If I have
class A:
pass
def my_func(my_dict: typing.Dict[str, A]):
pass
How can I find the type of the values in this dict? Basically, how can I figure out that the values that go into my_dict are supposed to be of type A?
To give some context I have two dataclasses
@dataclass
class B:
x: str
@dataclass
class C:
y: Dict[str, B]
I’m trying to look at class C and figure out which object I need to instantiate. In this example, I want to create object B.
class_type = C.__annotations__["y"] # this returns typing.Dict[str, B]
# now need to create the object
b = class_type[1](x="bar") # index 1 to retrieve the B class in typing.Dict[str, B]
c = C(y = {"foo": b})
I’m trying to create b but obviously index of 1 in a mutable map doesn’t work.
>Solution :
Combine answer from here with __annotations__[<key>] and you will get what you need
print(typing.get_args(my_func.__annotations__['my_dict']))
# will return (<class 'str'>, <class '__main__.A'>)