class A(object):
    def foo(self):
        print 'A.foo called'

class B(object):
    def foo(self):
        print 'B.foo called'
        super(B, self).foo()

class C(B,A):
    def foo(self):
        print 'C.foo called'
        super(C, self).foo()

C().foo()


$ python werneck.py 
C.foo called
B.foo called
A.foo called