Trying to run mypy on a fully updated Leap 15.1 fails with:

pkg_resources.DistributionNotFound: The 'typed-ast<1.4.0,>=1.3.1' distribution
was not found and is required by mypy

I see that the originally shipped version 1.3.1-lp151.1.1 of python3-typed-ast
(which was supported by mypy) was updated to 1.4.1-lp151.2.3.1 without also
updating mypy, therefore breaking its dependency (which is incorrectly
expressed in the RPM metadata as just python3-typed-ast >= 1.1.0).

Downgrading python3-typed-ast back to  1.3.1-lp151.1.1 as a workaround makes
mypy work again for me.