Mailman 3 December 2020 - Python-Dev

nanosecond stat fields, but not os.path methods ?
by Mats Wichmann Dec. 7, 2020

Dec. 7, 2020

there are stat fields now for ns precision, e.g. st_mtime now has an analogue st_mtime_ns. But os.path didn't grow corresponding methods - there's an os.path.getmtime but not _ms. Was that intentional? The wrappers in genericpath.py are trivial and arguably aren't particularly needed, but still curious...

6 6

TypedDict behavior
by Paul Bryan Dec. 7, 2020

Dec. 7, 2020

Is this the expected behavior? Python 3.9.0 (default, Oct 7 2020, 23:09:01) [GCC 10.2.0] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import typing >>> TD = typing.TypedDict("TD", {"a": str}, total=False) >>> TD.__total__ False >>> TD.__required_keys__ frozenset({'a'}) >>> TD.__optional_keys__ frozenset() >>> It seems to me "a" should not be a required key, but in fact an optional key.

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Pattern Matching controversy: Don't read PEP 635, read DLS'20 paper instead
by Paul Sokolovsky Dec. 6, 2020

Dec. 6, 2020

Hello, As was mentioned many times on the list, PEP634-PEP636 are thoroughly prepared and good materials, many thanks to their authors. PEP635 "Motivation and Rationale" (https://www.python.org/dev/peps/pep-0635/) stands out among the 3 however: while reading it, chances that you'll get a feeling of "residue", accumulating a section over section. By the end of reading, you may get a well-formed feeling that you've read a half-technical, half-marketing material, which is intended to "sell" a particular idea among many other very viable ideas, by shoehorning some concepts, downplaying other ideas, and at the same time, light-heartedly presenting drawbacks of its subject one. Just to give one example, literally at the very beginning, at the "Pattern Matching and OO" section (3rd heading) it says: > Pattern matching is complimentary to the object-oriented paradigm. It's not until the very end of document, in the "History and Context" it tells the whole truth: > With its emphasis on abstraction and encapsulation, object-oriented > programming posed a serious challenge to pattern matching. You may wonder how "complimentary" and "posed a serious challenge" relate to each other. While they're definitely not contradictory, starting the document with light-hearted "complimentary" can be seen as trying to set the stage where readers don't pay enough attention to the problem. And it kinda worked: only now [1] wider community discovers the implications of "Class Patterns" choices. (As a note, PEP635 does well on explaining them, and I'm personally sold on that, but it's *tough* choice, not the *obvious* choice). There're many more examples like that in the PEP635, would take too much space to list them all. However, PEP635 refers to the paper: > Kohn et al., Dynamic Pattern Matching with Python > https://doi.org/10.1145/3426422.3426983 (Accepted by DLS 2020. The > link will go live after Nov. 17; a preview PDF can be obtained from > the first author.) As that citation suggests, the paper is not directly linked from the PEP635. But the preprint is now accessible from the conference page, https://conf.researchr.org/home/dls-2020?#event-overview (direct link as of now: https://gvanrossum.github.io//docs/PyPatternMatching.pdf). That paper is written at much higher academic standard, and a pleasure to read. I recommend it to everyone who read PEP635 (note that it was written with PEP622 in mind, but conceptual differences are minor). With it, I noticed just 2 obvious issues: Section 4.3. Named Constants > It would clearly be desirable to allow named constants in patterns > as a replacement and extension of literals. However, Python has no > concept of a constant, i.e. all variables are mutable (even where > the values themselves are immutable). So, unlike PEP635, the paper pinpoints right the root of PEP634's problems: lack of constants in Python (on the language level). This is just the point which was raised on the mailing list either (https://mail.python.org/archives/list/python-dev@python.org/message/WV2UA4A…). Under strict academic peer review, the paper would have been returned for elaboration, with a note like: "Given that nowadays many dynamic languages (PHP, JavaScript, Lua, etc.) have support for constants, and lack of constants poses a serious usability challenge to your proposal, please explain why you chose to proceed anyway (and apply workarounds), instead of first introducing the concept of constants to the language. (Given that amount of work to implement pattern matching is certainly an order of magnitude larger than to introduce constants)." But the paper wasn't returned for elaboration, so we'll keep wondering why the authors chose such a backward process. Section 6.1. Scope > The granularity of the scope of local variables is at the level of > functions and frames. [...] > The only way to restrict the scope of a variable to part of a > function’s body (such as a case clause) would be to actively delete > the variable when leaving the block. This would, however, not restore > any previous value of a local variable in the function’s scope. This is a misconception ("the only way") which is repeated almost one to one on PEP635 either. If anything, the above describes how pseudo-scoping is currently implemented for exception vars in "except Exception as e:" clause (more info: https://mail.python.org/pipermail/python-dev/2019-January/155991.html), which is hardly a "best practice", and definitely not the only way. How to support multiple variable scopes in one stack frame is not a rocket science at all. One just need to remember how C did that since ~forever. And that's: (for unoptimized programs) variables in different scopes live in disjoint subsections of a frame. (For optimized programs, variables with disjoint liveness can share the same locations in a frame). The only reasons for not implementing the same solution in Python would be intertia of thought and "but it's not done anywhere else in Python". Yeah, but nobody del'eted local variables behind users' backs either, before somebody started to do that for exception clause variables. And the whole of pattern matching is such that either one thing, or another, but will be done for the first time in Python. For example, nobody before could imagine that one can write "Point(x, y)", and get x and y assigned, and now we're facing just that [1]. (Again, I personally love it, though think that "Point(>x, >y)" is an interesting option to address the tensions). In that regard, the current PEP634 and friends miss too many interesting and useful opportunities (constants in language core and true scoping for match'es, to name a few). Well, that happens. But they try to shoehorn too much of "we didn't do" into "it's not possible" or "it doesn't make sense", or "let's workaround it in adhoc ways" and that raises eyebrows, leading to concerns of whether the proposals are actually "raw" as of yet. [1] People expressing surprise at "Class Patterns" syntax: https://mail.python.org/archives/list/python-dev@python.org/message/F66J72J… https://mail.python.org/archives/list/python-dev@python.org/message/Q2ARJUL… -- Best regards, Paul mailto:pmiscml@gmail.com

10 23

Pattern Matching Scope
by Jim J. Jewett Dec. 4, 2020

Dec. 4, 2020

[Steven D'Aprano steve(a)pearwood.info responding to Paul Sokolovsky] wrote: > > Let us be clear: failed matches do not affect > > surrounding > > namespaces unless you declare capture variables as global or > > nonglobal. They might affect the current namespace, but not > > surrounding namespaces. Failed matches will not leak out to > > surrounding namespaces. > > The problem is that intuitively (just like with "for"), > "case a, b if a != b:" opens a new namespace for "a" and "b". That's why > I talk about "surrounding namespace". Then if a particular case > matching succeeds, weak of us (myself including) expect "a" and "b" > to magically appear outside the "case" too. But if the case didn't > match, nope, I don't expect "a" and "b" to appear there, it's not > intuitive at all ;-). I'm getting a bit confused over when people mean "the PEP currently says" vs "the implementation probably should" vs "the PEP should additionally require" vs "the PEP should instead say". To be more specific, I'm not sure what is intended for the 2nd or 3rd case below, which reuse a variable "bound" by the first (failed) match. Nor am I sure whether it matters that the first match fails on the guard predicate, instead of immediately on the match. case (a, b, c) if f(): # assume f() returns false case (a, b) if a == c: # is a still bound from case above? Is that implementation-dependent? case (d = a): # is a still bound from case above? Is that implementation-dependent? Is it even still possible to put restrictions in before the guard clause, like d=4? My previous belief was that this was implementation defined, because the cases could be processed in parallel, so that the first case might not have finished by the time variable a was needed in the later cases. My reading of PEP 634 suggests that there is a linearization, but only of the guards, so ... now I am not sure. -jJ

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Summary of Python tracker Issues
by Python tracker Dec. 4, 2020

Dec. 4, 2020

ACTIVITY SUMMARY (2020-11-27 - 2020-12-04) 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 7561 (-18) closed 46745 (+103) total 54306 (+85) Open issues with patches: 3050 Issues opened (53) ================== #41879: Outdated description of async iterables in documentation of as https://bugs.python.org/issue41879 reopened by nickgaya #42491: Tkinter wait_visibility hanging when used in thread https://bugs.python.org/issue42491 opened by spcmicro #42492: [unittest] Missing docs for context manager attributes https://bugs.python.org/issue42492 opened by jayman #42498: smtplib is glitchy after receive server code 500 https://bugs.python.org/issue42498 opened by izomiac #42504: Failure to build with MACOSX_DEPLOYMENT_TARGET=11 on Big Sur https://bugs.python.org/issue42504 opened by fxcoudert #42507: test_ttk_guionly test failures on macOS with Tcl/Tk 8.6.10 https://bugs.python.org/issue42507 opened by ned.deily #42508: macOS IDLE with Tk 8.6.10 in 3.9.1rc1 universal2 installer fai https://bugs.python.org/issue42508 opened by ned.deily #42512: typing: Confusing that BinaryIO and IO[bytes] cannot be used i https://bugs.python.org/issue42512 opened by conchylicultor #42513: Socket.recv hangs https://bugs.python.org/issue42513 opened by Barney Stratford #42514: Relocatable framework for macOS https://bugs.python.org/issue42514 opened by gregneagle #42516: Add function to get caller's name https://bugs.python.org/issue42516 opened by steve.dower #42517: Enum: do not convert private names into members https://bugs.python.org/issue42517 opened by ethan.furman #42519: [C API] Upgrade the C API in extension modules https://bugs.python.org/issue42519 opened by vstinner #42520: add_dll_directory only accepts absolute paths https://bugs.python.org/issue42520 opened by Antony.Lee #42524: pdb access to return value https://bugs.python.org/issue42524 opened by Romuald #42525: Optimize class/module level annotation https://bugs.python.org/issue42525 opened by uriyyo #42526: Exceptions in asyncio.Server callbacks are not retrievable https://bugs.python.org/issue42526 opened by tmewett #42527: UnicodeEncode error in BaseHttpRequestHandler class when send https://bugs.python.org/issue42527 opened by wangyanfeng.p #42528: Improve the docs of most Py*_Check{,Exact} API calls https://bugs.python.org/issue42528 opened by antocuni #42529: CPython DLL initialization routine failed from PYC cache file https://bugs.python.org/issue42529 opened by Thrameos #42531: importlib.resources.path() raises TypeError for packages witho https://bugs.python.org/issue42531 opened by William.Schwartz #42532: spec_arg's __bool__ is called while initializing NonCallableMo https://bugs.python.org/issue42532 opened by idanweiss97 #42533: Document encodings.idna limitations https://bugs.python.org/issue42533 opened by rixx #42534: venv does not work correctly when imported from .zip https://bugs.python.org/issue42534 opened by jussienko #42535: unittest.patch confuses modules with base modules https://bugs.python.org/issue42535 opened by twolodzko #42536: Iterating on a zip keeps objects alive longer than expected (t https://bugs.python.org/issue42536 opened by vstinner #42538: AsyncIO strange behaviour https://bugs.python.org/issue42538 opened by Alexander-Greckov #42539: Missing parenthesis in `platform._sys_version_parser` https://bugs.python.org/issue42539 opened by crazy95sun #42540: Debug pymalloc crash when using os.fork() [regression] https://bugs.python.org/issue42540 opened by CendioOssman #42541: Tkinter colours wrong on MacOS universal2 https://bugs.python.org/issue42541 opened by epaine #42542: weakref documentation does not fully describe proxies https://bugs.python.org/issue42542 opened by rgov #42543: case sensitivity in open() arguments https://bugs.python.org/issue42543 opened by sean.grogan #42544: In windows, asyncio.run_in_executor strips logger class inform https://bugs.python.org/issue42544 opened by adsherman09 #42545: Check that all symbols in the limited ABI are exported https://bugs.python.org/issue42545 opened by pablogsal #42547: argparse: add_argument(... nargs='+', metavar=<tuple>) does no https://bugs.python.org/issue42547 opened by m_khvoinitsky #42548: debugger stops at breakpoint of `pass` that is not actually re https://bugs.python.org/issue42548 opened by gatekeeper.mail #42549: "quopri" line endings not standard conform https://bugs.python.org/issue42549 opened by dmaurer #42551: Generator `yield`s counted as primitive calls by cProfile https://bugs.python.org/issue42551 opened by matthew.suozzo #42552: Automatically set parent thread idents on thread start https://bugs.python.org/issue42552 opened by gaborjbernat #42554: distutils.util.get_platform() depends on minor version for mac https://bugs.python.org/issue42554 opened by fxcoudert #42556: unittest.mock.patch() cannot properly mock methods https://bugs.python.org/issue42556 opened by CendioOssman #42557: Make asyncio.__main__ reusable, also adding a preamble feature https://bugs.python.org/issue42557 opened by lschoe #42558: waitpid/waitid race caused by change to Popen.send_signal in P https://bugs.python.org/issue42558 opened by oconnor663 #42559: random.getrandbits: Should it be explicit that it returns unsi https://bugs.python.org/issue42559 opened by pfalcon #42560: Improve Tkinter Documentation https://bugs.python.org/issue42560 opened by mason2 #42561: better error reporting in ast https://bugs.python.org/issue42561 opened by sam-s #42563: max function reports type errors in incorrect order https://bugs.python.org/issue42563 opened by nkobald #42564: "from .__init__ import ..." syntax imports a duplicate module https://bugs.python.org/issue42564 opened by indygreg #42565: Traceback (most recent call last): File "<stdin>", line 1, i https://bugs.python.org/issue42565 opened by sivakrishnaavvaru #42566: Clearing stack frame of suspended coroutine causes coroutine t https://bugs.python.org/issue42566 opened by zerotypic #42567: Enum: manually call __init_subclass__ after members are added https://bugs.python.org/issue42567 opened by ethan.furman #42569: Callers of _Py_fopen/_Py_wfopen may be broken after addition o https://bugs.python.org/issue42569 opened by izbyshev #42570: Try and Except doesn't work properly https://bugs.python.org/issue42570 opened by blue555 Most recent 15 issues with no replies (15) ========================================== #42567: Enum: manually call __init_subclass__ after members are added https://bugs.python.org/issue42567 #42566: Clearing stack frame of suspended coroutine causes coroutine t https://bugs.python.org/issue42566 #42561: better error reporting in ast https://bugs.python.org/issue42561 #42560: Improve Tkinter Documentation https://bugs.python.org/issue42560 #42557: Make asyncio.__main__ reusable, also adding a preamble feature https://bugs.python.org/issue42557 #42556: unittest.mock.patch() cannot properly mock methods https://bugs.python.org/issue42556 #42552: Automatically set parent thread idents on thread start https://bugs.python.org/issue42552 #42551: Generator `yield`s counted as primitive calls by cProfile https://bugs.python.org/issue42551 #42549: "quopri" line endings not standard conform https://bugs.python.org/issue42549 #42548: debugger stops at breakpoint of `pass` that is not actually re https://bugs.python.org/issue42548 #42544: In windows, asyncio.run_in_executor strips logger class inform https://bugs.python.org/issue42544 #42542: weakref documentation does not fully describe proxies https://bugs.python.org/issue42542 #42540: Debug pymalloc crash when using os.fork() [regression] https://bugs.python.org/issue42540 #42539: Missing parenthesis in `platform._sys_version_parser` https://bugs.python.org/issue42539 #42535: unittest.patch confuses modules with base modules https://bugs.python.org/issue42535 Most recent 15 issues waiting for review (15) ============================================= #42561: better error reporting in ast https://bugs.python.org/issue42561 #42547: argparse: add_argument(... nargs='+', metavar=<tuple>) does no https://bugs.python.org/issue42547 #42545: Check that all symbols in the limited ABI are exported https://bugs.python.org/issue42545 #42536: Iterating on a zip keeps objects alive longer than expected (t https://bugs.python.org/issue42536 #42532: spec_arg's __bool__ is called while initializing NonCallableMo https://bugs.python.org/issue42532 #42531: importlib.resources.path() raises TypeError for packages witho https://bugs.python.org/issue42531 #42528: Improve the docs of most Py*_Check{,Exact} API calls https://bugs.python.org/issue42528 #42524: pdb access to return value https://bugs.python.org/issue42524 #42519: [C API] Upgrade the C API in extension modules https://bugs.python.org/issue42519 #42513: Socket.recv hangs https://bugs.python.org/issue42513 #42508: macOS IDLE with Tk 8.6.10 in 3.9.1rc1 universal2 installer fai https://bugs.python.org/issue42508 #42504: Failure to build with MACOSX_DEPLOYMENT_TARGET=11 on Big Sur https://bugs.python.org/issue42504 #42482: TracebackException should not hold reference to the exception https://bugs.python.org/issue42482 #42476: Allow cross compiling python for macos-arm64 from macos-x86_64 https://bugs.python.org/issue42476 #42470: DeprecationWarning triggers for sequences which happen to be s https://bugs.python.org/issue42470 Top 10 most discussed issues (10) ================================= #42536: Iterating on a zip keeps objects alive longer than expected (t https://bugs.python.org/issue42536 35 msgs #42541: Tkinter colours wrong on MacOS universal2 https://bugs.python.org/issue42541 15 msgs #42507: test_ttk_guionly test failures on macOS with Tcl/Tk 8.6.10 https://bugs.python.org/issue42507 10 msgs #42504: Failure to build with MACOSX_DEPLOYMENT_TARGET=11 on Big Sur https://bugs.python.org/issue42504 8 msgs #42508: macOS IDLE with Tk 8.6.10 in 3.9.1rc1 universal2 installer fai https://bugs.python.org/issue42508 8 msgs #31904: Python should support VxWorks RTOS https://bugs.python.org/issue31904 7 msgs #32381: Python 3.6 cannot reopen .pyc file with non-ASCII path https://bugs.python.org/issue32381 7 msgs #42454: Move slice creation to the compiler for constants https://bugs.python.org/issue42454 7 msgs #39096: "Format Specification Mini-Language" doc mistake for Decimal https://bugs.python.org/issue39096 6 msgs #42455: Add decorator_factory function to functools module https://bugs.python.org/issue42455 6 msgs Issues closed (93) ================== #5773: Crash on shutdown after os.fdopen(2) in debug builds https://bugs.python.org/issue5773 closed by iritkatriel #10486: http.server doesn't set all CGI environment variables https://bugs.python.org/issue10486 closed by orsenthil #10837: Issue catching KeyboardInterrupt while reading stdin https://bugs.python.org/issue10837 closed by iritkatriel #11107: Cache constant "slice" instances https://bugs.python.org/issue11107 closed by terry.reedy #13341: Incorrect documentation for "u" PyArg_Parse format unit https://bugs.python.org/issue13341 closed by iritkatriel #14556: telnetlib Telnet.expect fails with timeout=0 https://bugs.python.org/issue14556 closed by iritkatriel #14869: imaplib erronously quotes atoms such as flags https://bugs.python.org/issue14869 closed by iritkatriel #15104: Unclear language in __main__ description https://bugs.python.org/issue15104 closed by iritkatriel #16027: pkgutil doesn't support frozen modules https://bugs.python.org/issue16027 closed by iritkatriel #17454: ld_so_aix not used when linking c++ (scipy) https://bugs.python.org/issue17454 closed by iritkatriel #18213: py-bt errors on backtrace with PyRun_SimpleString and friends https://bugs.python.org/issue18213 closed by iritkatriel #19478: Add ability to prefix posix semaphore names created by multipr https://bugs.python.org/issue19478 closed by iritkatriel #19570: distutils' Command.ensure_dirname fails on Unicode https://bugs.python.org/issue19570 closed by iritkatriel #21114: wsgiref.simple_server doesn't handle multi-line headers correc https://bugs.python.org/issue21114 closed by iritkatriel #21195: None float format: incomplete documentation https://bugs.python.org/issue21195 closed by iritkatriel #21664: multiprocessing leaks temporary directories pymp-xxx https://bugs.python.org/issue21664 closed by iritkatriel #22187: commands.mkarg() buggy in East Asian locales https://bugs.python.org/issue22187 closed by iritkatriel #22376: urllib2.urlopen().read().splitlines() opening a directory in a https://bugs.python.org/issue22376 closed by iritkatriel #22455: idna/punycode give wrong results on narrow builds https://bugs.python.org/issue22455 closed by iritkatriel #23805: _hashlib compile error? https://bugs.python.org/issue23805 closed by iritkatriel #24063: Support Mageia and Arch Linux in the platform module https://bugs.python.org/issue24063 closed by iritkatriel #24295: Backport of #17086 causes regression in setup.py https://bugs.python.org/issue24295 closed by iritkatriel #24429: msvcrt error when embedded https://bugs.python.org/issue24429 closed by iritkatriel #24506: make fails with gcc 4.9 due to fatal warning of unused variabl https://bugs.python.org/issue24506 closed by iritkatriel #24775: Python client failing to connect to server but completing as i https://bugs.python.org/issue24775 closed by iritkatriel #24923: Append system paths in setup.py instead of prepending https://bugs.python.org/issue24923 closed by iritkatriel #25635: urllib2 cannot fully read FTP file https://bugs.python.org/issue25635 closed by iritkatriel #25884: inspect.getmro() fails when base class lacks __bases__ attribu https://bugs.python.org/issue25884 closed by iritkatriel #26582: asyncio documentation links to wrong CancelledError https://bugs.python.org/issue26582 closed by asvetlov #27387: Thread hangs on str.encode() when locale is not set https://bugs.python.org/issue27387 closed by iritkatriel #28881: int no attribute 'lower' iterating email.Message https://bugs.python.org/issue28881 closed by iritkatriel #28931: urllib ignores FTP 226 response, breaking further FTP requests https://bugs.python.org/issue28931 closed by iritkatriel #31990: Pickling deadlocks in thread with python -m https://bugs.python.org/issue31990 closed by iritkatriel #33153: interpreter crash when multiplying large tuples https://bugs.python.org/issue33153 closed by iritkatriel #34079: Multiprocessing module fails to build on Solaris 11.3 https://bugs.python.org/issue34079 closed by iritkatriel #34215: streams.py:IncompleteReadError message is unclear when expecte https://bugs.python.org/issue34215 closed by asvetlov #34216: python platform no child error https://bugs.python.org/issue34216 closed by iritkatriel #34570: Segmentation fault in _PyType_Lookup https://bugs.python.org/issue34570 closed by iritkatriel #35120: SSH tunnel support to ftp lib https://bugs.python.org/issue35120 closed by iritkatriel #35534: SIGSEGV in stackdepth_walk https://bugs.python.org/issue35534 closed by iritkatriel #35953: crosscompilation fails with clang on android https://bugs.python.org/issue35953 closed by iritkatriel #38200: Adding itertools.pairwise to the standard library? https://bugs.python.org/issue38200 closed by rhettinger #38261: Tkinter CheckButton default label white in macOS dark mode https://bugs.python.org/issue38261 closed by ronaldoussoren #38283: sys._getframe(1).f_lineno changed behavior in 3.8 https://bugs.python.org/issue38283 closed by iritkatriel #38599: Deprecate creation of asyncio object when the loop is not runn https://bugs.python.org/issue38599 closed by asvetlov #40060: socket.TCP_NOTSENT_LOWAT is missing in official macOS builds https://bugs.python.org/issue40060 closed by ronaldoussoren #40800: asyncio.sleep(0) should "yield" back to the event loop, but it https://bugs.python.org/issue40800 closed by asvetlov #41241: Unnecessary Type casting in 'if condition' https://bugs.python.org/issue41241 closed by asvetlov #41896: Moving index with wordstart expression includes non-alphanumbe https://bugs.python.org/issue41896 closed by 23412343214312 #42324: Doctest: directives https://bugs.python.org/issue42324 closed by mdk #42406: Importing multiprocessing breaks pickle.whichmodule https://bugs.python.org/issue42406 closed by gregory.p.smith #42431: Fix outdated bytes comments https://bugs.python.org/issue42431 closed by serhiy.storchaka #42437: crypt produces wrong hashes for passwords containing dollar si https://bugs.python.org/issue42437 closed by eric.smith #42451: Indicate in the docs that PyTuple_GetItem does not support neg https://bugs.python.org/issue42451 closed by vstinner #42452: Improve colorsys.rgb_to_hls code https://bugs.python.org/issue42452 closed by terry.reedy #42466: asyncio loop.getaddrinfo raises RuntimeError https://bugs.python.org/issue42466 closed by asvetlov #42471: Slowdown in socket tests noticed since Py3.8 https://bugs.python.org/issue42471 closed by ronaldoussoren #42474: improve test coverage for TracebackException's __eq__ https://bugs.python.org/issue42474 closed by gvanrossum #42480: Python Tkinter crashes on macOS 11.1 beta https://bugs.python.org/issue42480 closed by ned.deily #42485: Full grammar specification should link to PEP 617 https://bugs.python.org/issue42485 closed by pablogsal #42486: Investigate docs.python.org egregious SEO performance on Googl https://bugs.python.org/issue42486 closed by vstinner #42487: collections.ChainMap.__iter__ calls __getitem__ on underlying https://bugs.python.org/issue42487 closed by rhettinger #42488: Mathematical error https://bugs.python.org/issue42488 closed by steven.daprano #42489: Wrong method signature in python Documentation https://bugs.python.org/issue42489 closed by asvetlov #42490: Business Logical Error https://bugs.python.org/issue42490 closed by steven.daprano #42493: pathlib.Path.__eq__ should test normalized path https://bugs.python.org/issue42493 closed by ascola #42494: struct.unpack_from return 2 values instead of one https://bugs.python.org/issue42494 closed by steven.daprano #42495: socket.gethostbyaddr raises error if invalid unicode in hosts https://bugs.python.org/issue42495 closed by steve.dower #42496: Don't change indentation of RST markup https://bugs.python.org/issue42496 closed by rhettinger #42497: New pathlib.Path attribute https://bugs.python.org/issue42497 closed by eryksun #42499: python not correctly processing double quotes in command line https://bugs.python.org/issue42499 closed by eryksun #42500: crash with unbounded recursion in except statement https://bugs.python.org/issue42500 closed by Mark.Shannon #42501: Improve error messages for argparse choices using enum https://bugs.python.org/issue42501 closed by rhettinger #42502: Conflict between get_traced_memory and setrlimit https://bugs.python.org/issue42502 closed by Vipul-Cariappa #42503: Cannot declare method or static function parameter or return t https://bugs.python.org/issue42503 closed by serhiy.storchaka #42505: MACOSX_DEPLOYMENT_TARGET should accept non-decimal (int) value https://bugs.python.org/issue42505 closed by guillochon #42506: Unexpected output when running test_format https://bugs.python.org/issue42506 closed by corona10 #42509: Recursive calls crash interpreter when checking exceptions https://bugs.python.org/issue42509 closed by Mark.Shannon #42510: Tuple Slice Bug https://bugs.python.org/issue42510 closed by serhiy.storchaka #42511: string in string not working https://bugs.python.org/issue42511 closed by vstinner #42515: Devguide recommend against using PRs to update fork https://bugs.python.org/issue42515 closed by Mariatta #42518: Error Message https://bugs.python.org/issue42518 closed by eric.smith #42521: Debug (-d) mode not working in 3.9 https://bugs.python.org/issue42521 closed by pablogsal #42522: [C API] Add _Py_Borrow() private function: call Py_XDECREF() a https://bugs.python.org/issue42522 closed by vstinner #42523: using windows doc incorrectly states version support https://bugs.python.org/issue42523 closed by steve.dower #42530: Pickle Serialization Mangles NllLossBackward Objects in Tensor https://bugs.python.org/issue42530 closed by serhiy.storchaka #42537: Implement built-in shorthand b() for breakpoint() https://bugs.python.org/issue42537 closed by nalzok #42546: copy - Allow dict.copy(deep=True) alongside copy.deepcopy() fo https://bugs.python.org/issue42546 closed by iritkatriel #42550: re库匹配问题 https://bugs.python.org/issue42550 closed by andy.ye.jx #42553: test_asyncio: test_call_later() fails on Windows x64 GitHub Ac https://bugs.python.org/issue42553 closed by vstinner #42555: math function sqrt() not working in 3.9 https://bugs.python.org/issue42555 closed by christian.heimes #42562: dis failed to parse function that has only annotations https://bugs.python.org/issue42562 closed by Mark.Shannon #42568: Python can't run .pyc files with non-ASCII path on Windows https://bugs.python.org/issue42568 closed by eryksun

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python.org doc portal question/bug
by Jonathan Goble Dec. 4, 2020

Dec. 4, 2020

On https://www.python.org/doc/ I notice that on the right side, under the heading "Porting from Python 2 to Python 3", there is one bullet point that is not linked to anywhere and just sits as plain text: "Determine what projects are blocking you from porting to Python 3". It seems like a weird place to have a bullet point of plain text that's quite a bit more specific than surrounding bullets. Is this line of text supposed to be on a different page? Is it supposed to be linked to another page that explains how to find which projects are blocking you? If the answer to both is no, why is it sitting somewhere where (to me, at least) it looks out of place, and what can be done to make it less jarring and less confusing?

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