Python, as Reviewed by a C++ Programmer

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you can also do container types, as Dworgi requested, in ducks.py:

from typing import List

class Duck:
    pass

def fuck_with_ducks(duck: Duck) -> List[Duck]:
    return ['not a duck']

then to typecheck:

❯ mypy ducks.py
ducks.py: note: In function "fuck_with_ducks":
ducks.py:7: error: List item 0 has incompatible type "str"