Unfortunately, MyPy doesn't work well with libraries or third party packages and treats external objects as `ANY` type. You can work around this with stubs but

Unfortunately, MyPy doesn't work well with libraries or third party packages and treats external objects as `ANY` type. You can work around this with stubs but it's not fun writing type annotations for third party objects / functions. typeshed exists for the standard library and various popular third party libraries[1] to solve this very problem. [1] https://github.com/python/typeshed https://github.com/python/typeshed