From Newsgroup: comp.lang.python.announce

After fighting with some release blockers, implementing a bunch of GC
traversal functions, and fixing some pending reference leaks, we finally
have Python 3.10.0 beta 2 ready for you! Thanks to everyone that helped to unblock the release!

https://www.python.org/downloads/release/python-3100b2/

# This is a beta preview of Python 3.10

Python 3.10 is still in development. 3.10.0b2 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 3.10** 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 3.10.0rc1, the first release candidate. To achieve that, it
will be **extremely important** to get as much exposure for 3.10 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.

The next pre-release of Python 3.10 will be 3.10.0b3, currently scheduled
for Thursday, 2021-06-17.

# And now for something completely different

The Ehrenfest paradox concerns the rotation of a "rigid" disc in the theory
of relativity. In its original 1909 formulation as presented by Paul
Ehrenfest in relation to the concept of Born rigidity within special relativity, it discusses an ideally rigid cylinder that is made to rotate
about its axis of symmetry. The radius R as seen in the laboratory frame is always perpendicular to its motion and should therefore be equal to its
value R0 when stationary. However, the circumference (2πR) should appear Lorentz-contracted to a smaller value than at rest. This leads to the
apparent contradiction that R = R0 and R < R0.

# We hope you enjoy those 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.

Regards from very sunny London,

Your friendly release team,
Pablo Galindo @pablogsal
Ned Deily @nad
Steve Dower @steve.dower
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