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Infer return type of generic functions based on input #115

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betodealmeida opened this issue Jan 4, 2022 · 0 comments

betodealmeida commented Jan 4, 2022

Is it possible to infer the return type based on the input, for generic functions?

Eg, with this classic example:

from typing import TypeVar, Sequence

T = TypeVar('T')      # Declare type variable

def first(seq: Sequence[T]) -> T:   # Generic function
    return seq[0]

If I know that seq has type Sequence[int], how can I infer that first would return int in that case?

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