Python 3.11.1rc1 is now available

This is the first release candidate of Python 3.11

This release, 3.11.0rc1, is the penultimate release preview. Entering the release candidate phase, only reviewed code changes which are clear bug fixes are allowed between this release candidate and the final release. The second candidate and the last planned release preview is currently planned for Monday, 2022-09-05 while the official release is planned for Monday, 2022-10-03.

There will be no ABI changes from this point forward in the 3.11 series and the goal is that there will be as few code changes as possible.

Call to action


Core developers: all eyes on the docs now

  • Are all your changes properly documented?
  • Did you notice other changes you know of to have insufficient documentation?

Community members

We strongly encourage maintainers of third-party Python projects to prepare their projects for 3.11 compatibilities during this phase. As always, report any issues to the Python bug tracker .

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

Some of the new major new features and changes in Python 3.11 are:

General changes

  • PEP 657 – Include Fine-Grained Error Locations in Tracebacks
  • PEP 654 – Exception Groups and except*
  • PEP 680 – tomllib: Support for Parsing TOML in the Standard Library
  • gh-90908 – Introduce task groups to asyncio
  • gh-34627 – Atomic grouping ((?>...)) and possessive quantifiers (*+, ++, ?+, {m,n}+) are now supported in regular expressions.
  • The Faster CPython Project 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 for details.

Typing and typing language changes

  • PEP 673 – Self Type
  • PEP 646 – Variadic Generics
  • PEP 675 – Arbitrary Literal String Type
  • PEP 655 – Marking individual TypedDict items as required or potentially-missing
  • PEP 681 – Data Class Transforms

(Hey, fellow core developer, if a feature you find important is missing from this list, let Pablo know.)

The next pre-release of Python 3.11 will be 3.11.0rc2, currently scheduled for Monday, 2022-09-05.

More resources

And now for something completely different

A quark star is a hypothetical type of compact, exotic star, where extremely high core temperature and pressure have forced nuclear particles to form quark matter, a continuous state of matter consisting of free quarks.

Some massive stars collapse to form neutron stars at the end of their life cycle, as has been both observed and explained theoretically. Under the extreme temperatures and pressures inside neutron stars, the neutrons are normally kept apart by degeneracy pressure, stabilizing the star and hindering further gravitational collapse. However, it is hypothesized that under even more extreme temperature and pressure, the degeneracy pressure of the neutrons is overcome, and the neutrons are forced to merge and dissolve into their constituent quarks, creating an ultra-dense phase of quark matter based on densely packed quarks. In this state, a new equilibrium is supposed to emerge, as a new degeneracy pressure between the quarks, as well as repulsive electromagnetic forces, will occur and hinder total gravitational collapse.

If these ideas are correct, quark stars might occur, and be observable, somewhere in the universe. Theoretically, such a scenario is seen as scientifically plausible, but it has been impossible to prove both observationally and experimentally because the very extreme conditions needed for stabilizing quark matter cannot be created in any laboratory nor observed directly in nature. The stability of quark matter, and hence the existence of quark stars, is for these reasons among the unsolved problems in physics.

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.

If you have any questions, please reach out to me or another member of the release team :slight_smile:

Your friendly release team,

Ned Deily @nad Profile - nad - Discussions on Python.org
Steve Dower @steve.dower Profile - steve.dower - Discussions on Python.org
Pablo Galindo Salgado @pablogsal Profile - pablogsal - Discussions on Python.org

15 Likes

These are my favorite part of the release notes! Just like when my band plays, I’m gonna make a request: can you do black hole direct collapse next?

4 Likes

Unofficial WebAssembly builds are available at https://github.com/tiran/cpython-wasm-test/releases/tag/v3.11.0rc1. I have uploaded an interactive REPL to my GitHub page, too. It uses a hack to work around missing HTTP headers and may not work in every browser.

6 Likes

I can try, but it may end too technical :slight_smile:

1 Like

@tiran I tried the WASM REPL on Windows 10 and Firefox. With the font face and size matched, It looks better to me than the standard REPL in Windowx console. However, it does not recognize Tab, making indented code tedious. That may be a FF thing, and in this entry box, Tab shifts focus to the Reply button below.

2 Likes

The builtin REPL is a rudimentary demo without bells and whistles. TAB and cursor keys don’t work yet. Could you please open a feature request?

I have no idea how to do that. The only way I know to open an new issue on a repository is to visit an existing open issue and click the new-issue button on the upper right, and you have no open issues.

I have no idea how to do that. The only way I know to open an new issue on a repository is to visit an existing open issue and click the new-issue button on the upper right, and you have no open issues.

I should have been more clear. Could you please create a new issue in the CPython tracker? The code for the browser REPL is in the CPython source code. My project is just workflow definitions and build scripts.

1 Like