class A:
    def __init__(self):
        print('A.__init__')

class B(A):
    def __init__(self):
        super().__init__()
        print('B.__init__')

class C(A):
    def __init__(self):
        super().__init__()
        print('C.__init__')

class D(B, C):
    def __init__(self):
        super().__init__()
        print('D.__init__')

print(D.__mro__)
d = D()