Mailman 3 March 2021 - Python-Dev

Merge Request Review Reminder
by Faisal Mahmood March 23, 2021

March 23, 2021

Hello, I hope you are all well, I currently have an issue / merge request that has become stale and as per the guidelines I am sending this e-mail to request someone to review it for me please. Issue Number: 42861 (https://bugs.python.org/issue42861) Pull Request: 24180 (https://github.com/python/cpython/pull/24180) This is my first contribution to CPython and I am very keen to get this added as I think it is an almost essential enhancement missing from the ipaddress module. I would greatly … [View More]

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Python Language Summit 2021 Signups Are Now Open
by Łukasz Langa March 22, 2021

March 22, 2021

I’m happy to announce that we’ve opened the sign-up forms for the 2021 Python Language Summit! TL;DR When: Tuesday, May 11, 2021 (4 hours) and Wednesday, May 12, 2021 (4 hours). Exact times TBD depending on attendee timezones. Where: Online via Zoom (link will be sent via email to attendees) Co-chairs: Mariatta Wijaya & Łukasz Langa Blogger: Joanna Jablonski Sign up to attend and actively participate: https://forms.gle/cgmGnmQMDhD2mhHY8 <https://forms.gle/cgmGnmQMDhD2mhHY8> (closes … [View More]after March 22nd, 2021 AoE) Propose a topic: https://forms.gle/Jui9mxsHrB4fVvAB8 <https://forms.gle/Jui9mxsHrB4fVvAB8> (closes after March 22nd, 2021 AoE) To get an idea of past Python Language Summits, you can read these blog posts: 2020: Python Software Foundation News: The 2020 Python Language Summit <https://pyfound.blogspot.com/2020/04/the-2020-python-language-summit.html> 2019: http://pyfound.blogspot.com/2019/05/the-2019-python-language-summit.html <http://pyfound.blogspot.com/2019/05/the-2019-python-language-summit.html> 2018: The 2018 Python Language Summit [LWN.net] <https://lwn.net/Articles/754152/> 2017: The 2017 Python Language Summit [LWN.net] <https://lwn.net/Articles/723251/> Do I need to sign up if I’m a Python core developer? Yes please! While in the past we have limited attendance to 50 people, this time, due to virtual format, we will be a bit more flexible, but will still keep it small and manageable. We aren’t planning to go beyond 80 participants. Please register to reserve your space. Can I sign up if I’m not a Python core developer? Yes you can. In the past, we had quite a number of participants who were not Python core devs. Among them were maintainers and representatives from BeeWare, CircuitPython, PSF board member, PyCharm, PyPA, etc. Register if you want to participate. Note that until you hear back from us, your attendance is not confirmed. As explained in the question above, our “space” is more flexible than usual, but in the interest of maintaining a vigorous discussion space, we might still be unable to invite everyone who signs up. What kind of topics are covered? Python Language Summit is a special event with very specific audience: Python core developers. Ideally your topic is not an “announcement” or “project status” but rather something that will encourage further discussion and questions. The more controversial, the better. An open issue, group of issues, or a PEP that is awaiting decision are all good topics to propose. You can also further explain why this is better discussed in person instead of online. According to last year’s feedback, our audience prefer more discussions and shorter talks. Who can present a talk? Anyone, even if you’re not a Python core developer. However, please understand that we will have to be selective as space and time are limited. In particular, we are prioritizing active core contributors, as well as those who we believe will be able to improve the quality of the discussions at the event and bring a more diverse perspective to core Python developers. Note that your topic is not confirmed until you hear back from us. Code of Conduct PyCon’s Code of Conduct <https://us.pycon.org/2020/about/code-of-conduct/> applies and will be enforced. Thanks! @mariatta <https://discuss.python.org/u/mariatta> & @ambv <https://discuss.python.org/u/ambv> [View Less]

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Fwd: Re: aiter/anext review request
by Joshua Bronson March 22, 2021

March 22, 2021

On Sat, Mar 20, 2021 at 8:03 PM Guido van Rossum <guido(a)python.org> wrote: > The operator module is also C. > (In my 2018 PR, I was able to add the Python implementations of `aiter` and `anext` to Lib/operator.py, right above where it does "from _operator import *" toward the bottom of the file. I interpreted this pattern there to mean "shadow Python implementations with C implementations where available, but otherwise it's okay to use the Python implementations above". Is that … [View More]

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Buildbot UI auto-refreshes
by Antoine Pitrou March 21, 2021

March 21, 2021

Hello, It seems the buildbot Web UI has the bad habit of auto-refreshing itself (by doing a full page reload) every minute or two. I also couldn't find a setting to disable it (despite being logged in). Am I missing something? Regards Antoine.

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aiter/anext review request
by Joshua Bronson March 21, 2021

March 21, 2021

Dear python-dev, New here (but not to Python). 👋 Brett Cannon recommended I start a thread here (thanks, Brett!). In December, two colleagues and I submitted https://github.com/python/cpython/pull/23847, "Add aiter and anext to builtins", which would fix https://bugs.python.org/issue31861. Would any core developers who may be reading this be willing and able to provide a code review? We would love to try to address any review feedback before having to fix (another round of) merge conflicts.… [View More]

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Re: aiter/anext review request
by Daniel Pope March 21, 2021

March 21, 2021

As someone who was involved in implementing these, I think they should not be in builtins if that means they have to be in C. My argument is from a point of maintainability. Writing them was plenty of effort in the first place; Josh had written them in idiomatic async Python in the first place, my contribution was to unroll that to sync Python code, and then port that to (sync) C code. It was a lot of effort and a lot of code - several hundred lines and 4(?) new types. The Python code was a … [View More]

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pth file encoding
by Inada Naoki March 20, 2021

March 20, 2021

Hi, all. I found .pth file is decoded by the default (i.e. locale-specific) encoding. https://github.com/python/cpython/blob/0269ce87c9347542c54a653dd78b9f60bb9f… pth files contain: * import statements * paths For import statement, UTF-8 is the default Python code encoding. For paths, fsencoding is the right encoding. It is UTF-8 on Windows (excpet PYTHONLEGACYWINDOWSFSENCODING is set), and locale-specific encoding in Linux. What encoding should we use? * UTF-8 * sys.getfilesystemencoding(… [View More]

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Summary of Python tracker Issues
by Python tracker March 19, 2021

March 19, 2021

ACTIVITY SUMMARY (2021-03-12 - 2021-03-19) 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 7481 ( +3) closed 47813 (+75) total 55294 (+78) Open issues with patches: 2980 Issues opened (66) ================== #35943: PyImport_GetModule() can return partially-initialized module https://bugs.python.org/issue35943 reopened by pitrou #37788: fix for … [View More]

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PEP 654 -- Exception Groups and except* : request for feedback for SC submission
by Irit Katriel March 18, 2021

March 18, 2021

Hi all, We would like to request feedback on PEP 654 -- Exception Groups and except*. https://www.python.org/dev/peps/pep-0654/ It proposes language extensions that allow programs to raise and handle multiple unrelated exceptions simultaneously, motivated by the needs of asyncio and other concurrency libraries, but with other use cases as well. * A new standard exception type, ExceptionGroup, to represent multiple exceptions with shared traceback. * Updates to the traceback printing code … [View More]

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Non-monotonically increasing line numbers in dis.findlinestarts() output
by Skip Montanaro March 18, 2021

March 18, 2021

Consider this little session from the tip of the spear: >>> sys.version '3.10.0a6+ (heads/master:0ab152c6b5, Mar 15 2021, 17:24:38) [GCC 10.2.0]' >>> def while2(a): ... while a >= 0: ... a -= 1 ... return a ... >>> dis.dis(while2) 2 0 LOAD_FAST 0 (a) 2 LOAD_CONST 1 (0) 4 COMPARE_OP 5 (>=) 6 POP_JUMP_IF_FALSE 24 3 >> 8 LOAD_FAST … [View More]

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