I'm inspired by TypeScript. TypeScript allows people to add **.d.ts* *to annotate ECMAScript's type. So this can expand the TypeScript's scenes to be used。
So I think can we add an optional mechanism to allow people add the extra file to annotate the existing code. Type Annotation can be used after Python 3.5. but many lib/framework has to be compatible for the Python 3.0-3.4, they can't use annotation. If we have this mechanism, the lib/framework can continue to focus on the function, and the third group can add the extra type annotation for lib/framework I think it should be OK
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