From Newsgroup: comp.lang.python.announce

Hi everyone,

Due to a known incompatibility with pytest and the previous beta release (Python 3.11.0b2) and after
some deliberation, me and the rest of the release team have decided to do
an expedited release of
Python 3.11.0b3 so the community can continue testing their packages with pytest and therefore
testing the betas as expected.

# Where can I get the new release?

https://www.python.org/downloads/release/python-3110b3/

# What happened?

Pytest by default rewrites the AST nodes in the testing code to provide
better diagnostics when something
fails in the test. For doing this, it creates new AST nodes that are then compiled. In Python 3.11, after some
changes in the compiler and AST nodes, these new AST nodes that pytest was creating were invalid. This causes
CPython to crash in debug mode because we have several assert statements in
the compiler, but in release mode
this doesn't cause always a crash, but it creates potential corrupted structures in the compiler silently.

In 3.11.0b3 we changed the compiler to reject invalid AST nodes, so what
was a silent problem and a crash in
debug mode turned into an exception being raised. We had a fix to allow the nodes that pytest is creating to work
to preserve backwards compatibility but unfortunately, it didn't make it
into 3.11.0b2.

Is still possible to use pytest with 3.11.0b2 if you add "--assert=plain"
to the pytest invocation but given how many
users would have to modify their test suite invocation we decided to
proceed with a new release that has the fix.

# What happens with future beta releases

Python 3.11.0b3 should be considered as an extra beta release. Instead of
four beta releases, we will have five and
the next beta release (3.11.0b4) will happen as scheduled on Thursday, 2022-06-16.

# 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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