Python 3.8+typingfunction

typing.get_origin

introspection

Return the unsubscripted origin of a generic: get_origin(list[int]) → list.

Syntax

typing.get_origin(tp)

For anything that isn't a subscripted generic it returns None (get_origin(int) → None), which is the standard runtime test for whether a value is a parameterized generic. It's almost always paired with get_args: the origin says which container, the args say what's inside.

Examples

# Python 3.9+
from typing import get_origin, get_args, Union
print(get_origin(list[int]) is list)   # → True
print(get_origin(dict[str, int]) is dict)   # → True
print(get_origin(tuple[int, ...]) is tuple)   # → True
print(get_origin(Union[int, str]) is Union)   # → True
print(get_origin(int))   # → None
print(get_args(list[int]))   # → (<class 'int'>,)

See also

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