This is useful for calling functions over a remote connection or from a different language - see instant_api and instant_client for example. More generally, the arguments and return value as seen from ...

Here are some points: First of all, the example with generics proposed by @bwo is fixed and now works correctly, mypy only complains if a function is annotated as returning None, not for inferred None ...

KS3 Procedures and functions Functions in Python When writing programs, we should avoid long, repetitive code. Procedures and functions help to keep our programs simple and short.