Web Reference: Dec 2, 2006 · Function annotations, both for parameters and return values, are completely optional. Function annotations are nothing more than a way of associating arbitrary Python expressions with various parts of a function at compile-time. May 10, 2019 · Function annotations are arbitrary python expressions that are associated with various part of functions. These expressions are evaluated at compile time and have no life in python’s runtime environment. Until that day (which will never come), the main uses of Python's function annotations will be the one-off uses described in the other answers. For the time being, you can forget about smart static analyzers, compiler assurances, java-based tool chains, etc.
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