.org/issue?@action=redirect&bpo=42584]: Update macOS installer to use SQLite 3.34.0.

工具/示例

• bpo-42726 [https://bugs.python.org/issue?@action=redirect&bpo=42726]: Fixed Python 3 compatibility issue with gdb/libpython.py handling of attribute dictionaries.

• bpo-42613 [https://bugs.python.org/issue?@action=redirect&bpo=42613]: Fix freeze.py tool to use the prope config and library directories. Patch by Victor Stinner.