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Python 3.11.0rc1

Release Date: Aug. 8, 2022

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.


Version Operating System Description MD5 Sum File Size GPG
Gzipped source tarball Source release 16fe982ecffb81b603b3f4d9e6c044d6 25.1 MB SIG
XZ compressed source tarball Source release 013eb698ab20c284e5b8373435add767 18.9 MB SIG
macOS 64-bit universal2 installer macOS for macOS 10.9 and later 93f7bbb7a10fe4f773beb6831e3bf423 40.5 MB SIG
Windows installer (64-bit) Windows Recommended 5943d8702e40a5ccd62e5a8d4c8852aa 24.0 MB SIG
Windows installer (32-bit) Windows d2e5420e53d9e71c82b4a19763dbaa12 22.9 MB SIG
Windows installer (ARM64) Windows Experimental aa18d5ba3a35df911ebd80165de40291 23.2 MB SIG
Windows embeddable package (64-bit) Windows fc49be511116c47c44f9774c975f63f0 10.0 MB SIG
Windows embeddable package (32-bit) Windows 74c060c2b674fec528e0a3f99de8ac69 9.1 MB SIG
Windows embeddable package (ARM64) Windows 01b970a96e4424c2fdcbc7ae0f11fc61 9.3 MB SIG