Mailman 3 November 2020 - Python-Dev

Why does "except Ex as x" not restore the previous value of x?
by Mark Shannon 19 Nov '20

19 Nov '20

Hi, I'm wondering why ``` x = "value" try: 1/0 except Exception as x: pass ``` does not restore "value" to x after the `except` block. There doesn't seem to be an explanation for this behavior in the docs or PEPs, that I can find. Nor does there seem to be any good technical reason for doing it this way. Anyone know why, or is just one of those unintended consequences like `True == 1`? Here's an example of restoring the value of the variable after the `except` block: >>> def f(x): ... try: ... 1/0 ... except Exception as x: ... pass ... return x ... >>> f("hi") 'hi' Cheers, Mark.

12 21

Yet another idea for pattern matching syntax
by Federico Salerno 19 Nov '20

19 Nov '20

I'm sorry, I've been skipping around the discussion a bit, but I'm fairly certain this suggestion hasn't been proposed yet. It's perhaps a bit too different from what has been proposed thus far but maybe that's exactly what's needed to convince the minds, since as far as I see it most of the parties who have an opinion on marking either assignments or lookups would at this point have changed their mind, if they were going to at all. What about declaring the identifiers that are going to be lookups in advance? Something like: match obj with some_var, something: case x, some_var: # here x binds, but some_var is a lookup I'm just throwing it out there because it occurred to me that this may solve the aesthetic issues while being clear on what identifier has what role. I'm sorry if this ends up just being more noise.

1 0

PEP 642 v2: Explicit constraint patterns *without* question marks in the syntax
by Nick Coghlan 18 Nov '20

18 Nov '20

Hi folks, I have updated PEP 642 significantly based on the feedback received over the past week. Since the Discourse thread hadn't received any comments on it, I amended the existing thread in place rather than making a new one: https://discuss.python.org/t/pep-642-constraint-pattern-syntax-for-structur… The full text of the PEP is quoted in the Discourse thread. The rendered version of the updated PEP can be found in the usual place: https://www.python.org/dev/peps/pep-0642/ Relative to the initially published version, the major changes are based primarily on the counterproposal that Steven D'Aprano posted: * Explicit equality constraints become "== EXPR" (replacing v1's "?EXPR") * Explicit identity constraints become "is EXPR" (replacing v1's "?is EXPR") * Inferred constraints are introduced to deal with the resulting verbosity problems. These mostly follow the same syntax as PEP 634 proposes for value patterns and literal patterns, but are defined in terms of the explicit constraints, rather than being the only way to request the desired semantics. While I considered ceding the point on using `_` as the wildcard marker (and had updated the PEP to say that), I couldn't bring myself to actually do it, especially after reading Thomas Wouters review of the current state of the pattern matching proposals. So instead this version proposes the use of `__` in that role, with an explanation of how that opens a path towards restoring language self-consistency in a future PEP by making `__` special everywhere, rather than only having it be special in match patterns. There are a few other changes that get down into the weeds of actually implementing these features in the compiler (like introducing a SkippedBinding node into the AST so most of the compiler doesn't need to care how the wildcard is spelled in the surface syntax), but I doubt those are going to matter to most folks in deciding which of the proposals on offer they prefer (or if they'd prefer continue without any pattern matching syntax at all). Cheers, Nick. -- Nick Coghlan | ncoghlan(a)gmail.com | Brisbane, Australia

15 32

Distro packagers: PEP 615 and the tzdata dependency
by Paul Ganssle 16 Nov '20

16 Nov '20

Hi all, One part of PEP 615 (IANA time zones) that I expected to be easily overlooked (a point about which I seem to have been right) is the recommendation that starting with Python 3.9, distros should add a dependency on the system time zone data to the Python package. Quoting the PEP: > Python distributors are encouraged to ensure that time zone data is > installed alongside Python whenever possible (e.g. by declaring tzdata > as a dependency for the python package). https://www.python.org/dev/peps/pep-0615/#system-time-zone-information I am not sure what is the best way to reach the largest number of distro packagers to suggest that they add a dependency on tzdata for Python 3.9+, so I figured I'd send a message here. If you know a distro packager who does not follow this list, or you use a distro that doesn't have a dependency on tzdata for Python 3.9, please forward this e-mail to them and/or open a bug on their issue tracker. So far I know conda-forge got the dependency right from the first Python 3.9 release, Fedora has plans to fix this <https://src.fedoraproject.org/rpms/python3.10/pull-request/13>, and Christian Heimes has opened a bug on the Ubuntu launchpad <https://bugs.launchpad.net/ubuntu/+source/python3.9/+bug/1904271> for this. I will figure out how best to notify Arch Linux and do that (since that's the distro I use). I suspect this will be most important for distros that are heavily used in containers, since tzdata is a common enough dependency that it's likely to be satisfied accidentally in most full-featured user environments anyway. Thanks! Paul P.S. If there's a mailing list or other community for Python distro packagers, please let me know, because I often find that we're making decisions that affect them that they don't hear about until way down the line. I'd love to have an easy way to keep them in the loop.

6 9

Steering Council Election Timeline for 2021 term
by Ewa Jodlowska 16 Nov '20

16 Nov '20

Hi! The timeline for this year's election will be the same as last year. * The nomination period will begin Nov 1, 2020 (do not post nominations until then) * Nomination period will end Nov 15, 2020 * Voting will begin Dec 1, 2020 * Voting will end Dec 15, 2020 Nominations will be collected via https://discuss.python.org/ (more details to follow on Nov 1). New for this year: Ernest W. Durbin III will be running the vote along with the assistance of Joe Carey, a PSF employee. They will be co-admins going forward. I have cc'ed them in on this thread as well in case there are any questions. Thanks, Ewa

3 2

Configure Python initialization (PyConfig) in Python
by Victor Stinner 15 Nov '20

15 Nov '20

Hi, If you embed Python in Python, I would like your opinion on https://bugs.python.org/issue42260 issue which adds a way to configure the Python initialization in Python. I'm looking for feedback from people who embed Python and have issues to configure Python as they wish. Simple example (just to show how the API would look like) setting the the bytes_warning option: ---------------- import _testinternalcapi import sys assert sys.flags.bytes_warning == 0 config = _testinternalcapi.get_config() # Copy PyConfig config['bytes_warning'] = 1 # regular Python dict _testinternalcapi.set_config(config) # Update PyConfig and sys assert sys.flags.bytes_warning == 1 ---------------- The example already works in the current master branch! The PyConfig structure has 53 members (+ 4 private members). You can configure many things: sys.argv, sys.path, stdout encoding, disable user site directory, etc. In Python 3.8, I implemented PEP 587 "Python Initialization Configuration" which is the concrete implementation of the first half of PEP 432 "Restructuring the CPython startup sequence". Python now provides a C API to configure every option of its initialization: https://docs.python.org/dev/c-api/init_config.html Nick Coghlan recently withdrew his PEP 432 since PEP 587 was rejected. It made me sad :-( I tried to implement the second half of the PEP 432: * [DONE] Introduce the most limited "core" initialization phase where Python only has builtin types and builtin modules (implemented as a provisional C API in the PEP 587, I fixed some issues recently). sys module is only partially initialized (no sys.path, no sys.stdout). Python should not access the file system in his phase. * [DONE] Only compute the Python path configuration during the main initialization, not during the core initialization. * [DONE] Ability to configure the Python initialization in Python. * [WIP] Rewrite Modules/getpath.c (1600 lines of C code) to Lib/_getpath.py (700 lines of Python code) See https://bugs.python.org/issue42260 for the work-in-progress. In Python 3.9, it's already possible to configure PyConfig in C. The idea here is to give the ability to do it in Python, but also to reimplement the old Modules/getpath.c as modern Python code. In my WIP PR 23169, I reimplemented getpath.c in two parts: * _getpath Python module: logic to build sys.path * _cgetpath C extension used by _getpath: minimum C code to expose Py_DecodeLocale() function and some constants in Python It will be easier to maintain and evolve _getpath.py, but also to write a test suite (right now, getpath.c has almost no test, see test_embed). Later, the idea would be to let applications embedding Python to execute their own code to configure Python initialization options (PyConfig) in Python between the "core" initialization phase and the "main" initialization (Python fully initialized). It should not be run after the main initialization, since the configuration is used to configure Python during the main initialization. From a practical point of view, executing Python code to initialize Python requires freezing this code as a frozen module (as I did for _getpath.py in my PR). I don't know if it's easy to do that in an application embedding Python right now. My remaining problem is that my PR changes PyConfig_Read(): it no longer computes the Python Path Configuration, since it is now implemented in Python. IMO it's an acceptable drawback compared to the benefit of these new features. Victor -- Night gathers, and now my watch begins. It shall not end until my death.

2 2

Please do not remove random bits of information from the tutorial
by Riccardo Polignieri 15 Nov '20

15 Nov '20

Dear all, I am the maintainer of an Italian translation of the Python Tutorial: https://pytutorial-it.readthedocs.io. Since the Italian translation is kept in sync with the original repo (across all the branches!), from time to time I get an alert when a change is committed. This morning I noticed this new commit, referring to bpo-42179: "Remove mention of __cause__" (https://bugs.python.org/issue42179). From reading this thread, it turns out that a minor confusion in the wording, about __cause__ and __context__, very quickly turned into the decision to completely remove any reference to __cause__, the reason being that "generally speaking (...) we should *reduce* some details from tutorial". While I have no particular opinion on this specific case, I would strongly urge you not to remove random bits of information from the tutorial, even when a link to a specific article is handy. We all know that the tutorial is "too difficult", not really suitable for beginners (perhaps not even Python beginners!). Having spent a couple of weeks translating it as recently as this spring, I am well aware of this. At times, it feels more like a demo or a features' showcase: a feeling reinforced, by the way, often by the *recent* additions like the special parameters syntax (https://docs.python.org/3/tutorial/controlflow.html#special-parameters). However, unless someone undertakes a sweeping rewriting of the tutorial (and until they do), I think it would be unwise to start cherry-picking the occasional bit of information to expunge or "simplify" from time to time, without an overall guideline. Reason is, right now the tutorial is packed with informations (beginner-unfriendly as they might be) that you would be hard pressed to find elsewhere in the documentation: see the aforementioned section on special parameters; see the maddening chapter on Classes (and especially the exposition on scopes and namespaces); see, of course, the floating point appendix; and I could go on. My concern here is that if you start removing or simplifying some "too-difficult-for-a-tutorial" bits of information on an occasional basis, and without too much scrutiny or editorial guidance, you will end up loosing something precious. Like everyone, I also look forward to an overall rewriting of the tutorial; but in the meantime, I would kindly ask you to be very careful and conservative about deleting information solely for "didactic" reasons. thanks a lot riccardo polignieri

17 32

Pointy brackets for value patterns in Structural Pattern Matching
by Richard Kleijn 13 Nov '20

13 Nov '20

(my first post here after years of lurking) PEP 635 mentions: "A proposed rule to use a leading dot (e.g. .CONSTANT) for that purpose was criticised because it was felt that the dot would not be a visible-enough marker for that purpose. Partly inspired by forms found in other programming languages, a number of different markers/sigils were proposed (such as ^CONSTANT, $CONSTANT, ==CONSTANT, CONSTANT?, or the word enclosed in backticks), although there was no obvious or natural choice." Did anyone consider using pointy brackets to express a value pattern? To me they feel much more natural than the dismissed sigils/markers mentioned above. Searching the mailing list it seems that so far pointy brackets only have been proposed for *capture* patterns. I just read the thread David Mertz recently started (on the idea to use words rather than sigils). It occurred to me that the example he used can be quite neatly expressed using pointy brackets: NOT_FOUND = 404 match http_code: case 200: print("OK document") case <NOT_FOUND>: # use the variable value print("Document not found") case other_code: # bind this name print("Other HTTP code", other_code) There is also some precedent for syntax like this. Everyone who has seen command-line interface descriptions such as: Usage: my_program <host> <port> will be able to intuitively grasp the meaning that it is about the *value* of the thing between the pointy brackets. Could this be a viable idea? Best regards, Richard

1 0

Re: PEP 642 v2: Explicit constraint patterns *without* question marks in the syntax
by Paul Sokolovsky 13 Nov '20

13 Nov '20

Hello, [Re-routed back to python-dev.] On Thu, 12 Nov 2020 20:04:57 +0100 Piotr Duda <duda.piotr(a)gmail.com> wrote: [] > > match foo: > > case ("foo", >val1): > > ... > > case ("bar", >val2): > > ... > > > > I agree with that, though I would prefer using other symbol than > (? > or $), one of reasons would by it would look better as "match all" > target, other one that in future. it would allow extending syntax for > simple guards like ?x < 100. Question of "what to mark with sigils - terms-used-as-values or terms-used-for-capturing" is orthogonal to the question of "what to use as match-all symbol", though I understand the desire to repurpose the same symbol for both. For a capturing sigil, "->", ">", ">>", "@", "?", "$" already were or can be proposed. The benefit of "->", ">", ">>" is that they're very intuitive. I'd also have preference for shorter one, because 2-chars are really verbose IMHO. OTOH, ">" has issue with parsing ambiguity unless separated by spaces ("Cls(kw1=>var)"). "$" is the worst choice IMHO, because intuitively (based on other languages - shell, etc.) it says "use the value of variable". That said, those are 2nd-level choices. The current stage is to accept the fact that "mark capturing terms" is *very viable* alternative to "mark terms to use as values" (3rd choices - "use adhoc interpretation of non-orthogonal syntactic conventions" - being the worst). But people behind PEPs keep ignoring that choice - silently, or with minimal consideration/commentary. -- Best regards, Paul mailto:pmiscml@gmail.com

5 8

Summary of Python tracker Issues
by Python tracker 13 Nov '20

13 Nov '20

ACTIVITY SUMMARY (2020-11-06 - 2020-11-13) Python tracker at https://bugs.python.org/ To view or respond to any of the issues listed below, click on the issue. Do NOT respond to this message. Issues counts and deltas: open 7628 (+11) closed 46459 (+62) total 54087 (+73) Open issues with patches: 3064 Issues opened (60) ================== #32426: Tkinter: reference document of possible cursor names https://bugs.python.org/issue32426 reopened by terry.reedy #32682: test_zlib improve version parsing https://bugs.python.org/issue32682 reopened by pmpp #40077: Convert static types to heap types: use PyType_FromSpec() https://bugs.python.org/issue40077 reopened by pitrou #40137: TODO list when PEP 573 "Module State Access from C Extension M https://bugs.python.org/issue40137 reopened by vstinner #40939: Remove the old parser https://bugs.python.org/issue40939 reopened by vstinner #41832: PyType_FromSpec() should accept tp_doc=NULL https://bugs.python.org/issue41832 reopened by petr.viktorin #42131: [zipimport] Update zipimport to use specs https://bugs.python.org/issue42131 reopened by brett.cannon #42273: Using LazyLoader leads to AttributeError https://bugs.python.org/issue42273 reopened by brett.cannon #42280: The list of standard generic collections is incomplete https://bugs.python.org/issue42280 opened by jack1142 #42281: Inconsistent ProcessPoolExecutor behaviour on macOS between 3. https://bugs.python.org/issue42281 opened by mustafaquraish #42286: f_trace gets call on different lines each loop https://bugs.python.org/issue42286 opened by MegaIng #42287: Use Py_NewRef & Py_XNewRef where applicable https://bugs.python.org/issue42287 opened by Yonatan Goldschmidt #42289: Found a secret/private key in code. https://bugs.python.org/issue42289 opened by krrishdhaneja #42290: Unicode inconsistent display after concencated https://bugs.python.org/issue42290 opened by xxm #42291: Incorrect signature of CodeType.replace() https://bugs.python.org/issue42291 opened by serhiy.storchaka #42292: C API: Allocating Objects on the Heap. Misleading documentatio https://bugs.python.org/issue42292 opened by igo95862 #42293: Installation of pyinstaller in Windows fails with utf8 error https://bugs.python.org/issue42293 opened by giomach #42294: [C API] Add new C functions with more regular reference counti https://bugs.python.org/issue42294 opened by vstinner #42297: [argparse] Bad error message formatting when using custom usag https://bugs.python.org/issue42297 opened by TurboTurtle #42298: Documented interaction of single-stage init and sub-interprete https://bugs.python.org/issue42298 opened by pkerling #42299: Add test_formatter (or remove deprecated formatter module?) https://bugs.python.org/issue42299 opened by terry.reedy #42300: Typo in translation to portuguese https://bugs.python.org/issue42300 opened by ronan.soares #42302: [Turtle] Add clockwise and anticlockwise method as alias to ri https://bugs.python.org/issue42302 opened by zenr #42304: [easy C] long type performance waste in 64-bit Windows build https://bugs.python.org/issue42304 opened by malin #42305: Added Auto_Complete DropBox Suggestion For Tkinter https://bugs.python.org/issue42305 opened by RajvirSingh1313 #42306: wrong exception handling in case asyncio.shiled usage https://bugs.python.org/issue42306 opened by Alex Alex #42307: make install must not copy python.o into $prefix/lib/python3.1 https://bugs.python.org/issue42307 opened by vstinner #42309: BUILD: AIX-64-bit segmentation fault https://bugs.python.org/issue42309 opened by Michael.Felt #42315: `python -m` semantics conflict with `__file__`'s being optiona https://bugs.python.org/issue42315 opened by William.Schwartz #42316: Walrus Operator in list index https://bugs.python.org/issue42316 opened by Brando753 #42317: Docs of `typing.get_args`: Mention that due to caching of typi https://bugs.python.org/issue42317 opened by Dominik V. #42318: [tkinter] surrogate pairs in Tcl/Tk string when pasting an emo https://bugs.python.org/issue42318 opened by ronaldoussoren #42321: Limitations of building a static python library on Windows (MS https://bugs.python.org/issue42321 opened by maarten #42322: Spectre mitigations in CPython interpreter https://bugs.python.org/issue42322 opened by sahnaseredini #42323: [AIX] test_math: test_nextafter(float('nan'), 1.0) does not re https://bugs.python.org/issue42323 opened by vstinner #42324: Doctest: directives https://bugs.python.org/issue42324 opened by konrad.schwarz #42325: UnicodeDecodeError executing ./setup.py during build https://bugs.python.org/issue42325 opened by skip.montanaro #42327: Add PyModule_Add() https://bugs.python.org/issue42327 opened by serhiy.storchaka #42328: ttk style.map function incorrectly handles the default state f https://bugs.python.org/issue42328 opened by patthoyts #42330: Add browsh in the webbrowser module https://bugs.python.org/issue42330 opened by saiansh2525 #42332: add __weakref__ to types.GenericAlias https://bugs.python.org/issue42332 opened by tinchester #42333: Port ssl module to heap types and module state (PEP 573) https://bugs.python.org/issue42333 opened by christian.heimes #42334: Subclassing int and complex with keyword arguments weird https://bugs.python.org/issue42334 opened by autospamfighter #42335: Python Crashes Exception code 0xc0000374 ntdll.dll https://bugs.python.org/issue42335 opened by strantor #42336: Make PCbuild/build.bat build x64 by default https://bugs.python.org/issue42336 opened by steve.dower #42337: Skip building web installers on Windows https://bugs.python.org/issue42337 opened by steve.dower #42338: Enable Debug Build For Python Native Modules in Windows, with https://bugs.python.org/issue42338 opened by jmoguill2 #42339: official embedded Python fails to import certain modules https://bugs.python.org/issue42339 opened by bughunter2 #42340: KeyboardInterrupt should come with a warning https://bugs.python.org/issue42340 opened by benfogle #42341: xml.dom.minidom parsing omits Text nodes in top level https://bugs.python.org/issue42341 opened by vapier #42342: asyncio.open_connection(local_addr=('localhost', port)) fails https://bugs.python.org/issue42342 opened by ecatmur2 #42343: threading.local documentation should be on the net... https://bugs.python.org/issue42343 opened by ztane #42344: SimpleNamespace: update documentation regarding comparison https://bugs.python.org/issue42344 opened by jugmac00 #42345: Equality of typing.Literal depends on the order of arguments https://bugs.python.org/issue42345 opened by Dominik V. #42346: [subinterpreters] Deny os.fork() in subinterpreters? https://bugs.python.org/issue42346 opened by vstinner #42347: loop.call_exception_handler documentation is lacking https://bugs.python.org/issue42347 opened by sorrel #42348: Language Reference: Set items https://bugs.python.org/issue42348 opened by BTaskaya #42349: Compiler front-end produces a broken CFG https://bugs.python.org/issue42349 opened by Mark.Shannon #42350: Calling os.fork() at Python exit logs: AttributeError: 'NoneTy https://bugs.python.org/issue42350 opened by vstinner #42351: Setup.py: UnicodeDecodeError in grep_headers_for https://bugs.python.org/issue42351 opened by epaine Most recent 15 issues with no replies (15) ========================================== #42351: Setup.py: UnicodeDecodeError in grep_headers_for https://bugs.python.org/issue42351 #42350: Calling os.fork() at Python exit logs: AttributeError: 'NoneTy https://bugs.python.org/issue42350 #42349: Compiler front-end produces a broken CFG https://bugs.python.org/issue42349 #42347: loop.call_exception_handler documentation is lacking https://bugs.python.org/issue42347 #42346: [subinterpreters] Deny os.fork() in subinterpreters? https://bugs.python.org/issue42346 #42343: threading.local documentation should be on the net... https://bugs.python.org/issue42343 #42342: asyncio.open_connection(local_addr=('localhost', port)) fails https://bugs.python.org/issue42342 #42341: xml.dom.minidom parsing omits Text nodes in top level https://bugs.python.org/issue42341 #42340: KeyboardInterrupt should come with a warning https://bugs.python.org/issue42340 #42339: official embedded Python fails to import certain modules https://bugs.python.org/issue42339 #42338: Enable Debug Build For Python Native Modules in Windows, with https://bugs.python.org/issue42338 #42337: Skip building web installers on Windows https://bugs.python.org/issue42337 #42335: Python Crashes Exception code 0xc0000374 ntdll.dll https://bugs.python.org/issue42335 #42330: Add browsh in the webbrowser module https://bugs.python.org/issue42330 #42328: ttk style.map function incorrectly handles the default state f https://bugs.python.org/issue42328 Most recent 15 issues waiting for review (15) ============================================= #42350: Calling os.fork() at Python exit logs: AttributeError: 'NoneTy https://bugs.python.org/issue42350 #42349: Compiler front-end produces a broken CFG https://bugs.python.org/issue42349 #42344: SimpleNamespace: update documentation regarding comparison https://bugs.python.org/issue42344 #42340: KeyboardInterrupt should come with a warning https://bugs.python.org/issue42340 #42333: Port ssl module to heap types and module state (PEP 573) https://bugs.python.org/issue42333 #42332: add __weakref__ to types.GenericAlias https://bugs.python.org/issue42332 #42328: ttk style.map function incorrectly handles the default state f https://bugs.python.org/issue42328 #42327: Add PyModule_Add() https://bugs.python.org/issue42327 #42317: Docs of `typing.get_args`: Mention that due to caching of typi https://bugs.python.org/issue42317 #42307: make install must not copy python.o into $prefix/lib/python3.1 https://bugs.python.org/issue42307 #42299: Add test_formatter (or remove deprecated formatter module?) https://bugs.python.org/issue42299 #42294: [C API] Add new C functions with more regular reference counti https://bugs.python.org/issue42294 #42291: Incorrect signature of CodeType.replace() https://bugs.python.org/issue42291 #42278: Remove usage of tempfile.mktemp in stdlib https://bugs.python.org/issue42278 #42277: Solaris & PEP 3149: start using ABI version tagged .so files https://bugs.python.org/issue42277 Top 10 most discussed issues (10) ================================= #42260: [C API] Add PyInterpreterState_SetConfig(): reconfigure an int https://bugs.python.org/issue42260 10 msgs #42294: [C API] Add new C functions with more regular reference counti https://bugs.python.org/issue42294 10 msgs #42307: make install must not copy python.o into $prefix/lib/python3.1 https://bugs.python.org/issue42307 10 msgs #42225: Tkinter hangs or crashes when displaying astral chars https://bugs.python.org/issue42225 9 msgs #42273: Using LazyLoader leads to AttributeError https://bugs.python.org/issue42273 9 msgs #41987: singledispatchmethod raises an error when relying on a forward https://bugs.python.org/issue41987 8 msgs #42085: Add dedicated slot for sending values https://bugs.python.org/issue42085 8 msgs #42302: [Turtle] Add clockwise and anticlockwise method as alias to ri https://bugs.python.org/issue42302 7 msgs #42318: [tkinter] surrogate pairs in Tcl/Tk string when pasting an emo https://bugs.python.org/issue42318 7 msgs #42327: Add PyModule_Add() https://bugs.python.org/issue42327 7 msgs Issues closed (65) ================== #2931: optparse: various problems with unicode and gettext https://bugs.python.org/issue2931 closed by vstinner #6225: Fixing several minor bugs in Tkinter.Canvas and one in Misc._c https://bugs.python.org/issue6225 closed by iritkatriel #6860: Inconsistent naming of custom command in setup.py help output https://bugs.python.org/issue6860 closed by iritkatriel #8488: Docstrings of non-data descriptors "ignored" https://bugs.python.org/issue8488 closed by iritkatriel #8730: Spurious test failure in distutils https://bugs.python.org/issue8730 closed by iritkatriel #9849: Argparse needs better error handling for nargs https://bugs.python.org/issue9849 closed by iritkatriel #10709: Misc/AIX-NOTES needs updating https://bugs.python.org/issue10709 closed by iritkatriel #12625: sporadic test_unittest failure https://bugs.python.org/issue12625 closed by iritkatriel #14367: try/except block in ismethoddescriptor() in inspect.py, so tha https://bugs.python.org/issue14367 closed by iritkatriel #14903: dictobject infinite loop in module set-up https://bugs.python.org/issue14903 closed by gregory.p.smith #16830: Add skip_host and skip_accept_encoding to HTTPConnection.reque https://bugs.python.org/issue16830 closed by iritkatriel #18148: Make of Python 3.2.2 fails on Solaris SPARC https://bugs.python.org/issue18148 closed by iritkatriel #20543: ** operator does not overflow to inf https://bugs.python.org/issue20543 closed by iritkatriel #24831: Load average in test suite too high https://bugs.python.org/issue24831 closed by vstinner #25259: readline macros can segfault Python https://bugs.python.org/issue25259 closed by vstinner #25460: Misc/.gdbinit uses preprocessor macro https://bugs.python.org/issue25460 closed by iritkatriel #27182: PEP 519 support in the stdlib https://bugs.python.org/issue27182 closed by brett.cannon #27408: Document importlib.abc.ExecutionLoader implements get_data() https://bugs.python.org/issue27408 closed by brett.cannon #28491: Remove bundled libffi for OSX https://bugs.python.org/issue28491 closed by ronaldoussoren #31359: `configure` script incorrectly detects symbols as available on https://bugs.python.org/issue31359 closed by ronaldoussoren #34597: Python needs to check existence of functions at runtime for ta https://bugs.python.org/issue34597 closed by ronaldoussoren #36310: pygettext3.7 Does Not Recognize gettext Calls Within fstrings https://bugs.python.org/issue36310 closed by BTaskaya #37586: macOS: posix_spawn(..., setsid=True) https://bugs.python.org/issue37586 closed by ronaldoussoren #39892: Enable DeprecationWarnings by default when not explicit in uni https://bugs.python.org/issue39892 closed by gregory.p.smith #39931: Global variables are not accessible from child processes (mult https://bugs.python.org/issue39931 closed by josh.r #40624: add support for != (not-equals) in ElementTree XPath https://bugs.python.org/issue40624 closed by scoder #41073: [C API] PyType_GetSlot() should accept static types https://bugs.python.org/issue41073 closed by petr.viktorin #41126: Running test suite gives me - python.exe(14198,0x114352dc0) ma https://bugs.python.org/issue41126 closed by ronaldoussoren #41543: contextlib.nullcontext doesn't work with async context manager https://bugs.python.org/issue41543 closed by asvetlov #41712: REDoS in purge https://bugs.python.org/issue41712 closed by steve.dower #41754: Webbrowser Module Cannot Find xdg-settings on OSX https://bugs.python.org/issue41754 closed by ronaldoussoren #42014: shutil.rmtree calls onerror with different function than faile https://bugs.python.org/issue42014 closed by hynek #42086: AST: Document / re-design? the simple constructor nodes from s https://bugs.python.org/issue42086 closed by BTaskaya #42103: [security] DoS (MemError via CPU and RAM exhaustion) when proc https://bugs.python.org/issue42103 closed by serhiy.storchaka #42133: Update the stdlib to fall back to __spec__.loader if __loader_ https://bugs.python.org/issue42133 closed by brett.cannon #42140: asyncio.wait function creates futures set two times https://bugs.python.org/issue42140 closed by asvetlov #42171: Add PEP 573 to the stable ABI https://bugs.python.org/issue42171 closed by petr.viktorin #42183: Stack overflow error with asyncio.all_tasks and wait_for https://bugs.python.org/issue42183 closed by asvetlov #42233: GenericAlias does not support union type expressions https://bugs.python.org/issue42233 closed by kj #42237: test_socket.SendfileUsingSendfileTest fails on illumos https://bugs.python.org/issue42237 closed by asvetlov #42267: Python 3.9 broken installer https://bugs.python.org/issue42267 closed by JackSkellington #42275: Jupyter Lab Terminals not available (error was No module named https://bugs.python.org/issue42275 closed by shakir_juolay #42279: replacements function corrupts file https://bugs.python.org/issue42279 closed by zach.ware #42282: Constant folding is skipped in named expressions https://bugs.python.org/issue42282 closed by ncoghlan #42283: test_idle is interactive on macOS 11 https://bugs.python.org/issue42283 closed by ned.deily #42284: The grammar specification is inconsistent with the implementat https://bugs.python.org/issue42284 closed by rhettinger #42285: Missing spaces in list literals in Tutorial/Data Structures https://bugs.python.org/issue42285 closed by rhettinger #42288: typing.get_type_hints() returns Optional[Any] if the default v https://bugs.python.org/issue42288 closed by gvanrossum #42295: Error should be flagged if Walrus operator is used for multipl https://bugs.python.org/issue42295 closed by BTaskaya #42296: Infinite loop uninterruptable on Windows in 3.10 https://bugs.python.org/issue42296 closed by vstinner #42301: Add function to exploit heapq structure to locate an index of https://bugs.python.org/issue42301 closed by rhettinger #42303: I found a bug while checking string with find() https://bugs.python.org/issue42303 closed by serhiy.storchaka #42308: Add threading.__excepthook__ similar to sys.__excepthook__ https://bugs.python.org/issue42308 closed by vstinner #42310: for loop creates element in defaultdict https://bugs.python.org/issue42310 closed by larry #42311: It seems like ctypes code makes truncated pointer values in x6 https://bugs.python.org/issue42311 closed by eryksun #42312: sys.prefix is set incorrectly on Mac OS X https://bugs.python.org/issue42312 closed by ronaldoussoren #42313: rstrip removes the trailing `e`s. https://bugs.python.org/issue42313 closed by zach.ware #42314: Incorrect documentation entry for venv https://bugs.python.org/issue42314 closed by vinay.sajip #42319: The `functools.singledispatchmethod` example in the document c https://bugs.python.org/issue42319 closed by hongweipeng #42320: unexpected difference between map and list https://bugs.python.org/issue42320 closed by Pierre van de Laar #42326: Add verify_callback hook capability to the SSL lib https://bugs.python.org/issue42326 closed by christian.heimes #42329: typing classes do not have __name__ attributes in 3.7+ https://bugs.python.org/issue42329 closed by gregory.p.smith #42331: 'base64' has no attribute 'decodestring' https://bugs.python.org/issue42331 closed by xtreak #1487481: Could BIND_FIRST be removed on HP-UX? https://bugs.python.org/issue1487481 closed by iritkatriel #1475692: replacing obj.__dict__ with a subclass of dict https://bugs.python.org/issue1475692 closed by rhettinger

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