Mailman 3 May 2022 - python-committers

Proposed tiered platform support
by Brett Cannon June 10, 2022

June 10, 2022

I brought this up on python-dev at https://mail.python.org/archives/list/python-dev@python.org/thread/ZPBSHENP… , and the feedback seemed supportive. As such, I am bringing a draft of what I'm thinking will go into PEP 11 with a bunch of `XXX` placeholders for people to help me fill in to see how this will look overall. For any platform(s) you support, please reply with any relevant details that should be added to the relevant tables below. Once I have these details I will loop back with the proposed update to PEP 11 and make sure everyone is still on board with the proposal. ===== Tiers ===== Tier 1 ====== - `Test suite failures < https://github.com/python/cpython/actions/workflows/build.yml?query=branch%…>`__ block releases. - Changes which would break the ``main`` branch are not allowed to be merged; any breakage may be reverted immediately. - All core developers are responsible to keep these platforms working. - Promotion of this tier requires consensus/SC approval. =================== ===== Target Triple Notes =================== ===== i686-windows-msvc x86_64-windows-msvc x86_64-apple-darwin macOS 11 x86_64-linux-gnu glibc 2.31 |ubuntu-20_01|_ =================== ===== .. [ubuntu-20_01] https://launchpad.net/ubuntu/+source/glibc/2.31-0ubuntu9.4 Tier 2 ====== - Must have a stable buildbot. - At least **two** core developers are signed up to support the platform. - Changes which break any of these platforms are to be reverted within 24 hours. - Failures of these platforms block a release. - Promotion of this tier requires consensus/SC approval. ====================== ========================== ============================================== ======== Target Triple Notes Buildbot Contacts ====================== ========================== ============================================== ======== aarch64-apple-darwin XXX https://buildbot.python.org/all/#/builders/725 XXX aarch64-linux-gnu glibc XXX [fedora-stable]_ https://buildbot.python.org/all/#/builders/125 XXX glibc 2.28 [RHEL8]_ https://buildbot.python.org/all/#/builders/529 XXX aarch64-windows-msvc XXX https://buildbot.python.org/all/#/builders/729 XXX powerpc64-linux-gnu glibc XXX https://buildbot.python.org/all/#/builders/237 XXX powerpcle-linux-gnu glibc XXX https://buildbot.python.org/all/#/builders/90 XXX s309x-linux-gnu glibc XXX https://buildbot.python.org/all/#/builders/223 XXX glibc 2.28 [RHEL8]_ https://buildbot.python.org/all/#/builders/509 XXX glibc 2.17 [RHEL7]_ https://buildbot.python.org/all/#/builders/179 XXX x86_64-linux-gnu glibc 2.17 [RHEL7]_ https://buildbot.python.org/all/#/builders/15 XXX x86_64-unknown-freebsd XXX https://buildbot.python.org/all/#/builders/172 XXX ====================== ========================== ============================================== ======== .. [fedora-stable] XXX .. [RHEL8] https://en.wikipedia.org/wiki/Red_Hat_Enterprise_Linux#RHEL_8 .. [RHEL7] https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/ht… Tier 3 ====== - Must have a stable buildbot. - Code may be checked into ``main`` for the platform. - At least **one** core developer is signed up to support the platform. - Test failures do **not** block releases. - Promotion to this tier is self-service. ========================= ========================== ============================================== ======== Target Triple Notes Buildbot Contacts ========================= ========================== ============================================== ======== wasm32-unknown-emscripten XXX XXX Brett Cannon, Christian Heimes wasm32-unknown-wasi XXX XXX Brett Cannon, Christian Heimes ========================= ========================== ============================================== ======== All other platforms =================== - Only code which either supports a higher-tier platform or is a general improvement may be checked in.

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Invitation to discuss TypeVar syntax
by Jelle Zijlstra June 1, 2022

June 1, 2022

Hi everyone, the typing community is considering a proposal to add new syntax to support generic types. This is likely to be a big change, so we'd love for any interested core developers to join the discussion early on so we can get alignment faster. We'll have a video call next Wednesday to discuss the proposal; any core devs (or other interested readers) are welcome to join. (Even if your opinion is "we shouldn't ever do this"—that would be important feedback.) The proposal is still in its early stages, but it would look something like: class list[T]: def append(self, obj: T, /) -> None: ... def __getitem__(self, i: int, /) -> T: ... Replacing the current syntax: from typing import Generic, TypeVar T = TypeVar("T") class list(Generic[T]): def append(self, obj: T, /) -> None: ... def __getitem__(self, i: int, /) -> T: ... This is just by way of introduction; I don't want to start a discussion on this list. If you do want to contribute to the discussion but can't join the meeting, please reply to the mailing list thread https://mail.python.org/archives/list/typing-sig@python.org/thread/GPQO2F4N… . ---------- Forwarded message --------- De: S Pradeep Kumar <gohanpra(a)gmail.com> Date: mar, 24 may 2022 a las 18:22 Subject: [Typing-sig] Re: Typing Meetup To: Cc: None via Typing-sig <typing-sig(a)python.org> *Update*: I'm moving the meetup to* Wednesday, June 1, 11:00 am San Francisco time (UTC-7)* / 7:00 pm London time (UTC+1). (The main reason for the change is that I want to invite some core dev folks outside of typing-sig, since we'll be discussing a syntax change. I don't want a repeat of Callable syntax :| ) *Agenda*: Syntax for TypeVars, by Sebastian Rittau Zoom link: https://us02web.zoom.us/j/84291194582. The meeting will be automatically recorded from the time it starts. I'll share the recording and notes after the meetup. [1] -- S Pradeep Kumar [1]: Meeting recording and notes: https://docs.google.com/document/d/17iqV7WWvB0IwA43EPlIqlUS6Xuvk08X3sEudAA-… _______________________________________________ Typing-sig mailing list -- typing-sig(a)python.org To unsubscribe send an email to typing-sig-leave(a)python.org https://mail.python.org/mailman3/lists/typing-sig.python.org/ Member address: jelle.zijlstra(a)gmail.com

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[RELEASE] The second Python 3.11 beta (3.11.0b2) is available
by Pablo Galindo Salgado May 31, 2022

May 31, 2022

Does anyone want bug fixes? Because we have 164 new commits fixing different things, from code to documentation. If you have reported some issue after 3.11.0b1, you should check if is fixed and if not, make sure you tell us so we can take a look. We still have two more betas to go so help us to make sure we don't miss anything so everything is ready for the final release!! https://www.python.org/downloads/release/python-3110b2/ ## This is a beta preview of Python 3.11 Python 3.11 is still in development. 3.11.0b2 is the second of four planned beta release previews. Beta release previews are intended to give the wider community the opportunity to test new features and bug fixes and to prepare their projects to support the new feature release. We **strongly encourage** maintainers of third-party Python projects to **test with 3.11** during the beta phase and report issues found to [the Python bug tracker](https://github.com/python/cpython/issues) as soon as possible. While the release is planned to be feature complete entering the beta phase, it is possible that features may be modified or, in rare cases, deleted up until the start of the release candidate phase (Monday, 2021-08-02). Our goal is to have no ABI changes after beta 4 and as few code changes as possible after 3.11.0rc1, the first release candidate. To achieve that, it will be **extremely important** to get as much exposure for 3.11 as possible during the beta phase. Please keep in mind that this is a preview release and its use is **not** recommended for production environments. # Major new features of the 3.11 series, compared to 3.10 Many new features for Python 3.11 are still being planned and written. Among the new major new features and changes so far: * [PEP 657](https://www.python.org/dev/peps/pep-0657/) -- Include Fine-Grained Error Locations in Tracebacks * [PEP 654](https://www.python.org/dev/peps/pep-0654/) -- Exception Groups and except* * [PEP 673](https://www.python.org/dev/peps/pep-0673/) -- Self Type * [PEP 646](https://www.python.org/dev/peps/pep-0646/)-- Variadic Generics * [PEP 680](https://www.python.org/dev/peps/pep-0680/)-- tomllib: Support for Parsing TOML in the Standard Library * [PEP 675](https://www.python.org/dev/peps/pep-0675/)-- Arbitrary Literal String Type * [PEP 655](https://www.python.org/dev/peps/pep-0655/)-- Marking individual TypedDict items as required or potentially-missing * [PEP 681](https://www.python.org/dev/peps/pep-0681/)-- Data Class Transforms * [bpo-46752](https://bugs.python.org/issue46752)-- Introduce task groups to asyncio * [bpo-433030](https://github.com/python/cpython/issues/34627/) -- Atomic grouping ((?>...)) and possessive quantifiers (`*+, ++, ?+, {m,n}+`) are now supported in regular expressions. * The [Faster Cpython Project](https://github.com/faster-cpython/) is already yielding some exciting results. Python 3.11 is up to 10-60% faster than Python 3.10. On average, we measured a 1.22x speedup on the standard benchmark suite. See [Faster CPython]( https://docs.python.org/3.11/whatsnew/3.11.html#faster-cpython) for details. * <small>(Hey, **fellow core developer,** if a feature you find important is missing from this list, [let Pablo know](mailto:pablogsal@python.org ).)</small> The next pre-release of Python 3.11 will be 3.11.0b3, currently scheduled for Thursday, 2022-06-16. # More resources * [Online Documentation](https://docs.python.org/3.11/) * [PEP 664](https://www.python.org/dev/peps/pep-0664/), 3.11 Release Schedule * Report bugs at [https://bugs.python.org](https://bugs.python.org). * [Help fund Python and its community](/psf/donations/). # And now for something completely different The Planck time is the time required for light to travel a distance of 1 Planck length in a vacuum, which is a time interval of approximately `5.39*10^(−44)` s. No current physical theory can describe timescales shorter than the Planck time, such as the earliest events after the Big Bang, and it is conjectured that the structure of time breaks down on intervals comparable to the Planck time. While there is currently no known way to measure time intervals on the scale of the Planck time, researchers in 2020 found that the accuracy of an atomic clock is constrained by quantum effects on the order of the Planck time, and for the most precise atomic clocks thus far they calculated that such effects have been ruled out to around `10^−33` s, or 10 orders of magnitude above the Planck scale. # We hope you enjoy the new releases! Thanks to all of the many volunteers who help make Python Development and these releases possible! Please consider supporting our efforts by volunteering yourself or through organization contributions to the Python Software Foundation. https://www.python.org/psf/ Regards from sunny London, Pablo Galindo Salgado

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[RELEASE] Python 3.9.13 is now available
by Łukasz Langa May 17, 2022

May 17, 2022

This is the thirteenth maintenance release of Python 3.9. Get it here: Python 3.9.13 <https://www.python.org/downloads/release/python-3913/> According to the release calendar specified in PEP 596 <https://www.python.org/dev/peps/pep-0596/>, Python 3.9.13 is the final regular maintenance release. Starting now, the 3.9 branch will only accept security fixes and releases of those will be made in source-only form until October 2025. This is a milestone moment for me as it means that now both of my release series are security-only. My work as release manager enters its final stage. I’m not crying, you’re crying! 🥲 Compared to the 3.8 series, this last regular bugfix release is still pretty active at 166 commits since 3.9.12. In comparison, version 3.8.10, the final regular bugfix release of Python 3.8, included only 92 commits. However, it’s likely that it was 3.8 that was special here with the governance changes occupying core developers’ minds. For reference, version 3.7.8, the final regular bugfix release of Python 3.7, included 187 commits. In any case, 166 commits is quite a few changes, some of which being pretty important fixes. Take a look at the change log <https://docs.python.org/release/3.9.13/whatsnew/changelog.html> for details. <https://discuss.python.org/t/python-3-9-13-is-now-available/15815#major-new…>Major new features of the 3.9 series, compared to 3.8 Some of the new major new features and changes in Python 3.9 are: PEP 573 <https://www.python.org/dev/peps/pep-0573/>, Module State Access from C Extension Methods PEP 584 <https://www.python.org/dev/peps/pep-0584/>, Union Operators in dict PEP 585 <https://www.python.org/dev/peps/pep-0585/>, Type Hinting Generics In Standard Collections PEP 593 <https://www.python.org/dev/peps/pep-0593/>, Flexible function and variable annotations PEP 602 <https://www.python.org/dev/peps/pep-0602/>, Python adopts a stable annual release cadence PEP 614 <https://www.python.org/dev/peps/pep-0614/>, Relaxing Grammar Restrictions On Decorators PEP 615 <https://www.python.org/dev/peps/pep-0615/>, Support for the IANA Time Zone Database in the Standard Library PEP 616 <https://www.python.org/dev/peps/pep-0616/>, String methods to remove prefixes and suffixes PEP 617 <https://www.python.org/dev/peps/pep-0617/>, New PEG parser for CPython BPO 38379 <https://bugs.python.org/issue38379>, garbage collection does not block on resurrected objects; BPO 38692 <https://bugs.python.org/issue38692>, os.pidfd_open added that allows process management without races and signals; BPO 39926 <https://bugs.python.org/issue39926>, Unicode support updated to version 13.0.0; BPO 1635741 <https://bugs.python.org/issue1635741>, when Python is initialized multiple times in the same process, it does not leak memory anymore; A number of Python builtins (range, tuple, set, frozenset, list, dict) are now sped up using PEP 590 <https://www.python.org/dev/peps/pep-0590> vectorcall; A number of Python modules (_abc, audioop, _bz2, _codecs, _contextvars, _crypt, _functools, _json, _locale, operator, resource, time, _weakref) now use multiphase initialization as defined by PEP 489 <https://www.python.org/dev/peps/pep-0489/>; A number of standard library modules (audioop, ast, grp, _hashlib, pwd, _posixsubprocess, random, select, struct, termios, zlib) are now using the stable ABI defined by PEP 384 <https://www.python.org/dev/peps/pep-0384/>. You can find a more comprehensive list in this release’s “What’s New <https://docs.python.org/release/3.9.13/whatsnew/3.9.html>” document. <https://discuss.python.org/t/python-3-9-13-is-now-available/15815#we-hope-y…>We hope you enjoy Python 3.9! Thanks to all of the many volunteers who help make Python Development and these releases possible! Please consider supporting our efforts by volunteering yourself or through organization contributions to the Python Software Foundation. Your friendly release team, Ned Deily @nad <https://discuss.python.org/u/nad> Steve Dower @steve.dower <https://discuss.python.org/u/steve.dower> Łukasz Langa @ambv <https://discuss.python.org/u/ambv>

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Announcing the Python Language Summit 2022 blog posts
by Mariatta May 11, 2022

May 11, 2022

The blog posts about presentations and discussions from Python Language Summit 2022 are now up for your enjoyment. Main article: https://pyfound.blogspot.com/2022/05/the-2022-python-language-summit_016788… - Python without the GIL <https://pyfound.blogspot.com/2022/05/the-2022-python-language-summit-python…> , Sam Gross - Reaching a per-interpreter GIL <https://pyfound.blogspot.com/2022/05/the-2022-python-language-summit-per.ht…> , Eric Snow - The “Faster CPython” project: 3.12 and beyond <https://pyfound.blogspot.com/2022/05/the-2022-python-language-summit_2.html> , Mark Shannon - WebAssembly: Python in the browser and beyond <https://pyfound.blogspot.com/2022/05/the-2022-python-language-summit-python…> , Christian Heimes - F-strings in the grammar <https://pyfound.blogspot.com/2022/05/the-2022-python-language-summit-f.html>, Pablo Galindo Salgado - Cinder Async Optimisations <https://pyfound.blogspot.com/2022/05/the-2022-python-language-summit_60.html>, Itamar Ostricher - The issue and PR backlog <https://pyfound.blogspot.com/2022/05/the-2022-python-language-summit-dealin…>, Irit Katriel - The path forward for immortal objects <https://pyfound.blogspot.com/2022/05/the-2022-python-language-summit_11.html>, Eddie Elizondo and Eric Snow - Lightning talks <https://pyfound.blogspot.com/2022/05/the-2022-python-language-summit.html>, short presentations by Carl Meyer, Thomas Wouters, Kevin Modzelewski, and Larry Hastings Thanks Alex Waygood for the write ups! Also thank you to all presenters and attendees for great content and discussions. This is the fourth Language Summit that I co-chaired with Łukasz, and also my last one. I’m stepping down from this responsibility to free up my time to take on other responsibilities and challenges. I’m grateful to have been given this opportunity to serve the Python community. This has been a great privilege and valuable experience. Thank you Lukasz for working alongside me the past four years, and Senthil for helping out this year. Thank you!

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Welcome Erlend Aasland to the team!
by Brett Cannon May 9, 2022

May 9, 2022

EOM

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[RELEASE] The first Python 3.11 beta (3.11.0b1) is available - Feature freeze is here
by Pablo Galindo Salgado May 8, 2022

May 8, 2022

We did it, team!! After quite a bumpy release process and a bunch of last-time fixes, we have reached **beta 1** and **feature freeze**. What a ride eh? You can get the shiny new release artefacts from here: https://www.python.org/downloads/release/python-3110b1/ ## This is a beta preview of Python 3.11 Python 3.11 is still in development. 3.11.0b1 is the first of four planned beta release previews. Beta release previews are intended to give the wider community the opportunity to test new features and bug fixes and to prepare their projects to support the new feature release. We **strongly encourage** maintainers of third-party Python projects to **test with 3.11** during the beta phase and report issues found to [the Python bug tracker](https://bugs.python.org) as soon as possible. While the release is planned to be feature complete entering the beta phase, it is possible that features may be modified or, in rare cases, deleted up until the start of the release candidate phase (Monday, 2021-08-02). Our goal is to have no ABI changes after beta 4 and as few code changes as possible after 3.11.0rc1, the first release candidate. To achieve that, it will be **extremely important** to get as much exposure for 3.11 as possible during the beta phase. Please keep in mind that this is a preview release and its use is **not** recommended for production environments. # Major new features of the 3.11 series, compared to 3.10 Python 3.11 is still in development. This release, 3.11.0b1 is the **first** of four beta releases. Beta release previews are intended to give the wider community the opportunity to test new features and bug fixes and to prepare their projects to support the new feature release. Many new features for Python 3.11 are still being planned and written. Among the new major new features and changes so far: * [PEP 657](https://www.python.org/dev/peps/pep-0657/) -- Include Fine-Grained Error Locations in Tracebacks * [PEP 654](https://www.python.org/dev/peps/pep-0654/) -- Exception Groups and except* * [PEP 673](https://www.python.org/dev/peps/pep-0673/) -- Self Type * [PEP 646](https://www.python.org/dev/peps/pep-0646/)-- Variadic Generics * [PEP 680](https://www.python.org/dev/peps/pep-0680/)-- tomllib: Support for Parsing TOML in the Standard Library * [PEP 675](https://www.python.org/dev/peps/pep-0675/)-- Arbitrary Literal String Type * [PEP 655](https://www.python.org/dev/peps/pep-0655/)-- Marking individual TypedDict items as required or potentially-missing * [bpo-46752](https://bugs.python.org/issue46752)-- Introduce task groups to asyncio * The Faster Cpython Project <https://github.com/faster-cpython> is already yielding some exciting results. Python 3.11 is up to 10-60% faster than Python 3.10. On average, we measured a 1.22x speedup on the standard benchmark suite. See Faster CPython <https://docs.python.org/3.11/whatsnew/3.11.html#faster-cpython>for details. * Hey, **fellow core developer,** if a feature you find important is missing from this list, let me know. The next pre-release of Python 3.11 will be 3.11.0b2, currently scheduled for Monday, 2022-05-30. # More resources * [Online Documentation](https://docs.python.org/3.11/) * [PEP 664](https://www.python.org/dev/peps/pep-0664/), 3.11 Release Schedule * Report bugs at [https://bugs.python.org](https://bugs.python.org). * [Help fund Python and its community](/psf/donations/). # And now for something completely different The holographic principle is a tenet of string theories and a supposed property of quantum gravity that states that the description of a volume of space can be thought of as encoded on a lower-dimensional boundary to the region—such as a light-like boundary like a gravitational horizon. First proposed by Gerard 't Hooft, it was given a precise string-theory interpretation by Leonard Susskind, who combined his ideas with previous ones of 't Hooft and Charles Thorn.[ Leonard Susskind said, “The three-dimensional world of ordinary experience––the universe filled with galaxies, stars, planets, houses, boulders, and people––is a hologram, an image of reality cited on a distant two-dimensional (2D) surface." As pointed out by Raphael Bousso, Thorn observed in 1978 that string theory admits a lower-dimensional description in which gravity emerges from it in what would now be called a holographic way. The holographic principle was inspired by black hole thermodynamics, which conjectures that the maximal entropy in any region scales with the radius squared, and not cubed as might be expected. In the case of a black hole, the insight was that the informational content of all the objects that have fallen into the hole might be entirely contained in surface fluctuations of the event horizon. The holographic principle resolves the black hole information paradox within the framework of string theory. However, there exist classical solutions to the Einstein equations that allow values of the entropy larger than those allowed by an area law, hence in principle larger than those of a black hole. These are the so-called "Wheeler's bags of gold". The existence of such solutions conflicts with the holographic interpretation, and their effects in a quantum theory of gravity including the holographic principle are not fully understood yet. # We hope you enjoy the new releases! Thanks to all of the many volunteers who help make Python Development and these releases possible! Please consider supporting our efforts by volunteering yourself or through organization contributions to the Python Software Foundation. https://www.python.org/psf/ Regards from chilly London, Your friendly release team, Pablo Galindo Salgado

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Release of Python 3.11 beta 1 is currently blocked
by Pablo Galindo Salgado May 6, 2022

May 6, 2022

Hi everyone, Today we need to start the release of Python 3.11 beta 1. Currently, we have the following blockers: * https://github.com/python/cpython/issues/91162 (was deferred blocker - but all deferred blockers are bumped to release blockers on beta1). * https://github.com/python/cpython/issues/91350 * We have 3 buildbots failing: https://buildbot.python.org/all/#/release_status (some of the failures are due to flaky tests but others look real). Please, if you are involved in the above issues check if they are resolved or if they are not released blockers (notice any semantic change, API change, public data structure change or grammar change must be done before beta 1 is released). I will look at the buildbots later today but if you have some time to investigate, that would help a lot! *I am blocking the main branch so only the release team can merge changes* until these problems are addressed and we can continue with the release. Please, add me as a reviewer to any PR that needs to be merged to address these issues or any other change that *absolutely needs to go into beta 1*. Thanks for your help! Regards from sunny London, Pablo Galindo Salgado

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3.11 feature freeze coming up?
by Ethan Furman May 5, 2022

May 5, 2022

Is this still scheduled for Thursday? -- ~Ethan~

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New triagers: Slateny, Shantanu, CAM Gerlach, Adam Turner, Pradyun Gedam, Ned Batchelder
by Jelle Zijlstra May 3, 2022

May 3, 2022

We have added several new triagers today: - Shantanu (@hauntsaninja), who has been active especially around typing for years and has also made several dozen contributions to CPython ( https://github.com/python/core-workflow/issues/443) - @slateny, who has made a number of thoughtful contributions to CPython docs over the last few months ( https://github.com/python/core-workflow/issues/444) - CAM Gerlach (@CAM-Gerlach), who is a member of the docs community group and also a PEP editor (https://github.com/python/core-workflow/issues/445) - Adam Turner (@AA-Turner), who is a member of the docs community group and also a PEP editor (https://github.com/python/core-workflow/issues/445) - Pradyun Gedam (@pradyunsg), who is a member of the docs community and a maintainer of pip (https://github.com/python/core-workflow/issues/445) - Ned Batchelder (@nedbat), who is a member of the docs community and has contributed more to Python than I could possibly list. I am excited to welcome them all to our community!

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