foo.py

#!/usr/bin/env python


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


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


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

C()