[SciPy-Dev] mypy 0.770 is broken on Python 3.9.0a5

[Ralf Gommers]

On Fri, Feb 26, 2021 at 10:13 AM Tirth Patel <tirthasheshpatel at gmail.com>
wrote:

> I recently proposed gh-13613
> (https://github.com/scipy/scipy/pull/13613) which adds CI for type
> checking and noticed this failure:
>
> ```
> scipy/_lib/_uarray/_backend.py:96: error: syntax error in type comment
> [syntax]
> Found 1 error in 1 file (checked 662 source files)
> ```
>
> I don't see any errors with Python 3.8.0 and mypy 0.770, mypy 0.780,
> and mypy 0.812 (latest release). So, this probably has something to do
> with Python 3.9.0a5 (which is currently being installed on
> ubuntu-latest). I checked with mypy 0.780, mypy 0.800, and mypy 0.812
> on Python 3.9.0a5. This error disappears in all those versions but
> dozens of others arise.
>
> I think this error is related to python/mypy#8614
> (https://github.com/python/mypy/issues/8614) which got fixed in
> mypy>=0.780.
>
> So, if I am not wrong, we have two options here:
>   - Stick with Python 3.8 and mypy 0.770.
>   - Use mypy latest (0.812 currently) which works for both Python 3.8
> and Python 3.9.
>
> I think the latter would be a better choice as NumPy does it and mypy
> is changing fast so it will help keep up with new changes. I have a
> fix for all the errors occurring with mypy latest (mypy 0.812) and
> would add the changes to the PR if there is a consensus to go that
> way!
>

Yes we can bump mypy versions, no problem to update to the most recent
version if needed. It's not a runtime dependency, so there's not much of a
downside to updating other than a few maintainers and contributers needing
to update their local version.

Thanks for working on this Tirth!

Cheers,
Ralf



> --
> Kind Regards,
> Tirth Patel
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