I've never understood what I'm supposed to do with things like this or mypy when--as is usually the case--I'm making heavy use of other libraries that don't hav

I've never understood what I'm supposed to do with things like this or mypy when--as is usually the case--I'm making heavy use of other libraries that don't have type annotations. The examples and tutorials I've seen always show the code importing standard-library modules and nothing else.