Python 3.8.7rc1

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Łukasz Langa 2020-12-07 15:13:36 +01:00
parent a4e7d5f750
commit e3201094af
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73 changed files with 1418 additions and 683 deletions

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/*--start constants--*/
#define PY_MAJOR_VERSION 3
#define PY_MINOR_VERSION 8
#define PY_MICRO_VERSION 6
#define PY_RELEASE_LEVEL PY_RELEASE_LEVEL_FINAL
#define PY_RELEASE_SERIAL 0
#define PY_MICRO_VERSION 7
#define PY_RELEASE_LEVEL PY_RELEASE_LEVEL_GAMMA
#define PY_RELEASE_SERIAL 1
/* Version as a string */
#define PY_VERSION "3.8.6+"
#define PY_VERSION "3.8.7rc1"
/*--end constants--*/
/* Version as a single 4-byte hex number, e.g. 0x010502B2 == 1.5.2b2.

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696
Misc/NEWS.d/3.8.7rc1.rst Normal file
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@ -0,0 +1,696 @@
.. bpo: 42103
.. date: 2020-10-23-19-19-30
.. nonce: cILT66
.. release date: 2020-12-07
.. 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: 40791
.. date: 2020-05-28-06-06-47
.. nonce: QGZClX
.. section: Security
Add ``volatile`` to the accumulator variable in ``hmac.compare_digest``,
making constant-time-defeating optimizations less likely.
..
.. bpo: 41686
.. date: 2020-11-17-16-25-50
.. nonce: hX77kL
.. section: Core and Builtins
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
.. 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: 41910
.. date: 2020-10-21-14-40-54
.. nonce: CzBMit
.. section: Core and Builtins
Document the default implementation of `object.__eq__`.
..
.. 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: 41909
.. date: 2020-10-04-10-55-12
.. nonce: BqHPcm
.. section: Core and Builtins
Fixed stack overflow in :func:`issubclass` and :func:`isinstance` when
getting the ``__bases__`` attribute leads to infinite recursion.
..
.. 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: 17735
.. date: 2020-12-03-22-22-24
.. nonce: Qsaaue
.. section: Library
: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
.. date: 2020-12-03-15-42-32
.. nonce: yIwroP
.. section: Library
Fix handling of trailing comments by :func:`inspect.getsource`.
..
.. bpo: 42482
.. date: 2020-11-27-16-46-58
.. nonce: EJC3sd
.. section: Library
: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
.. date: 2020-11-19-10-44-41
.. nonce: r9rNCj
.. section: Library
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
.. date: 2020-11-15-17-02-00
.. nonce: bqpPlR
.. section: Library
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
.. date: 2020-11-10-15-40-56
.. nonce: ShM37l
.. section: Library
The ``onerror`` callback from ``shutil.rmtree`` now receives correct
function when ``os.open`` fails.
..
.. bpo: 42237
.. date: 2020-11-10-14-27-49
.. nonce: F363jO
.. section: Library
Fix `os.sendfile()` on illumos.
..
.. bpo: 42249
.. date: 2020-11-03-09-22-56
.. nonce: vfNO2u
.. section: Library
Fixed writing binary Plist files larger than 4 GiB.
..
.. 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: 41754
.. date: 2020-11-01-15-07-20
.. nonce: DraSZh
.. section: Library
webbrowser: Ignore *NotADirectoryError* when calling ``xdg-settings``.
..
.. bpo: 29566
.. date: 2020-10-31-13-28-36
.. nonce: 6aDbty
.. section: Library
``binhex.binhex()`` consisently writes macOS 9 line endings.
..
.. bpo: 42183
.. date: 2020-10-29-11-17-35
.. nonce: 50ZcIi
.. section: Library
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
.. 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: 41491
.. date: 2020-10-19-14-02-09
.. nonce: d1BUWH
.. section: Library
plistlib: fix parsing XML plists with hexadecimal integer values
..
.. bpo: 32498
.. date: 2020-10-18-19-22-39
.. nonce: MoqSgo
.. section: Library
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
.. 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: 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: 41900
.. date: 2020-10-01-10-50-12
.. nonce: Cho7oh
.. section: Library
C14N 2.0 serialisation in xml.etree.ElementTree failed for unprefixed
attributes when a default namespace was defined.
..
.. bpo: 41855
.. date: 2020-09-24-16-45-59
.. nonce: q6Y1nm
.. section: Library
In ``importlib.metadata``, fix issue where multiple children can be returned
from ``FastPath.zip_children()``. Backport of
`python-devs/importlib_metadata#117
<https://gitlab.com/python-devs/importlib_metadata/-/issues/117>`_.
..
.. bpo: 41840
.. date: 2020-09-23-23-17-59
.. nonce: QRFr4L
.. section: Library
Fix a bug in the :mod:`symtable` module that was causing module-scope global
variables to not be reported as both local and global. Patch by Pablo
Galindo.
..
.. 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: 41662
.. date: 2020-08-30-21-38-57
.. nonce: 6e9iZn
.. section: Library
No longer override exceptions raised in ``__len__()`` of a sequence of
parameters in :mod:`sqlite3` with :exc:`~sqlite3.ProgrammingError`.
..
.. bpo: 41662
.. date: 2020-08-29-16-07-36
.. nonce: Mn79zh
.. section: Library
Fixed crash when mutate list of parameters during iteration in
:mod:`sqlite3`.
..
.. bpo: 34215
.. date: 2020-08-19-20-17-51
.. nonce: _Cv8c-
.. section: Library
Clarify the error message for :exc:`asyncio.IncompleteReadError` when
``expected`` is ``None``.
..
.. bpo: 41316
.. date: 2020-07-28-12-08-58
.. nonce: bSCbK4
.. section: Library
Fix the :mod:`tarfile` module to write only basename of TAR file to GZIP
compression header.
..
.. bpo: 12800
.. date: 2020-07-09-11-32-28
.. nonce: fNgWwx
.. section: Library
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. Based on patch by Chris AtLee, Jeffrey Kintscher, and
Senthil Kumaran.
..
.. bpo: 16936
.. date: 2020-07-08-09-45-00
.. nonce: z8o8Pn
.. section: Library
Allow ``ctypes.wintypes`` to be imported on non-Windows systems.
..
.. 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: 40105
.. date: 2020-04-03-16-13-59
.. nonce: hfM2c0
.. section: Library
ZipFile truncates files to avoid corruption when a shorter comment is
provided in append ("a") mode. Patch by Jan Mazur.
..
.. 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: 32793
.. date: 2019-08-20-05-17-32
.. nonce: cgpXl6
.. section: Library
Fix a duplicated debug message when :meth:`smtplib.SMTP.connect` is called.
..
.. bpo: 42153
.. date: 2020-11-15-13-46-31
.. nonce: KjBhx3
.. section: Documentation
Fix the URL for the IMAP protocol documents.
..
.. bpo: 41774
.. date: 2020-09-24-15-35-13
.. nonce: 5IqdGP
.. section: Documentation
In Programming FAQ "Sequences (Tuples/Lists)" section, add "How do you
remove multiple items from a list".
..
.. 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: 41473
.. date: 2020-12-04-11-47-09
.. nonce: W_updK
.. section: Tests
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
.. date: 2020-12-03-13-32-44
.. nonce: 2TRE2N
.. section: Tests
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.
..
.. bpo: 40754
.. date: 2020-11-13-21-51-34
.. nonce: Ekoxkg
.. section: Tests
Include ``_testinternalcapi`` module in Windows installer for test suite
..
.. 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: 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: 41939
.. date: 2020-10-05-09-37-43
.. nonce: P4OlbA
.. section: Tests
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
.. date: 2020-09-18-16-14-03
.. nonce: uPnwrW
.. section: Tests
test_ssl: skip test_min_max_version_mismatch when TLS 1.0 is not available
..
.. bpo: 41602
.. date: 2020-08-25-19-25-36
.. nonce: Z64s0I
.. section: Tests
Add tests for SIGINT handling in the runpy module.
..
.. 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: 42398
.. date: 2020-11-18-11-58-44
.. nonce: Yt5wO8
.. section: Build
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: 42120
.. date: 2020-11-16-22-41-02
.. nonce: 9scgko
.. section: Windows
Remove macro definition of ``copysign`` (to ``_copysign``) in headers.
..
.. 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: 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: 38443
.. date: 2020-10-23-10-26-53
.. nonce: vu64tl
.. section: macOS
The ``--enable-universalsdk`` and ``--with-universal-archs`` options for the
configure script now check that the specified architectures can be used.
..
.. bpo: 41471
.. date: 2020-10-19-12-25-19
.. nonce: gwA7un
.. section: macOS
Ignore invalid prefix lengths in system proxy excludes.
..
.. bpo: 41557
.. date: 2020-08-26-09-31-37
.. nonce: mcQ75z
.. section: macOS
Update macOS installer to use SQLite 3.33.0.
..
.. bpo: 42426
.. date: 2020-11-21-17-21-21
.. nonce: kNnPoC
.. section: IDLE
Fix reporting offset of the RE error in searchengine.
..
.. bpo: 42415
.. date: 2020-11-20-01-30-27
.. nonce: CyD-va
.. section: IDLE
Get docstrings for IDLE calltips more often by using inspect.getdoc.
..
.. 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: 41775
.. date: 2020-09-24-14-31-16
.. nonce: sB8Vre
.. section: IDLE
Use 'IDLE Shell' as shell title
..
.. 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: 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.

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@ -1,4 +0,0 @@
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.

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@ -1,2 +0,0 @@
:c:data:`Py_FileSystemDefaultEncodeErrors` and :c:data:`Py_UTF8Mode` are
available again in limited API.

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@ -1,3 +0,0 @@
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.

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@ -1,2 +0,0 @@
Fixed stack overflow in :func:`issubclass` and :func:`isinstance` when
getting the ``__bases__`` attribute leads to infinite recursion.

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@ -1,2 +0,0 @@
The garbage collector now tracks all user-defined classes. Patch by Brandt
Bucher.

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@ -1 +0,0 @@
Document the default implementation of `object.__eq__`.

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@ -1,2 +0,0 @@
Fix handling of errors during creation of ``PyFunctionObject``, which resulted
in operations on uninitialized memory. Patch by Yonatan Goldschmidt.

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@ -1,4 +0,0 @@
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)``).

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@ -1 +0,0 @@
Document some restrictions on the default string representations of numeric classes.

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@ -1,2 +0,0 @@
In Programming FAQ "Sequences (Tuples/Lists)" section, add "How do you
remove multiple items from a list".

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@ -1 +0,0 @@
Fix the URL for the IMAP protocol documents.

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@ -1,2 +0,0 @@
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.

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@ -1,3 +0,0 @@
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.

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@ -1 +0,0 @@
Use 'IDLE Shell' as shell title

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@ -1,3 +0,0 @@
Mostly finish using ttk widgets, mainly for editor, settings,
and searches. Some patches by Mark Roseman.

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@ -1 +0,0 @@
Get docstrings for IDLE calltips more often by using inspect.getdoc.

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@ -1 +0,0 @@
Fix reporting offset of the RE error in searchengine.

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@ -1 +0,0 @@
Fix a duplicated debug message when :meth:`smtplib.SMTP.connect` is called.

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@ -1,2 +0,0 @@
Fixed KeyError exception when flattening an email to a string attempts to
replace a non-existent Content-Transfer-Encoding header.

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@ -1,2 +0,0 @@
ZipFile truncates files to avoid corruption when a shorter comment is provided
in append ("a") mode. Patch by Jan Mazur.

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@ -1,3 +0,0 @@
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.

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@ -1 +0,0 @@
:func:`shutil.which` now ignores empty entries in :envvar:`PATHEXT` instead of treating them as a match.

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@ -1 +0,0 @@
Allow ``ctypes.wintypes`` to be imported on non-Windows systems.

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@ -1,4 +0,0 @@
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. Based on patch by Chris AtLee, Jeffrey Kintscher, and
Senthil Kumaran.

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@ -1 +0,0 @@
Fix the :mod:`tarfile` module to write only basename of TAR file to GZIP compression header.

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@ -1,2 +0,0 @@
Clarify the error message for :exc:`asyncio.IncompleteReadError` when
``expected`` is ``None``.

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@ -1 +0,0 @@
Fixed crash when mutate list of parameters during iteration in :mod:`sqlite3`.

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@ -1,2 +0,0 @@
No longer override exceptions raised in ``__len__()`` of a sequence of
parameters in :mod:`sqlite3` with :exc:`~sqlite3.ProgrammingError`.

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@ -1,3 +0,0 @@
``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.

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@ -1,3 +0,0 @@
Fix a bug in the :mod:`symtable` module that was causing module-scope global
variables to not be reported as both local and global. Patch by Pablo
Galindo.

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@ -1,4 +0,0 @@
In ``importlib.metadata``, fix issue where multiple children can be returned
from ``FastPath.zip_children()``. Backport of
`python-devs/importlib_metadata#117
<https://gitlab.com/python-devs/importlib_metadata/-/issues/117>`_.

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@ -1,2 +0,0 @@
C14N 2.0 serialisation in xml.etree.ElementTree failed for unprefixed attributes
when a default namespace was defined.

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@ -1,3 +0,0 @@
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

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@ -1,2 +0,0 @@
Fix pickling pure Python :class:`datetime.time` subclasses. Patch by Dean
Inwood.

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@ -1,3 +0,0 @@
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.

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@ -1,3 +0,0 @@
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.

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@ -1 +0,0 @@
plistlib: fix parsing XML plists with hexadecimal integer values

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@ -1,3 +0,0 @@
: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).

View File

@ -1,4 +0,0 @@
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.

View File

@ -1 +0,0 @@
``binhex.binhex()`` consisently writes macOS 9 line endings.

View File

@ -1 +0,0 @@
webbrowser: Ignore *NotADirectoryError* when calling ``xdg-settings``.

View File

@ -1,3 +0,0 @@
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.

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@ -1 +0,0 @@
Fixed writing binary Plist files larger than 4 GiB.

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@ -1 +0,0 @@
Fix `os.sendfile()` on illumos.

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@ -1 +0,0 @@
The ``onerror`` callback from ``shutil.rmtree`` now receives correct function when ``os.open`` fails.

View File

@ -1,4 +0,0 @@
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``.

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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.

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: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.

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Fix handling of trailing comments by :func:`inspect.getsource`.

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: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.

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Add ``volatile`` to the accumulator variable in ``hmac.compare_digest``, making constant-time-defeating optimizations less likely.

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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.

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

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

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Add tests for SIGINT handling in the runpy module.

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test_ssl: skip test_min_max_version_mismatch when TLS 1.0 is not available

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Fix test_site.test_license_exists_at_url(): call
``urllib.request.urlcleanup()`` to reset the global
``urllib.request._opener``. Patch by Victor Stinner.

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

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

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Include ``_testinternalcapi`` module in Windows installer for test suite

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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.

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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.

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Avoid Unicode errors when accessing certain locale data on Windows.

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Update Windows installer to use SQLite 3.33.0.

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Updates the icons for IDLE in the Windows Store package.

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Remove macro definition of ``copysign`` (to ``_copysign``) in headers.

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Update macOS installer to use SQLite 3.33.0.

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Ignore invalid prefix lengths in system proxy excludes.

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The ``--enable-universalsdk`` and ``--with-universal-archs`` options for the
configure script now check that the specified architectures can be used.

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This is Python version 3.8.6
============================
This is Python version 3.8.7rc1
===============================
.. image:: https://travis-ci.org/python/cpython.svg?branch=3.8
:alt: CPython build status on Travis CI