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Python 3.11.0b2

Release Date: May 31, 2022

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 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 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.

Note: There is a known issue with pytest and this release. If you get failures running pytest you can work around temporarily the problem by adding --assert=plain to the pytest command line invocation

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
  • PEP 681-- Data Class Transforms
  • bpo-46752-- Introduce task groups to asyncio
  • bpo-433030 -- 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

(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 3.11.0b3, currently scheduled for Thursday, 2022-06-16.

More resources

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.

Full Changelog


Version Operating System Description MD5 Sum File Size GPG
Gzipped source tarball Source release 2be67f6340dc81e844431d40e15b9845 24.7 MB SIG
XZ compressed source tarball Source release 508ec02987e4f13631c8ccc7e014527f 18.6 MB SIG
macOS 64-bit universal2 installer macOS for macOS 10.9 and later 87883130f750c41363cbd3da2c27e0cc 40.1 MB SIG
Windows installer (64-bit) Windows Recommended be03987219bd0bd2ed45e03092792d71 23.7 MB SIG
Windows installer (32-bit) Windows 04c4ec7d95454cc0c8c27bd4124c1b25 22.6 MB SIG
Windows installer (ARM64) Windows Experimental 6e66b99f10ddf09132acadec323c35a5 22.8 MB SIG
Windows embeddable package (64-bit) Windows f3588fe5a48cd7bb1a8a010219ca79d9 10.0 MB SIG
Windows embeddable package (32-bit) Windows 2c2edf675ac2f1d24bbc0803c887ef21 9.1 MB SIG
Windows embeddable package (ARM64) Windows e99cde40e73d7ef8f4a03128344dc912 9.3 MB SIG