Function Annotations
Function annotations are defined in PEP 3107. They allow attaching data to the arguments and return of a function. The behaviour of annotations is not defined by the language - and left to third party frameworks. For example, a library could be written to handle static typing:
def haul(item: Haulable, *vargs: PackAnimal) -> DistanceRead more about this topic: Python Syntax And Semantics
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