CI: Enable testing with Python 3.10

[akihironitta]

What does this PR do?

Part of Lightning-AI/pytorch-lightning#9980.

TODO:

• Agree on the Python version matrix to test with in CI
• Update CHANGELOG
• Update docs (if any required)

Before submitting

• Was this discussed/approved via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• [n/a] Did you write any new necessary tests?

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[codecov]

Codecov Report

Merging #1132 (cc079de) into master (412002c) will increase coverage by 0%.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1132   +/-   ##
======================================
  Coverage      94%     94%           
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  Files         182     182           
  Lines        8146    8147    +1     
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+ Hits         7653    7654    +1     
  Misses        493     493           

[Borda]

I have tried a while back too #689, but the challenge here is that not all packages we use for testing have been built for py3.10

  ERROR: Failed building wheel for numpy
ERROR: Could not build wheels for numpy, which is required to install pyproject.toml-based projects
Failed to build numpy

[akihironitta]

ERROR: Failed building wheel for numpy
ERROR: Could not build wheels for numpy, which is required to install pyproject.toml-based projects
Failed to build numpy

The incompatibility between pypesq and numpy seems no longer an issue as confirmed in CI runs on commit 01c9858.

[akihironitta]

Another issue I saw was that all tests failed with Python 3.10 on Windows. The cause should be PyTorch still doesn't support Python 3.10 on Windows.

RuntimeError: Numpy is not available

https://github.com/Lightning-AI/metrics/runs/7273421499?check_suite_focus=true

Currently, PyTorch on Windows only supports Python 3.7-3.9; Python 2.x is not supported.

• https://pytorch.org/get-started/locally/#windows-python
• https://discuss.pytorch.org/t/numpy-is-not-available-error/146192

[Borda]

@akihironitta I guess it is ready now, right?

[akihironitta]

I'm still waiting for a response in https://discuss.pytorch.org/t/numpy-is-not-available-error/146192/, but we can add Python 3.10 on Windows later as we get an update from them.

So, yes, this is ready!

[Borda]

I'm still waiting for a response in https://discuss.pytorch.org/t/numpy-is-not-available-error/146192/, but we can add Python 3.10 on Windows later as we get an update from them.

yes, lets merge it and update later when it is resolved 🐰

[justusschock]

LGTM! More of a general question:

How many Python versions do we want to keep supporting? All of them until their EOL?

[akihironitta]

How many Python versions do we want to keep supporting? All of them until their EOL?

@justusschock @Borda Or until Colab/Kaggle updates the version from 3.7 to 3.8, for example?

---

Found an interesting website which we could utilise: https://pyreadiness.org
(I found it via https://stackoverflow.com/questions/70714622/why-is-colab-still-running-python-3-7).