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+++++++++++ Python News +++++++++++ What's New in Python 3.8.7 final? ================================= *Release date: 2020-12-21* Core and Builtins ----------------- - bpo-32381: Fix encoding name when running a ``.pyc`` file on Windows: :c:func:`PyRun_SimpleFileExFlags()` now uses the correct encoding to decode the filename. - bpo-42536: Several built-in and standard library types now ensure that their internal result tuples are always tracked by the :term:`garbage collector <garbage collection>`: - :meth:`collections.OrderedDict.items() <collections.OrderedDict>` - :meth:`dict.items` - :func:`enumerate` - :func:`functools.reduce` - :func:`itertools.combinations` - :func:`itertools.combinations_with_replacement` - :func:`itertools.permutations` - :func:`itertools.product` - :func:`itertools.zip_longest` - :func:`zip` Previously, they could have become untracked by a prior garbage collection. Patch by Brandt Bucher. Library ------- - bpo-42630: :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-42644: `logging.disable` will now validate the types and value of its parameter. It also now accepts strings representing the levels (as does `loging.setLevel`) instead of only the numerical values. - bpo-36541: Fixed lib2to3.pgen2 to be able to parse PEP-570 positional only argument syntax. - bpo-42375: subprocess module update for DragonFlyBSD support. - bpo-39825: Windows: Change ``sysconfig.get_config_var('EXT_SUFFIX')`` to the expected full ``platform_tag.extension`` format. Previously it was hard-coded to ``.pyd``, now it is compatible with ``distutils.sysconfig`` and will result in something like ``.cp38-win_amd64.pyd``. This brings windows into conformance with the other platforms. - bpo-39101: Fixed tests using IsolatedAsyncioTestCase from hanging on BaseExceptions. - bpo-41907: fix `format()` behavior for `IntFlag` - bpo-41889: Enum: fix regression involving inheriting a multiply-inherited enum - bpo-41891: Ensure asyncio.wait_for waits for task completion - bpo-40219: Lowered :class:`tkinter.ttk.LabeledScale` dummy widget to prevent hiding part of the content label. - bpo-40084: Fix ``Enum.__dir__``: dir(Enum.member) now includes attributes as well as methods. Documentation ------------- - bpo-17140: Add documentation for the :class:`multiprocessing.pool.ThreadPool` class. Build ----- - 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"). Previosuly only Linux, Mac and VxWorks were using a value for "EXT_SUFFIX" that included "SOABI". - bpo-42598: Fix implicit function declarations in configure which could have resulted in incorrect configuration checks. Patch contributed by Joshua Root. Tools/Demos ----------- - bpo-42613: Fix ``freeze.py`` tool to use the prope config and library directories. Patch by Victor Stinner. What's New in Python 3.8.7 release candidate 1? =============================================== *Release date: 2020-12-07* Security -------- - bpo-42103: Prevented potential DoS attack via CPU and RAM exhaustion when processing malformed Apple Property List files in binary format. - bpo-42051: 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-40791: Add ``volatile`` to the accumulator variable in ``hmac.compare_digest``, making constant-time-defeating optimizations less likely. Core and Builtins ----------------- - bpo-41686: On Windows, the ``SIGINT`` event, ``_PyOS_SigintEvent()``, is now created even if Python is configured to not install signal handlers (if :c:member:`PyConfig.install_signal_handlers` equals to 0, or ``Py_InitializeEx(0)``). - bpo-42143: Fix handling of errors during creation of ``PyFunctionObject``, which resulted in operations on uninitialized memory. Patch by Yonatan Goldschmidt. - bpo-41984: The garbage collector now tracks all user-defined classes. Patch by Brandt Bucher. - bpo-41909: Fixed stack overflow in :func:`issubclass` and :func:`isinstance` when getting the ``__bases__`` attribute leads to infinite recursion. - bpo-41894: 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. Library ------- - bpo-17735: :func:`inspect.findsource` now raises :exc:`OSError` instead of :exc:`IndexError` when :attr:`co_lineno` of a code object is greater than the file length. This can happen, for example, when a file is edited after it was imported. PR by Irit Katriel. - bpo-42116: Fix handling of trailing comments by :func:`inspect.getsource`. - bpo-42482: :class:`~traceback.TracebackException` no longer holds a reference to the exception's traceback object. Consequently, instances of TracebackException for equivalent but non-equal exceptions now compare as equal. - bpo-42406: We fixed an issue in `pickle.whichmodule` in which importing `multiprocessing` could change the how pickle identifies which module an object belongs to, potentially breaking the unpickling of those objects. - bpo-42328: Fixed :meth:`tkinter.ttk.Style.map`. The function accepts now the representation of the default state as empty sequence (as returned by ``Style.map()``). The structure of the result is now the same on all platform and does not depend on the value of ``wantobjects``. - bpo-42014: The ``onerror`` callback from ``shutil.rmtree`` now receives correct function when ``os.open`` fails. - bpo-42237: Fix `os.sendfile()` on illumos. - bpo-42249: Fixed writing binary Plist files larger than 4 GiB. - bpo-35455: 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-41754: webbrowser: Ignore *NotADirectoryError* when calling ``xdg-settings``. - bpo-29566: ``binhex.binhex()`` consisently writes macOS 9 line endings. - bpo-42183: Fix a stack overflow error for asyncio Task or Future repr(). The overflow occurs under some circumstances when a Task or Future recursively returns itself. - bpo-42103: :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-41491: plistlib: fix parsing XML plists with hexadecimal integer values - bpo-32498: Clearer exception message when passing an argument of type bytes to :func:`urllib.parse.unquote`. This is only for 3.8; in 3.9 and later this function accepts bytes inputs as well. PR by Irit Katriel. - bpo-42065: 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: Fix pickling pure Python :class:`datetime.time` subclasses. Patch by Dean Inwood. - bpo-41976: 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-41900: C14N 2.0 serialisation in xml.etree.ElementTree failed f