cpython/Misc/NEWS.d/3.8.0b4.rst

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.. bpo: 34155
.. date: 2019-05-04-13-33-37
.. nonce: MJll68
.. release date: 2019-08-29
.. section: Security
Fix parsing of invalid email addresses with more than one ``@`` (e.g.
a@b@c.com.) to not return the part before 2nd ``@`` as valid email address.
Patch by maxking & jpic.
..
.. bpo: 37947
.. date: 2019-08-26-04-09-57
.. nonce: mzAQtB
.. section: Core and Builtins
Adjust correctly the recursion level in the symtable generation for named
expressions. Patch by Pablo Galindo.
..
.. bpo: 37830
.. date: 2019-08-17-18-41-59
.. nonce: fNfMbz
.. section: Core and Builtins
Fixed compilation of :keyword:`break` and :keyword:`continue` in the
:keyword:`finally` block when the corresponding :keyword:`try` block
contains :keyword:`return` with a non-constant value.
..
.. bpo: 32912
.. date: 2019-08-06-14-03-59
.. nonce: UDwSMJ
.. section: Core and Builtins
Reverted :issue:`32912`: emitting :exc:`SyntaxWarning` instead of
:exc:`DeprecationWarning` for invalid escape sequences in string and bytes
literals.
..
.. bpo: 37757
.. date: 2019-08-05-14-22-59
.. nonce: lRv5HX
.. section: Core and Builtins
:pep:`572`: As described in the PEP, assignment expressions now raise
:exc:`SyntaxError` when their interaction with comprehension scoping results
in an ambiguous target scope.
The ``TargetScopeError`` subclass originally proposed by the PEP has been
removed in favour of just raising regular syntax errors for the disallowed
cases.
..
.. bpo: 36311
.. date: 2019-08-02-15-01-33
.. nonce: uY5vt-
.. section: Core and Builtins
Decoding bytes objects larger than 2GiB is faster and no longer fails when a
multibyte characters spans a chunk boundary.
..
.. bpo: 37433
.. date: 2019-06-27-15-01-14
.. nonce: amNGqr
.. section: Core and Builtins
Fix ``SyntaxError`` indicator printing too many spaces for multi-line
strings - by Anthony Sottile.
..
.. bpo: 20523
.. date: 2019-02-15-20-42-36
.. nonce: rRLrvr
.. section: Core and Builtins
``pdb.Pdb`` supports ~/.pdbrc in Windows 7. Patch by Tim Hopper and Dan
Lidral-Porter.
..
.. bpo: 37834
.. date: 2019-08-29-16-41-36
.. nonce: FThnsh
.. section: Library
Prevent shutil.rmtree exception when built on non-Windows system without fd
system call support, like older versions of macOS.
..
.. bpo: 37965
.. date: 2019-08-28-14-04-18
.. nonce: 7xGE-C
.. section: Library
Fix C compiler warning caused by distutils.ccompiler.CCompiler.has_function.
..
.. bpo: 37960
.. date: 2019-08-27-10-52-13
.. nonce: CTY7Lw
.. section: Library
``repr()`` of buffered and text streams now silences only expected
exceptions when get the value of "name" and "mode" attributes.
..
.. bpo: 37951
.. date: 2019-08-27-10-03-48
.. nonce: MfRQgL
.. section: Library
Most features of the subprocess module now work again in subinterpreters.
Only *preexec_fn* is restricted in subinterpreters.
..
.. bpo: 36205
.. date: 2019-08-27-03-53-26
.. nonce: AfkGRl
.. section: Library
Fix the rusage implementation of time.process_time() to correctly report the
sum of the system and user CPU time.
..
.. bpo: 37950
.. date: 2019-08-26-10-45-51
.. nonce: -K1IKT
.. section: Library
Fix :func:`ast.dump` when call with incompletely initialized node.
..
.. bpo: 34679
.. date: 2019-08-25-18-07-48
.. nonce: HECzL7
.. section: Library
Restores instantiation of Windows IOCP event loops from the non-main thread.
..
.. bpo: 36917
.. date: 2019-08-25-14-56-42
.. nonce: GBxdw2
.. section: Library
Add default implementation of the :meth:`ast.NodeVisitor.visit_Constant`
method which emits a deprecation warning and calls corresponding methody
``visit_Num()``, ``visit_Str()``, etc.
..
.. bpo: 37798
.. date: 2019-08-24-16-54-49
.. nonce: 7mRQCk
.. section: Library
Update test_statistics.py to verify that the statistics module works well
for both C and Python implementations. Patch by Dong-hee Na
..
.. bpo: 26589
.. date: 2019-08-23-00-55-19
.. nonce: M1xyxG
.. section: Library
Added a new status code to the http module: 451
UNAVAILABLE_FOR_LEGAL_REASONS
..
.. bpo: 37915
.. date: 2019-08-22-16-13-27
.. nonce: xyoZI5
.. section: Library
Fix a segmentation fault that appeared when comparing instances of
``datetime.timezone`` and ``datetime.tzinfo`` objects. Patch by Pablo
Galindo.
..
.. bpo: 37868
.. date: 2019-08-17-22-33-54
.. nonce: hp64fi
.. section: Library
Fix dataclasses.is_dataclass when given an instance that never raises
AttributeError in __getattr__. That is, an object that returns something
for __dataclass_fields__ even if it's not a dataclass.
..
.. bpo: 37811
.. date: 2019-08-14-21-41-07
.. nonce: d1xYj7
.. section: Library
Fix ``socket`` module's ``socket.connect(address)`` function being unable to
establish connection in case of interrupted system call. The problem was
observed on all OSes which ``poll(2)`` system call can take only
non-negative integers and -1 as a timeout value.
..
.. bpo: 21131
.. date: 2019-08-14-15-34-23
.. nonce: 0MMQRi
.. section: Library
Fix ``faulthandler.register(chain=True)`` stack. faulthandler now allocates
a dedicated stack of ``SIGSTKSZ*2`` bytes, instead of just ``SIGSTKSZ``
bytes. Calling the previous signal handler in faulthandler signal handler
uses more than ``SIGSTKSZ`` bytes of stack memory on some platforms.
..
.. bpo: 37798
.. date: 2019-08-14-13-51-24
.. nonce: AmXrik
.. section: Library
Add C fastpath for statistics.NormalDist.inv_cdf() Patch by Dong-hee Na
..
.. bpo: 37819
.. date: 2019-08-11-10-34-19
.. nonce: LVJls-
.. section: Library
Add Fraction.as_integer_ratio() to match the corresponding methods in bool,
int, float, and decimal.
..
.. bpo: 37810
.. date: 2019-08-10-12-33-27
.. nonce: d4zbvB
.. section: Library
Fix :mod:`difflib` ``?`` hint in diff output when dealing with tabs. Patch
by Anthony Sottile.
..
.. bpo: 37772
.. date: 2019-08-07-23-48-09
.. nonce: hLCvdn
.. section: Library
In ``zipfile.Path``, when adding implicit dirs, ensure that ancestral
directories are added and that duplicates are excluded.
..
.. bpo: 28292
.. date: 2019-08-04-11-47-58
.. nonce: vkihH5
.. section: Library
Mark calendar.py helper functions as being private. The follows PEP 8
guidance to maintain the style conventions in the module and it addresses a
known case of user confusion.
..
.. bpo: 18049
.. date: 2019-08-02-16-44-42
.. nonce: OA4qBL
.. section: Library
Add definition of THREAD_STACK_SIZE for AIX in Python/thread_pthread.h The
default thread stacksize caused crashes with the default recursion limit
Patch by M Felt
..
.. bpo: 37738
.. date: 2019-08-01-17-11-16
.. nonce: A3WWcT
.. section: Library
Fix the implementation of curses ``addch(str, color_pair)``: pass the color
pair to ``setcchar()``, instead of always passing 0 as the color pair.
..
.. bpo: 37723
.. date: 2019-07-31-16-49-01
.. nonce: zq6tw8
.. section: Library
Fix performance regression on regular expression parsing with huge character
sets. Patch by Yann Vaginay.
..
.. bpo: 32178
.. date: 2019-07-30-22-41-05
.. nonce: X-IFLe
.. section: Library
Fix IndexError in :mod:`email` package when trying to parse invalid address
fields starting with ``:``.
..
.. bpo: 37685
.. date: 2019-07-28-22-25-25
.. nonce: _3bN9f
.. section: Library
Fixed comparisons of :class:`datetime.timedelta` and
:class:`datetime.timezone`.
..
.. bpo: 37695
.. date: 2019-07-27-20-21-03
.. nonce: QANdvg
.. section: Library
Correct :func:`curses.unget_wch` error message. Patch by Anthony Sottile.
..
.. bpo: 37354
.. date: 2019-07-25-10-28-40
.. nonce: RT3_3H
.. section: Library
Make Activate.ps1 Powershell script static to allow for signing it.
..
.. bpo: 37664
.. date: 2019-07-24-18-27-44
.. nonce: o-GYZC
.. section: Library
Update wheels bundled with ensurepip (pip 19.2.3 and setuptools 41.2.0)
..
.. bpo: 37642
.. date: 2019-07-21-20-59-31
.. nonce: L61Bvy
.. section: Library
Allowed the pure Python implementation of :class:`datetime.timezone` to
represent sub-minute offsets close to minimum and maximum boundaries,
specifically in the ranges (23:59, 24:00) and (-23:59, 24:00). Patch by
Ngalim Siregar
..
.. bpo: 16970
.. date: 2019-07-19-01-46-56
.. nonce: GEASf5
.. section: Library
Adding a value error when an invalid value in passed to nargs Patch by
Robert Leenders
..
.. bpo: 37587
.. date: 2019-07-13-16-02-48
.. nonce: fd-1aF
.. section: Library
Make json.loads faster for long strings. (Patch by Marco Paolini)
..
.. bpo: 18378
.. date: 2019-07-13-13-40-12
.. nonce: NHcojp
.. section: Library
Recognize "UTF-8" as a valid value for LC_CTYPE in locale._parse_localename.
..
.. bpo: 37531
.. date: 2019-07-09-19-38-26
.. nonce: GX7s8S
.. section: Library
"python3 -m test -jN --timeout=TIMEOUT" now kills a worker process if it
runs longer than *TIMEOUT* seconds.
..
.. bpo: 37482
.. date: 2019-07-09-11-20-21
.. nonce: auzvev
.. section: Library
Fix serialization of display name in originator or destination address
fields with both encoded words and special chars.
..
.. bpo: 37372
.. date: 2019-06-22-12-30-00
.. nonce: kIKqZ6
.. section: Library
Fix error unpickling datetime.time objects from Python 2 with seconds>=24.
Patch by Justin Blanchard.
..
.. bpo: 37085
.. date: 2019-06-18-16-29-31
.. nonce: GeYaD6
.. section: Library
Add the optional Linux SocketCAN Broadcast Manager constants, used as flags
to configure the BCM behaviour, in the socket module. Patch by Karl Ding.
..
.. bpo: 36871
.. date: 2019-05-12-12-58-37
.. nonce: 6xiEHZ
.. section: Library
Ensure method signature is used instead of constructor signature of a class
while asserting mock object against method calls. Patch by Karthikeyan
Singaravelan.
..
.. bpo: 36582
.. date: 2019-05-07-17-42-36
.. nonce: L_dxR6
.. section: Library
Fix ``UserString.encode()`` to correctly return ``bytes`` rather than a
``UserString`` instance.
..
.. bpo: 34775
.. date: 2018-09-23-03-18-52
.. nonce: vHeuHk
.. section: Library
Division handling of PurePath now returns NotImplemented instead of raising
a TypeError when passed something other than an instance of str or PurePath.
Patch by Roger Aiudi.
..
.. bpo: 37979
.. date: 2019-08-29-10-40-05
.. nonce: TAUx_E
.. section: Documentation
Added a link to dateutil.parser.isoparse in the datetime.fromisoformat
documentation. Patch by Paul Ganssle
..
.. bpo: 37759
.. date: 2019-08-04-19-20-58
.. nonce: EHRF4i
.. section: Documentation
Beginning edits to Whatsnew 3.8
..
.. bpo: 37726
.. date: 2019-07-31-11-40-06
.. nonce: h-3o9a
.. section: Documentation
Stop recommending getopt in the tutorial for command line argument parsing
and promote argparse.
..
.. bpo: 37256
.. date: 2019-07-16-14-48-12
.. nonce: qJTrBb
.. section: Documentation
Fix wording of arguments for :class:`Request` in :mod:`urllib.request`
..
.. bpo: 37004
.. date: 2019-05-22-04-30-07
.. nonce: BRgxrt
.. section: Documentation
In the documentation for difflib, a note was added explicitly warning that
the results of SequenceMatcher's ratio method may depend on the order of the
input strings.
..
.. bpo: 36487
.. date: 2019-04-02-19-23-00
.. nonce: Jg6-MG
.. section: Documentation
Make C-API docs clear about what the "main" interpreter is.
..
.. bpo: 37805
.. date: 2019-08-25-19-51-46
.. nonce: Kl1sti
.. section: Tests
Add tests for json.dump(..., skipkeys=True). Patch by Dong-hee Na.
..
.. bpo: 37707
.. date: 2019-07-29-11-36-16
.. nonce: Sm-dGk
.. section: Build
Mark some individual tests to skip when --pgo is used. The tests marked
increase the PGO task time significantly and likely don't help improve
optimization of the final executable.
..
.. bpo: 37549
.. date: 2019-08-22-09-04-44
.. nonce: TpKI3M
.. section: Windows
:func:`os.dup` no longer fails for standard streams on Windows 7.
..
.. bpo: 1311
.. date: 2019-08-21-12-58-18
.. nonce: BoW1wU
.. section: Windows
The ``nul`` file on Windows now returns True from :func:`~os.path.exists`
and a valid result from :func:`os.stat` with ``S_IFCHR`` set.
..
.. bpo: 9949
.. date: 2019-08-14-13-40-15
.. nonce: zW45Ks
.. section: Windows
Enable support for following symlinks in :func:`os.realpath`.
..
.. bpo: 37834
.. date: 2019-08-12-12-00-24
.. nonce: VB2QVj
.. section: Windows
Treat all name surrogate reparse points on Windows in :func:`os.lstat` and
other reparse points as regular files in :func:`os.stat`.
..
.. bpo: 36266
.. date: 2019-08-08-18-05-27
.. nonce: x4eZU3
.. section: Windows
Add the module name in the formatted error message when DLL load fail
happens during module import in ``_PyImport_FindSharedFuncptrWindows()``.
Patch by Srinivas Nyayapati.
..
.. bpo: 25172
.. date: 2019-08-06-18-09-18
.. nonce: Akreij
.. section: Windows
Trying to import the :mod:`crypt` module on Windows will result in an
:exc:`ImportError` with a message explaining that the module isn't supported
on Windows. On other platforms, if the underlying ``_crypt`` module is not
available, the ImportError will include a message explaining the problem.
..
.. bpo: 37778
.. date: 2019-08-06-13-54-12
.. nonce: AY1XhH
.. section: Windows
Fixes the icons used for file associations to the Microsoft Store package.
..
.. bpo: 37734
.. date: 2019-08-06-09-35-12
.. nonce: EoJ9Nh
.. section: Windows
Fix use of registry values to launch Python from Microsoft Store app.
..
.. bpo: 28269
.. date: 2019-05-05-05-23-34
.. nonce: -MOHI7
.. section: Windows
Replace use of :c:func:`strcasecmp` for the system function
:c:func:`_stricmp`. Patch by Minmin Gong.
..
.. bpo: 18049
.. date: 2019-07-13-15-58-18
.. nonce: MklhQQ
.. section: macOS
Increase the default stack size of threads from 5MB to 16MB on macOS, to
match the stack size of the main thread. This avoids crashes on deep
recursion in threads.
..
.. bpo: 37824
.. date: 2019-08-26-00-41-53
.. nonce: YY5jAI
.. section: IDLE
Properly handle user input warnings in IDLE shell. Cease turning
SyntaxWarnings into SyntaxErrors.
..
.. bpo: 37929
.. date: 2019-08-24-22-00-33
.. nonce: jb7523
.. section: IDLE
IDLE Settings dialog now closes properly when there is no shell window.
..
.. bpo: 37849
.. date: 2019-08-14-09-43-15
.. nonce: -bcYF3
.. section: IDLE
Fixed completions list appearing too high or low when shown above the
current line.
..
.. bpo: 36419
.. date: 2019-08-04-17-10-01
.. nonce: TJZqOc
.. section: IDLE
Refactor IDLE autocomplete and improve testing.
..
.. bpo: 37748
.. date: 2019-08-04-15-27-50
.. nonce: 0vf6pg
.. section: IDLE
Reorder the Run menu. Put the most common choice, Run Module, at the top.
..
.. bpo: 37942
.. date: 2019-08-24-12-11-30
.. nonce: 7H8N9a
.. section: Tools/Demos
Improve ArgumentClinic converter for floats.
..
.. bpo: 37034
.. date: 2019-05-27-16-13-08
.. nonce: zbTgy8
.. section: Tools/Demos
Argument Clinic now uses the argument name on errors with keyword-only
argument instead of their position. Patch contributed by Rémi Lapeyre.
..
.. bpo: 36763
.. date: 2019-08-23-18-45-11
.. nonce: q3Kh8Z
.. section: C API
Options added by ``PySys_AddXOption()`` are now handled the same way than
``PyConfig.xoptions`` and command line ``-X`` options.
..
.. bpo: 37926
.. date: 2019-08-23-11-35-55
.. nonce: hnI5IQ
.. section: C API
Fix a crash in ``PySys_SetArgvEx(0, NULL, 0)``.