On 2021-05-04, Łukasz Langa wrote:
> 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.

Testing with Python 3.10b1 is not easy, at least for me.  Here is a
list of initial problems I ran into, from memory:

- Cython doesn't work because of _PyGen_Send change [1]

- scipy cannot be installed because it has requires_python =
  ">=3.7,<3.10".  If you manually install from source, it seems to
  work.

- numpy cannot be installed because of _Py_HashDouble() change [2]

- trio cannot be used because of TracebackException.__init__ changes [3]

For the above problems, I would suggest the 3rd party package has
the issue and it's not a problem with the Python release.  However,
I guess that few people are using Python without 3rd party packages.
So, it seems unsurprising that beta and RC releases are not well
tested.  It has taken me quite a few hours to get a working version
of Python 3.10 with all required dependancies such that I can run
unit tests for some application code.

Can we do any things to improve the situation?  Perhaps using the
pre-release functionality of PyPI would help.  We would have to
somehow encourage 3rd party packages to upload pre-releases that are
compatible with our beta/RC releases.


1. https://github.com/cython/cython/issues/3876
2. https://github.com/numpy/numpy/issues/19033
3. https://github.com/python-trio/trio/issues/1899
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