Question

What’s the right syntax for calling the base constructors of multiple derived classes in python3?

class A:
    def __init__():
        print("A")

class B:
    def __init__():
        print("B")

class C(A,B):
    def __init__():
        super().__init__() # ???

Answer 1

You have to put the super call in the parent classes too. I think how it works is C‘s super gets A and A‘s super get’s B

class A:
    def __init__(self):
        super().__init__()
        print("A")

class B:
    def __init__(self):
        super().__init__()
        print("B")

class C(A,B):
    def __init__(self):
        super().__init__()

Or use this alternative, more explicit syntax which I prefer

class A:
    def __init__(self):
        print("A")

class B:
    def __init__(self):
        print("B")

class C(A,B):
    def __init__(self):
        A.__init__(self)
        B.__init__(self)

This calls the __init__ methods of the A and B classes on an object of the C class.