#4767: python3-3.9.1
--------------------+-----------------------
Reporter: bdubbs | Owner: lfs-book
Type: task | Status: new
Priority: normal | Milestone: 10.1
Component: Book | Version: SVN
Severity: normal | Resolution:
Keywords: |
--------------------+-----------------------
Comment (by bdubbs):
What's New in Python 3.9.1 final?
*Release date: 2020-12-07*
Core and Builtins
- bpo-42576: ``types.GenericAlias`` will now raise a ``TypeError`` when
attempting to initialize with a keyword argument. Previously, this
would
cause the interpreter to crash if the interpreter was compiled with
debug
symbols. This does not affect interpreters compiled for release. Patch
by
Ken Jin.
Library
- bpo-5054: CGIHTTPRequestHandler.run_cgi() HTTP_ACCEPT improperly parsed.
Replace the special purpose getallmatchingheaders with generic get_all
method and add relevant tests.
- 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.
- bpo-42116: Fix handling of trailing comments by
:func:`inspect.getsource`.
- bpo-42487: ChainMap.__iter__ no longer calls __getitem__ on underlying
maps
- 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-34215: Clarify the error message for
:exc:`asyncio.IncompleteReadError` when ``expected`` is ``None``.
- bpo-12800: Extracting a symlink from a tarball should succeed and
overwrite the symlink if it already exists. The fix is to remove the
existing file or symlink before extraction.
Tests
- bpo-41473: Reenable test_gdb on gdb 9.2 and newer:
https://bugzilla.redhat.com/show_bug.cgi?id=1866884 bug is fixed in gdb
10.1.
- bpo-42553: Fix ``test_asyncio.test_call_later()`` race condition: don't
measure asyncio performance in the ``call_later()`` unit test. The test
failed randomly on the CI.
macOS
- bpo-41116: If no explicit macOS SDK was specified, setup.py should check
for Tcl and TK frameworks in /Library/Frameworks; the previous commit
inadvertently broke that test.
- bpo-42504: Fix build on macOS Big Sur when MACOSX_DEPLOYMENT_TARGET=11
IDLE
- bpo-42508: Keep IDLE running on macOS. Remove obsolete workaround that
prevented running files with shortcuts when using new universal2
installers built on macOS 11.
What's New in Python 3.9.1 release candidate 1?
*Release date: 2020-11-24*
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-42381: Allow assignment expressions in set literals and set
comprehensions as per PEP 572.
- bpo-42374: Fix a regression introduced by the new parser, where an
unparenthesized walrus operator was not allowed within generator
expressions.
- bpo-42296: On Windows, fix a regression in signal handling which
prevented
to interrupt a program using CTRL+C. The signal handler can be run in a
thread different than the Python thread, in which case the test deciding
if the thread can handle signals is wrong.
- bpo-42332: :class:`types.GenericAlias` objects can now be the targets of
weakrefs.
- bpo-42218: 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: Fixed a possible crash in the PEG parser when checking for
the
'!=' token in the ``barry_as_flufl`` rule. Patch by Pablo Galindo.
- bpo-42143: Fix handling of errors during creation of
``PyFunctionObject``,
which resulted in operations on uninitialized memory. Patch by Yonatan
Goldschmidt.
- bpo-41659: 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: Fix possible buffer overflow in the new parser when checking
for continuation lines.
- bpo-42123: 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-41910: Document the default implementation of `object.__eq__`.
- bpo-42057: Fix peephole optimizer misoptimize conditional jump +
JUMP_IF_NOT_EXC_MATCH pair.
- bpo-41984: The garbage collector now tracks all user-defined classes.
- bpo-41993: Fixed potential issues with removing not completely
initialized
module from ``sys.modules`` when import fails.
- bpo-41979: Star-unpacking is now allowed for with item's targets in the
PEG parser.
- 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.
- bpo-39934: Correctly count control blocks in 'except' in compiler.
Ensures
that a syntax error, rather a fatal error, occurs for deeply nested,
named
exception handlers.
Library
- 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-42345: Fix various issues with ``typing.Literal`` parameter handling
(flatten, deduplicate, use type to cache key).
- bpo-42350: Fix the :class:`threading.Thread` class at fork: do nothing
if
the thread is already stopped (ex: fork called at Python exit).
Previously, an error was logged in the child process.
- 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-42233: 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-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-42146: Fix memory leak in :func:`subprocess.Popen` in case an uid
(gid) specified in `user` (`group`, `extra_groups`) overflows `uid_t`
(`gid_t`).
- bpo-42140: Improve asyncio.wait function to create the futures set just
one time.
- 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-41052: Pickling heap types implemented in C with protocols 0 and 1
raises now an error instead of producing incorrect data.
- bpo-41491: plistlib: fix parsing XML plists with hexadecimal integer
values
- 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.
- bpo-41966: Fix pickling pure Python :class:`datetime.time` subclasses.
- 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.
- bpo-41900: C14N 2.0 serialisation in xml.etree.ElementTree failed for
unprefixed attributes when a default namespace was defined.
- bpo-41840: Fix a bug in the :mod:`symtable` module that was causing
module-scope global variables to not be reported as both local and
global.
- bpo-41831: ``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-41817: fix `tkinter.EventType` Enum so all members are strings, and
none are tuples
- bpo-41815: Fix SQLite3 segfault when backing up closed database. Patch
contributed by Peter David McCormick.
- bpo-41316: Fix the :mod:`tarfile` module to write only basename of TAR
file to GZIP compression header.
- bpo-16936: Allow ``ctypes.wintypes`` to be imported on non-Windows
systems.
- bpo-40592: :func:`shutil.which` now ignores empty entries in
:envvar:`PATHEXT` instead of treating them as a match.
- bpo-40550: Fix time-of-check/time-of-action issue in
subprocess.Popen.send_signal.
- bpo-40492: 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.
- bpo-40105: ZipFile truncates files to avoid corruption when a shorter
comment is provided in append ("a") mode.
- bpo-27321: Fixed KeyError exception when flattening an email to a string
attempts to replace a non-existent Content-Transfer-Encoding header.
Documentation
- bpo-42153: Fix the URL for the IMAP protocol documents.
- bpo-42061: Document __format__ functionality for IP addresses.
- bpo-42010: 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: Documented :ref:`generic alias type <types-genericalias>` and
:data:`types.GenericAlias`. Also added an entry in glossary for
:term:`generic types <generic type>`.
- bpo-41774: In Programming FAQ "Sequences (Tuples/Lists)" section, add
"How
do you remove multiple items from a list".
- bpo-35293: Fix RemovedInSphinx40Warning when building the documentation.
- bpo-41726: Update the refcounts info of ``PyType_FromModuleAndSpec``.
- bpo-39693: Fix tarfile's extractfile documentation
- bpo-39416: Document some restrictions on the default string
representations of numeric classes.
Tests
- bpo-40754: Include ``_testinternalcapi`` module in Windows installer for
test suite
- bpo-41739: 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: 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: Tests for CJK codecs no longer call ``eval()`` on content
received via HTTP.
- bpo-41939: Fix test_site.test_license_exists_at_url(): call
``urllib.request.urlcleanup()`` to reset the global
``urllib.request._opener``. Patch by Victor Stinner.
- bpo-41561: test_ssl: skip test_min_max_version_mismatch when TLS 1.0 is
not available
- bpo-41602: Add tests for SIGINT handling in the runpy module.
- bpo-41306: Fixed a failure in ``test_tk.test_widgets.ScaleTest``
happening
when executing the test with Tk 8.6.10.
Build
- bpo-42398: Fix a race condition in "make regen-all" when make -jN option
is used to run jobs in parallel. The clinic.py script now only use
atomic
write to write files. Moveover, generated files are now left unchanged
if
the content does not change, to not change the file modification time.
- bpo-41617: Fix building ``pycore_bitutils.h`` internal header on old
clang
version without ``__builtin_bswap16()`` (ex: Xcode 4.6.3 on Mac OS X
10.7). Patch by Joshua Root and Victor Stinner.
- bpo-38249: Update :c:macro:`Py_UNREACHABLE` to use
__builtin_unreachable()
if only the compiler is able to use it. Patch by Dong-hee Na.
- bpo-40998: Addressed three compiler warnings found by undefined behavior
sanitizer (ubsan).
Windows
- bpo-42120: Remove macro definition of ``copysign`` (to ``_copysign``) in
headers.
- bpo-38439: Updates the icons for IDLE in the Windows Store package.
- bpo-41744: Fixes automatic import of props file when using the Nuget
package.
- bpo-41557: Update Windows installer to use SQLite 3.33.0.
- bpo-38324: Avoid Unicode errors when accessing certain locale data on
Windows.
macOS
- bpo-41116: Ensure distutils.unixxcompiler.find_library_file can find
system provided libraries on macOS 11.
- bpo-41100: Add support for macOS 11 and Apple Silicon systems.
It is now possible to build "Universal 2" binaries using
"--enable-universalsdk --with-universal-archs=universal2".
Binaries build on later macOS versions can be deployed back to older
versions (tested up to macOS 10.9), when using the correct deployment
target. This is tested using Xcode 11 and later.
- bpo-38443: The ``--enable-universalsdk`` and ``--with-universal-archs``
options for the configure script now check that the specified
architectures can be used.
- bpo-41471: Ignore invalid prefix lengths in system proxy excludes.
- bpo-41557: Update macOS installer to use SQLite 3.33.0.
IDLE
- bpo-42426: Fix reporting offset of the RE error in searchengine.
- bpo-42415: Get docstrings for IDLE calltips more often by using
inspect.getdoc.
- bpo-33987: Mostly finish using ttk widgets, mainly for editor, settings,
and searches.
- bpo-41775: Use 'IDLE Shell' as shell title
- bpo-35764: Rewrite the Calltips doc section.
- bpo-40181: In calltips, stop reminding that '/' marks the end of
positional-only arguments.
- bpo-40511: 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: 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.
C API
- bpo-42015: Fix potential crash in deallocating method objects when
dynamically allocated `PyMethodDef`'s lifetime is managed through the
``self`` argument of a `PyCFunction`.
- bpo-41986: :c:data:`Py_FileSystemDefaultEncodeErrors` and
:c:data:`Py_UTF8Mode` are available again in limited API.
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