Python 3.11.0 is almost ready. This release, 3.11.0rc1, is the penultimate release preview. You can get it here:

## This is the first release candidate of Python 3.11

https://www.python.org/downloads/release/python-3110rc1/

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 ](https://github.com/issues).

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](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 680](https://www.python.org/dev/peps/pep-0680/) -- tomllib: Support
for Parsing TOML in the Standard Library
* [gh-90908](https://github.com/python/cpython/issues/90908) -- Introduce
task groups to asyncio
* [gh-34627](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.

## Typing and typing language changes

* [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 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

<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 3.11.0rc2, currently scheduled
for Monday, 2022-09-05.

# 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://github.com/python/cpython/issues](https://github.com/python/cpython/issues)
.
* [Help fund Python and its community](/psf/donations/).

# 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.

https://www.python.org/psf/

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

Your friendly release team,

Ned Deily @nad https://discuss.python.org/u/nad
Steve Dower @steve.dower https://discuss.python.org/u/steve.dower
Pablo Galindo Salgado @pablogsal https://discuss.python.org/u/pablogsal

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