mro.py

class A(object):
    def foo(self):
        print(1)

class B(object):
    def foo(self):
        print(2)
        
class C(A, B):
    @staticmethod
    def reverse_mro(cls):
        cls.__bases__ = cls.__bases__[::-1]
    def __init__(self):
        self.reverse_mro(self.__class__)
        self.foo()
        
>>> 2