Pandas21 compat

[MichaelTiemannOSC]

• [ ] Closes # (insert issue number)
• [x] Executed pre-commit run --all-files with no errors
• [x] The change is fully covered by automated unit tests
• [ ] Documented in docs/ as appropriate
• [x] Added an entry to the CHANGES file

CI/CD doesn't quite work yet because we don't have a Pandas 2.1 rc to point to. But comments are welcome!

[MichaelTiemannOSC]

Pandas 2.1rc0 has been released: https://github.com/pandas-dev/pandas/releases/tag/v2.1.0rc0

[andrewgsavage]

you can add the 2.1rc to https://github.com/hgrecco/pint-pandas/blob/bf84e37ed13d032a13edec948c1990909d920dec/.github/workflows/ci.yml#L11C10-L11C10 to get CI to test against it

[MichaelTiemannOSC]

I see that while these changes run happily with later versions of Pint and Pandas, there are many errors in the CI/CD system for Pandas 2.0.2 and Pint 0.21.3. I'll look at those and see how much of a gap there is to bridge, or whether these changes really are only for 2.1 and beyond.

[MichaelTiemannOSC]

Looking at Pandas 2.0.3 failures:

• TestIssue174 failures appear fixed by this Pandas commit: ENH: better dtype inference when doing DataFrame reductions (https://github.com/pandas-dev/pandas/pull/52788). I imported this test case into the PintPandas test suite to catch reduce failures early and specifically. I can disable the test when Pandas version < 2.1.
• test_map is a new extension test added as part of this change set. It fails because earlier versions of Pandas simply raise NotImplementedError when na_action is not None. I'll add a pytest.skip rule to skip the ignore case when Pandas version < 2.1.
• many test_arith_series_with_scalar tests failing, likely fixed by this Pandas commit: https://github.com/pandas-dev/pandas/pull/54365. Since we control the code for calling check_opname we can add (back) the missing exc parameter that was removed when Pandas 2.1 refactored this interface.

I'll update this list with other problems I find, or rewrite text to describe how the fixes were implemented (as a start for the WhatsNew).

[andrewgsavage]

this is looking great, thanks for putting this together.

Just needs adding the 2.1rc to the CI and a changes note

[MichaelTiemannOSC]

Ugh..the map changes worked for Pandas 2.1, but need fixing for 2.0.2. I'm on it...

[andrewgsavage]

bors r+

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