flake8-mypy
#flake8のプラグイン
https://github.com/ambv/flake8-mypy
2017年で更新が止まっているため使うのは非推奨と考えている
It was created in early 2017 when Mypy performance was often insufficient for in-editor linting.
These days Mypy is accelerated with mypyc, as well as uses aggressive caching to speed up incremental checks.