pint 0.24 / numpy 2.0 / python 3.9 issues

[keewis]

numpy>=2 will include a couple of breaking changes (to be released soonish), so it would be good to have a release of pint before that (I'd also love to have #1922 in a release, as it will fix some typing issues on python>=3.12)

Most of the urgent issues have already been fixed, the only thing left is #1971.

Other than that, __array__ has gained a optional copy kwarg which we should add (the version of __array__ without copy will cause a deprecation warning).

[cmutel]

In case anyone is having weird pint errors, or getting this error:

AttributeError: module 'numpy' has no attribute 'cumproduct'. Did you mean: 'cumprod'?

It's because you installed Numpy 2.0.RC1, which isn't yet supported.

[andrewgsavage]

I'm not sure how best to handle the __array__(copy) issue, we don't handle other optional args at present.
Other than that seems like 2.0 works now - I've added it to the matrix.(maybe too a bit too many places)

[andrewgsavage]

I think #1978 and #1960 could be merged if someone has the time to review.

Otherwise I think we're ready for a new release. Are there any other PRs that could be merged?

[keewis]

I would forward copy to the wrapped array, but in any case this is not urgent, since not having that argument will warn, not raise.

#1960 is a documentation-only PR (and from a quick glance I can't see anything wrong), so I think that PR is fine?

[dopplershift]

We're officially on the clock here, as NumPy 2.0 will release 16 June 2024.

It would be good to get some kind of release out the door since currently importing pint 0.23 with numpy 2 installed results in the AttributeError noted above.

I'm going to update on conda-forge to add a constraint for numpy < 2.

[jakirkham]

Do we know what issues still remain here?

Curious if anyone has tried to run the test suite with NumPy 2. If so, would be curious to know what that reveals

[andrewgsavage]

We're officially on the clock here, as NumPy 2.0 will release 16 June 2024.

I've released a pre-release. We've said to leave a week before full release so 0.24 can be released on the 8th.

[andrewgsavage]

0.24 released

[jakirkham]

Thanks Andrew! 🙏

[takluyver]

If anyone else is still seeing the no attribute 'cumproduct' error, note that NumPy 2.0 is compatible with Python 3.9 and up, but Pint 0.24 requires Python 3.10 or above. So unfortunately, pip install numpy pint on Python 3.9 results in pint not being importable at all.