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import typing
from collections import deque, defaultdict
from collections.abc import Set
from inspect import isclass
from typish.functions._is_from_typing import is_from_typing
def get_origin(t: type) -> type:
"""
Return the origin of the given (generic) type. For example, for
``t=List[str]``, the result would be ``list``.
:param t: the type of which the origin is to be found.
:return: the origin of ``t`` or ``t`` if it is not generic.
"""
from typish.functions._get_simple_name import get_simple_name
simple_name = get_simple_name(t)
result = _type_per_alias.get(simple_name, None)
if isclass(t) and not is_from_typing(t):
# Get the origin in case of a parameterized generic.
result = getattr(t, '__origin__', t)
elif not result:
result = getattr(typing, simple_name, t)
return result
_type_per_alias = {
'List': list,
'Tuple': tuple,
'Dict': dict,
'Set': set,
'FrozenSet': frozenset,
'Deque': deque,
'DefaultDict': defaultdict,
'Type': type,
'AbstractSet': Set,
'Optional': typing.Union,
}