A flymake handler for python files with mypy.
Install mypy:
pip install mypy-lang
Add following lines to emacs init file:
(require 'flymake-mypy)
(add-hook 'python-mode-hook 'flymake-python-mypy-load)
To use new type annotations in python 3.6 (PEP 526) like foo: int, add this line:
(setq flymake-python-mypy-pep526 t)