class A(object)
class B(object)
self.a = A
class C(B):
self.a = D
I want to make sure D is always a subclass of A. Is that doable in Python w/o using type hints?
Asked
Active
Viewed 20 times
0
rivu
- 2,004
- 2
- 29
- 45
-
2type-hints wouldn't do that. You have to check the `type` of objects at runtime yourself. – juanpa.arrivillaga Aug 25 '18 at 20:33
-
i meant is there a way to _enforce_ that contract? – rivu Aug 25 '18 at 20:34
-
2You have to check the types yourself at runtime using `type` or `isinstance`. Python doesn't have static type checking out of the box, you'd have to use type-hints and then a third-party static-type checker like `mypy`. – juanpa.arrivillaga Aug 25 '18 at 20:35