python multiple inheritance / mixin MRO

multi_mixins.py

class Base:

    def say(self, val):
        print("base says", val)


class A(Base):

    def say(self, val):
        print("say A")
        super().say("A")


class B(Base):

    def say(self, val):
        print("say B")
        super().say("B")


class Z(A, B):
    
    def say(self):
        super().say(None)


if __name__ == "__main__":
    print(Z.mro())
    Z().say()