Mailman 3 May 2018 - Python-Dev

Re: [Python-Dev] PEP 575 (Unifying function/method classes) update
by Jeroen Demeyer 15 May '18

15 May '18

On 2018-05-14 22:38, Petr Viktorin wrote: > Why are these flags added? > They aren't free – the space of available flags is not infinite. If > something (Cython?) needs eight of them, it would be nice to mention the > use case, at least as an example. > > What should Python do with a m_methods entry that has METH_CUSTOM set? > Again it would be nice to have an example or use case. They have no specific use case. I just added this because it made sense abstractly. I can remove this from my PEP to simplify it.

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PEP 575 (Unifying function/method classes) update
by Jeroen Demeyer 15 May '18

15 May '18

Hello all, I have updated PEP 575 in response to some posts on this mailing list and to some discussions in person with the core Cython developers. See https://www.python.org/dev/peps/pep-0575/ The main differences with respect to the previous version are: * "builtin_function" was renamed to "cfunction". Since we are changing the name anyway, "cfunction" looked like a better choice because the word "built-in" typically refers to things from the builtins module. * defined_function now only defines an API (it must support all attributes that a Python function has) without specifying the implementation. * The "Two-phase Implementation" proposal for better backwards compatibility has been expanded and now offers 100% backwards compatibility for the classes and for the inspect functions. Jeroen.

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bpo-33257: seeking advice & approval on the course of action
by Ivan Pozdeev 15 May '18

15 May '18

The bottom line is: Tkinter is currently broken -- as in, it's not thread-safe (in both Py2 and Py3) despite being designed and advertizing itself as such. All the fix options require some redesign of either `_tkinter', or some of the core as well. So, I'd like to get some kind of core team's feedback and/or approval before pursuing any of them. The options are outlined in https://bugs.python.org/issue33257#msg316087 . If anyone of you is in Moscow, we can meet up and discuss this in a more time-efficient manner. -- Regards, Ivan

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Re: [Python-Dev] bpo-28055: Fix unaligned accesses in siphash24(). (GH-6123)
by Christian Heimes 14 May '18

14 May '18

On 2018-05-13 06:57, Serhiy Storchaka wrote: > https://github.com/python/cpython/commit/1e2ec8a996daec65d8d5a3d43b66a9909c… > commit: 1e2ec8a996daec65d8d5a3d43b66a9909c6d0653 > branch: master > author: Rolf Eike Beer <eike(a)sf-mail.de> > committer: Serhiy Storchaka <storchaka(a)gmail.com> > date: 2018-05-13T13:57:31+03:00 > summary: > > bpo-28055: Fix unaligned accesses in siphash24(). (GH-6123) > > The hash implementation casts the input pointer to uint64_t* and directly reads > from this, which may cause unaligned accesses. Use memcpy() instead so this code > will not crash with SIGBUS on sparc. > > https://bugs.gentoo.org/show_bug.cgi?id=636400 > > files: > A Misc/NEWS.d/next/Core and Builtins/2018-04-25-20-44-42.bpo-28055.f49kfC.rst > M Python/pyhash.c Hi Serhiy, I was against the approach a good reason. The PR adds additional CPU instructions and changes memory access pattern in a critical path of CPython. There is no reason to add additional overhead for the majority of users or X86 and X86_64 architectures. The memcpy() call should only be used on architectures that do not support unaligned memory access. See comment https://bugs.python.org/issue28055#msg276257 At least for latest GCC, the change seems to be fine. GCC emits the same assembly code for X86_64 before and after your change. Did you check the output on other CPU architectures as well as clang and MSVC, too? Christian

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Bugs Migration to OpenShift
by Mark Mangoba 13 May '18

13 May '18

Hi All, We’re planning to finish up the bugs.python.org migration to Red Hat OpenShift by May 14th (US Pycon Sprints). For the most part everything will stay same, with the exception of cleaning up some old URL’s and redirects from the previous hosting provider: Upfront Software. We will post a more concrete timeline here by May 1st, but wanted to share this exciting news to move bugs.python.org into a more stable and optimal state. Thank you all for your patience and feedback. A special thanks to Maciej Szulik and Red Hat for helping the PSF with this project. Best regards, Mark -- Mark Mangoba | PSF IT Manager | Python Software Foundation | mmangoba(a)python.org | python.org | Infrastructure Staff: infrastructure-staff(a)python.org | GPG: 2DE4 D92B 739C 649B EBB8 CCF6 DC05 E024 5F4C A0D1

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PEP 554 - strange random boldface
by Steve Holden 13 May '18

13 May '18

Does anyone know why some lines in the tables of https://www.python.org/dev/peps/pep-0554/ appear in bold when the markup doesn't seem to call for it? I can't find a way to stop this, and it's bugging me! regards Steve

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PEP 572 and f-strings
by Eric V. Smith 12 May '18

12 May '18

I don't think it matters to its acceptance, but PEP 572 should at least mention that the := syntax means that you cannot use assignment expressions in f-strings. As I wrote in a python-ideas email, f'{x:=4}' already has a defined meaning (even if no one is using it). Eric

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Summary of Python tracker Issues
by Python tracker 11 May '18

11 May '18

ACTIVITY SUMMARY (2018-05-04 - 2018-05-11) 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 6644 (+15) closed 38571 (+24) total 45215 (+39) Open issues with patches: 2604 Issues opened (34) ================== #14384: Add "default" kw argument to operator.itemgetter and operator. https://bugs.python.org/issue14384 reopened by gvanrossum #33426: Behavior of os.path.join does not match documentation https://bugs.python.org/issue33426 opened by Michael Klatt #33427: Dead link in "The Python Standard Library" page https://bugs.python.org/issue33427 opened by lighthawk #33428: pathlib.Path.glob does not follow symlinks https://bugs.python.org/issue33428 opened by brianmsheldon #33430: Import secrets module in secrets examples https://bugs.python.org/issue33430 opened by dchimeno #33431: Change description about doc in programming, faq. https://bugs.python.org/issue33431 opened by lvhuiyang #33433: ipaddress is_private misleading for IPv4 mapped IPv6 addresses https://bugs.python.org/issue33433 opened by Thomas Kriechbaumer #33435: incorrect detection of information of some distributions https://bugs.python.org/issue33435 opened by mrandybu #33436: Add an interactive shell for Sqlite3 https://bugs.python.org/issue33436 opened by rhettinger #33437: Defining __init__ in enums https://bugs.python.org/issue33437 opened by killerrex #33438: pkg-config file misses flags for static linking https://bugs.python.org/issue33438 opened by pitrou #33439: python-config.py should be part of the stdlib https://bugs.python.org/issue33439 opened by pitrou #33440: Possible lazy import opportunities in `pathlib` https://bugs.python.org/issue33440 opened by ncoghlan #33441: Expose the sigset_t converter via private API https://bugs.python.org/issue33441 opened by serhiy.storchaka #33442: Python 3 doc sidebar dosnt follow page scrolling like 2.7 doc https://bugs.python.org/issue33442 opened by pete312 #33443: Typo in Python/import.c https://bugs.python.org/issue33443 opened by ukwksk #33446: destructors of local variables are not traced https://bugs.python.org/issue33446 opened by xdegaye #33447: Asynchronous lambda syntax https://bugs.python.org/issue33447 opened by Noah Simon #33448: Output_Typo_Error https://bugs.python.org/issue33448 opened by vishva_11 #33449: Documentation for email.charset confusing about the location o https://bugs.python.org/issue33449 opened by Francois Labelle #33450: unexpected EPROTOTYPE returned by sendto on MAC OSX https://bugs.python.org/issue33450 opened by racitup #33451: Start pyc file lock the file https://bugs.python.org/issue33451 opened by Jean-Louis Tamburini #33452: add user notification that parent init will not be called in d https://bugs.python.org/issue33452 opened by Ricyteach #33453: from __future__ import annotations breaks dataclasses ClassVar https://bugs.python.org/issue33453 opened by Ricyteach #33454: Mismatched C function signature in _xxsubinterpreters.channel_ https://bugs.python.org/issue33454 opened by serhiy.storchaka #33456: site.py: by default, a virtual environment is *not* isolated f https://bugs.python.org/issue33456 opened by meribold #33457: python-config ldflags, PEP 513 and explicit linking to libpyth https://bugs.python.org/issue33457 opened by dimi #33458: pdb.run() does not trace destructors of __main__ https://bugs.python.org/issue33458 opened by xdegaye #33459: Define "tuple display" in the docs https://bugs.python.org/issue33459 opened by adelfino #33460: ... used to indicate many different things in chapter 3, some https://bugs.python.org/issue33460 opened by lew18 #33461: json.loads(encoding=<not None>) does not emit deprecation warn https://bugs.python.org/issue33461 opened by mbussonn #33462: reversible dict https://bugs.python.org/issue33462 opened by selik #33463: Can namedtuple._asdict return a regular dict instead of Ordere https://bugs.python.org/issue33463 opened by selik #33464: AIX and "specialized downloads" links https://bugs.python.org/issue33464 opened by Michael.Felt Most recent 15 issues with no replies (15) ========================================== #33462: reversible dict https://bugs.python.org/issue33462 #33460: ... used to indicate many different things in chapter 3, some https://bugs.python.org/issue33460 #33457: python-config ldflags, PEP 513 and explicit linking to libpyth https://bugs.python.org/issue33457 #33456: site.py: by default, a virtual environment is *not* isolated f https://bugs.python.org/issue33456 #33454: Mismatched C function signature in _xxsubinterpreters.channel_ https://bugs.python.org/issue33454 #33451: Start pyc file lock the file https://bugs.python.org/issue33451 #33443: Typo in Python/import.c https://bugs.python.org/issue33443 #33442: Python 3 doc sidebar dosnt follow page scrolling like 2.7 doc https://bugs.python.org/issue33442 #33439: python-config.py should be part of the stdlib https://bugs.python.org/issue33439 #33435: incorrect detection of information of some distributions https://bugs.python.org/issue33435 #33433: ipaddress is_private misleading for IPv4 mapped IPv6 addresses https://bugs.python.org/issue33433 #33431: Change description about doc in programming, faq. https://bugs.python.org/issue33431 #33428: pathlib.Path.glob does not follow symlinks https://bugs.python.org/issue33428 #33421: Missing documentation for typing.AsyncContextManager https://bugs.python.org/issue33421 #33418: Memory leaks in functions https://bugs.python.org/issue33418 Most recent 15 issues waiting for review (15) ============================================= #33461: json.loads(encoding=<not None>) does not emit deprecation warn https://bugs.python.org/issue33461 #33459: Define "tuple display" in the docs https://bugs.python.org/issue33459 #33456: site.py: by default, a virtual environment is *not* isolated f https://bugs.python.org/issue33456 #33454: Mismatched C function signature in _xxsubinterpreters.channel_ https://bugs.python.org/issue33454 #33446: destructors of local variables are not traced https://bugs.python.org/issue33446 #33443: Typo in Python/import.c https://bugs.python.org/issue33443 #33441: Expose the sigset_t converter via private API https://bugs.python.org/issue33441 #33437: Defining __init__ in enums https://bugs.python.org/issue33437 #33435: incorrect detection of information of some distributions https://bugs.python.org/issue33435 #33431: Change description about doc in programming, faq. https://bugs.python.org/issue33431 #33430: Import secrets module in secrets examples https://bugs.python.org/issue33430 #33427: Dead link in "The Python Standard Library" page https://bugs.python.org/issue33427 #33421: Missing documentation for typing.AsyncContextManager https://bugs.python.org/issue33421 #33413: asyncio.gather should not use special Future https://bugs.python.org/issue33413 #33403: asyncio.tasks.wait does not allow to set custom exception when https://bugs.python.org/issue33403 Top 10 most discussed issues (10) ================================= #33453: from __future__ import annotations breaks dataclasses ClassVar https://bugs.python.org/issue33453 12 msgs #20087: Mismatch between glibc and X11 locale.alias https://bugs.python.org/issue20087 7 msgs #20104: expose posix_spawn(p) https://bugs.python.org/issue20104 6 msgs #33012: Invalid function cast warnings with gcc 8 for METH_NOARGS https://bugs.python.org/issue33012 4 msgs #33355: Windows 10 buildbot: 15 min timeout on test_mmap.test_large_fi https://bugs.python.org/issue33355 4 msgs #33389: argparse redundant help string https://bugs.python.org/issue33389 4 msgs #3692: improper scope in list comprehension, when used in class decla https://bugs.python.org/issue3692 3 msgs #13044: pdb throws AttributeError at end of debugging session https://bugs.python.org/issue13044 3 msgs #14384: Add "default" kw argument to operator.itemgetter and operator. https://bugs.python.org/issue14384 3 msgs #21983: segfault in ctypes.cast https://bugs.python.org/issue21983 3 msgs Issues closed (23) ================== #13525: Tutorial: Example of Source Code Encoding triggers error https://bugs.python.org/issue13525 closed by serhiy.storchaka #16653: reference kept in f_locals prevents the tracing/profiling of a https://bugs.python.org/issue16653 closed by xdegaye #25109: test_code_module tests fail when run from the installed locati https://bugs.python.org/issue25109 closed by doko #32189: SyntaxError for yield expressions inside comprehensions & gene https://bugs.python.org/issue32189 closed by serhiy.storchaka #32362: multiprocessing.connection.Connection misdocumented as multipr https://bugs.python.org/issue32362 closed by serhiy.storchaka #32626: Subscript unpacking raises SyntaxError https://bugs.python.org/issue32626 closed by serhiy.storchaka #32717: Document PEP 560 https://bugs.python.org/issue32717 closed by levkivskyi #32857: tkinter after_cancel does not behave correctly when called wit https://bugs.python.org/issue32857 closed by serhiy.storchaka #33038: GzipFile doesn't always ignore None as filename https://bugs.python.org/issue33038 closed by serhiy.storchaka #33296: datetime.datetime.utcfromtimestamp call decimal causes precisi https://bugs.python.org/issue33296 closed by serhiy.storchaka #33311: cgitb: remove parentheses when the error is in module https://bugs.python.org/issue33311 closed by serhiy.storchaka #33392: pathlib .glob('*/') returns files as well as directories https://bugs.python.org/issue33392 closed by SilentGhost #33414: Make shutil.copytree use os.scandir to take advantage of cache https://bugs.python.org/issue33414 closed by serhiy.storchaka #33417: Isinstance() behavior is not consistent with the document https://bugs.python.org/issue33417 closed by terry.reedy #33419: Add functools.partialclass https://bugs.python.org/issue33419 closed by ncoghlan #33420: [typing] __origin__ invariant broken https://bugs.python.org/issue33420 closed by levkivskyi #33422: Fix and update string/byte literals in help() https://bugs.python.org/issue33422 closed by serhiy.storchaka #33429: IDLE tooltips stopped working between 2.7.14 and 2.7.15 on Mac https://bugs.python.org/issue33429 closed by ned.deily #33432: No locale alias mapping key for en_IL https://bugs.python.org/issue33432 closed by serhiy.storchaka #33434: ^L character in Lib/email/generator.py https://bugs.python.org/issue33434 closed by serhiy.storchaka #33444: Memory leak/high usage on copy in different thread https://bugs.python.org/issue33444 closed by pitrou #33445: test_cprofile should fail instead of displaying a message https://bugs.python.org/issue33445 closed by benjamin.peterson #33455: test.test_posix.TestPosixSpawn::test_specify_environment fails https://bugs.python.org/issue33455 closed by serhiy.storchaka

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Associated images in PEPs broken?
by Chris Angelico 11 May '18

11 May '18

https://www.python.org/dev/peps/pep-0495/ All the images seem to be missing - showing up 404. They're in the peps repository, but aren't showing up in the page. Who's in charge of the HTML rendering there? Infrastructure? ChrisA

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Re: [Python-Dev] PEP 575 (Unifying function/method classes) update
by Jeroen Demeyer 10 May '18

10 May '18

On 2018-05-06 09:35, Nick Coghlan wrote: > Thanks for this update Jeroen! If it doesn't come up otherwise, I'll try > to claim one of the lightning talk slots at the Language Summit to > discuss this with folks in person :) Sounds great! I'd love to hear what people think. As an example of how the new functionality of PEP 575 can be used, I changed functools.lru_cache to implement the _lru_cache_wrapper class as subclass of base_function. I added this to the reference implementation https://github.com/jdemeyer/cpython/tree/pep575

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