Drop support for Python 3.9

[arcondello]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.71%. Comparing base (03a19ae) to head (2860340).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1423      +/-   ##
==========================================
+ Coverage   94.63%   94.71%   +0.08%     
==========================================
  Files         100      100              
  Lines       10605    10605              
==========================================
+ Hits        10036    10045       +9     
+ Misses        569      560       -9     

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[arcondello]

One thing, the CI builds end up installing NumPy from source for the tests because they use a newer manylinux image that we do. IMO that's fine, if a bit slow. We can update our manylinux image in another PR if we like.

[randomir]

LGTM.

Related, you can also drop some deps from tests/requirements.txt that require py<3.9.

[randomir]

Not strictly part of dropping 3.9, but would you add 3.14 to the list?

[arcondello]

Related, you can also drop some deps from tests/requirements.txt that require py<3.9.

Hmm, that leaves some stuff untested. Let me see if I can raise the version or remove that stuff

[randomir]

Hmm, that leaves some stuff untested. Let me see if I can raise the version or remove that stuff

What I meant was, drop the environment marker and update the pinned version. Not actually remove the whole dep. But it's not clear to me what

pandas==1.1.4; python_version < '3.9'

actually gives us.. as we never test on a version older than 3.9 🤔

[arcondello]

Yeah, this all needs a detailed maintenance pass. I pushed some new versions so we get testing. We really should deprecate those functions though, or sweep their range in CI.

[randomir]

Was thinking the same while working on #1420. I can do a pass after that PR.