Django’s post_save signal sends a model class argument – sender – along with the actual instance being saved – instance.
Is there a way to differentiate between the two in type hints?
Example
We have a model User and would like to create a post_save signal:
JavaScript
x
9
1
# …2
@receiver([post_save], sender=User)3
def send_activation_email(4
sender: User, 5
instance: User, 6
# …7
) -> None:8
# …9
As you can see, I have given both sender and instance the same type hint – User. But they are not the same type. The first is a class, and the second is an object. So, is there a way to differentiate the two?
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Answer
What you are looking for is typing.Type.
JavaScript
1
10
10
1
from typing import Type2
# …3
@receiver([post_save], sender=User)4
def send_activation_email(5
sender: Type[User], 6
instance: User, 7
# …8
) -> None:9
# …10
This answer was posted for the clarity and readability thanks to a comment by @Michael0x2a.