Mailman 3 August 2021 - Python-Dev

PEP 558, the simplest thing I could come up with
by Mark Shannon Aug. 16, 2021

Aug. 16, 2021

Hi Nick, Our discussion on PEP 558 got me thinking "What is the simplest thing that would work?". This is what I came up (in the form of a draft PEP): https://github.com/markshannon/peps/blob/pep-locals/pep-06xx.rst It doesn't have O(1) len(f_locals), and it does break `PyEval_GetLocals()` but I think the that is a small price to pay for simplicity and consistency. What do you think? Cheers, Mark.

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Summary of Python tracker Issues
by Python tracker Aug. 13, 2021

Aug. 13, 2021

ACTIVITY SUMMARY (2021-08-06 - 2021-08-13) 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 7393 ( -4) closed 49249 (+60) total 56642 (+56) Open issues with patches: 2924 Issues opened (39) ================== #44855: [doc] Complete the sqlite3 exception documentation https://bugs.python.org/issue44855 opened by erlendaasland #44859: Improve some … [View More]

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PEP 649: Deferred Evaluation Of Annotations
by Eric V. Smith Aug. 12, 2021

Aug. 12, 2021

I'd like to revive the discussion of PEP 649 [https://www.python.org/dev/peps/pep-0649/] that started shortly before development of 3.10 features was closed. This is Larry's PEP to defer evaluation of __annotations__ until it's actually accessed. During the discussion the decision was made to back out the change that made "from __future__ import annotations" (PEP 563 [https://www.python.org/dev/peps/pep-0563/]) the default behavior for 3.10. My understanding is that PEP 649 is currently … [View More]

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May/June steering council updates.
by Thomas Wouters Aug. 12, 2021

Aug. 12, 2021

The Steering Council is a bit behind on the community updates, but we just published the May and June ones (also included below): https://github.com/python/steering-council/blob/main/updates/2021-05-steeri… https://github.com/python/steering-council/blob/main/updates/2021-06-steeri… Just as a reminder, if you have any questions or concerns, feel free to contact us or open an issue in the SC repo: https://github.com/python/steering-council May 3 - Steering Council used the weekly … [View More]meeting to record their PyCon US keynote <https://www.youtube.com/watch?v=xEkuOtCQ6vA> <https://github.com/python/steering-council/blob/27a07634ab171fbe0f2a15f83d6…>May 10 - The Core Developers voted to promote Irit Katriel to Core Dev, and the Steering Council has no objections. - SC scheduled a PEP review in two weeks. - SC discussed delegating typing PEPs, but did not reach a conclusion. - SC discussed PEP 563 <https://www.python.org/dev/peps/pep-0563> (Postponed Evaluation of Annotations), the unexpected effects of the change, the last-minute postponement, and how to prevent similar occurrences in the future. <https://github.com/python/steering-council/blob/27a07634ab171fbe0f2a15f83d6…>May 17 - Group discussed documenting SC history and procedures. Carol is going to start on it in the private repo and then it can pushed out to the public one. - Thomas is going to ask Nathaniel for a concrete counter proposal for PEP 654 <https://www.python.org/dev/peps/pep-0654/> (Exception Groups and except*). - Group discussed using Hypothesis in the standard library. <https://github.com/python/steering-council/blob/27a07634ab171fbe0f2a15f83d6…>May 24 - The Steering Council did PEP review and assigned pings to PEP authors and sponsors. - The Steering Council discussed who applied for the Developer-in-Residence position and Carol placed it on the agenda for June 7th. - The Steering Council will not be meeting next week due to Memorial Day in the US. June 7 - The Steering Council reviewed the résumés received for the Developer-in-Residence position. The candidates were selected for the interview process. The Steering Council prepared for Developer in Residence interviews by reviewing questions for the interviews. <https://github.com/python/steering-council/blob/27a07634ab171fbe0f2a15f83d6…>June 14 - Steering Council and PSF staff interviewed candidates for the Developer-in-Residence position, and discussed the interviews immediately afterwards. <https://github.com/python/steering-council/blob/27a07634ab171fbe0f2a15f83d6…>June 21 - The Steering Council extensively discussed the Developer-in-Residence candidates, and made their final selection. - The SC discussed improving workflows around full-time contributors. The group will continue to think and discuss this. <https://github.com/python/steering-council/blob/27a07634ab171fbe0f2a15f83d6…>June 28 - The Steering Council reviewed PEP 654 <https://www.python.org/dev/peps/pep-0654/> (Exception Groups and except*). Thomas will schedule a call with Nathaniel and the SC, possibly for next Monday (July 5), to hear Nathaniel's alternative proposal. - The SC reviewed PEP 467 <https://www.python.org/dev/peps/pep-0467/> (Minor API improvements for binary sequences) and there are concerns about the value of the change and the future implementation. Thomas was going to start a draft response, but didn't get around to it. - The SC reviewed PEP 657 <https://www.python.org/dev/peps/pep-0657/> (Include Fine Grained Error Locations in Tracebacks). The group approved it (Pablo abstained because he's one of the PEP's authors) and Barry sent the announcement <https://mail.python.org/archives/list/python-committers@python.org/thread/3…> to python-dev@. - Group discussed the request <https://github.com/python/steering-council/issues/68> around modules following a provisional policies. Group decided that Barry will reach out to the module author about importlib.metadata's provisional status. The group will continue their discussion on how to move forward with provisional modules/packages. - Group discussed enum.Enum repr and str changes in 3.10 & 3.11. It was decided that Barry will email python-dev@ and strongly suggest that we rollback to 3.9 behavior for 3.10 and write a new PEP for 3.11. -- Thomas Wouters <thomas(a)python.org> Hi! I'm an email virus! Think twice before sending your email to help me spread! [View Less]

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Should we try to get a complete draft of What's New by b1?
by Brett Cannon Aug. 12, 2021

Aug. 12, 2021

Not to specifically pick on Eric V. Smith, but yesterday a co-worker came to me asking about `KW_ONLY` for dataclasses and wanting to provide feedback ( https://docs.python.org/3.10/library/dataclasses.html#dataclasses.KW_ONLY). I said we had reached RC and so it was pretty much too late; the alphas and betas are when one should provide feedback. But then I realized you wouldn't even know about this new feature unless you read What's New ... and that's when I found out this new feature isn't … [View More]

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New __main__.rst
by Jack DeVries Aug. 10, 2021

Aug. 10, 2021

There have been a series of requests to enhance the current __main__.rst document <https://docs.python.org/3/library/__main__.html>: bpo-17359 <https://bugs.python.org/issue17359> bpo-24632 <https://bugs.python.org/issue24632> bpo-39452 <https://bugs.python.org/issue39452> So, I rewrote it! I went ahead and hosted it on my website for you all to easily take a look: https://jackdevries.com/pydoc__main__/library/__main__.html Of course, you can go directly to the … [View More]

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Windows buildbots may be broken
by Jason R. Coombs Aug. 9, 2021

Aug. 9, 2021

Jeremy informed me<https://github.com/python/cpython/pull/27436#issuecomment-889815333> that due to a race condition on a test file and the CPython repo configuration for newline conversion, build bots on Windows may now be failing. If you run such a buildbot, please consider running this command on your repo to bypass the issue: git rm -r :/ ; git checkout HEAD -- :/ You may want to consider adding this command after every update to the repo to avoid the stale state.

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Heads up: `make` in Doc now creates a venv
by Petr Viktorin Aug. 6, 2021

Aug. 6, 2021

Hi, A recent change "make html" in the Doc directory create a venv if one wasn't there before. If you don't want to download sphinx and other dependencies from PyPI, you'll need to adjust your workflow. If you already have all the dependencies, the following command (in the CPython directory, not Doc) will build docs for you: sphinx-build Doc Doc/build/ The issue that added this is: https://bugs.python.org/issue44756

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Re: PEP 646 (Variadic Generics): final call for comments
by Dan Moldovan Aug. 6, 2021

Aug. 6, 2021

I'd be interested in using this the mechanisms defined in this PEP to define rank-generic Tensor types in TensorFlow, which are important in specifying `tf.function` signatures in a Pythonic way, using type annotations (rather than the custom input_signature mechanism we have today - see this issue: https://github.com/tensorflow/tensorflow/issues/31579). Variadic generics are among the last few missing pieces to create an elegant set of type definitions for tensors and shapes. Best, Dan … [View More]

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Devguide document on PEG parser
by Pablo Galindo Salgado Aug. 5, 2021

Aug. 5, 2021

Hi, After some effort, I just finished a new extensive document in the devguide regarding how to use the new PEG parser and the PEG grammar: https://devguide.python.org/parser/ The document contains descriptions, backgrounds, references, guides, and tips. Ideally, this will make it a bit easier for everyone that wants to deal with the grammar or the parser. Hope that you find it useful :) P.S. Thanks to everyone that helped with the review! Regards from cloudy London, Pablo Galindo Salgado

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