GitHub Action to show how to run SciPy on Python 3.13 prerelease

[cclauss]

Add a GitHub Action to demonstrate how to run SciPy on Python 3.13 before its release in Oct. 2024

• https://www.python.org/downloads/release/python-3130b1/
• BUG: pip install scipy from git fails with "openblas" not found #16308 (comment)

Reference issue

What does this implement/fix?

Additional information

[andyfaff]

Thank you for being proactive. However, we modify an existing ci entry for this closer to the time. we'll probably start working towards this when numpy starts testing, or making nightly wheels.

[cclauss]

Agreed. I was happy to see that numpy seems to work without modifications. I know they now have some focus on v2.0.0rc2. https://github.com/numpy/numpy/releases

Please feel free to close this. Its presence (even if closed) might help others to prepare for Py3.13.

[tylerjereddy]

Let's close this for now yeah, per comments above.

[andyfaff]

seems like I haven't been paying attention. numpy is already testing on 3.13-dev, e.g. https://github.com/numpy/numpy/actions/runs/9069897180/job/24920481959, https://github.com/numpy/numpy/blob/1d3201e061ff26ef5defa90b45ce7f5a32f2219f/.github/workflows/linux.yml#L58

[andyfaff]

No wheels yet though. Presumably this means a large part of the build chain is ready, numpy/cython/meson.

[tylerjereddy]

Yeah, I believe the push for free-threading CPython support may be energizing some early efforts for support as well.