Calling super in mixins

gistfile1.py

class A(object):
    def m(self):
        print 'A1'
        try:
            super(A, self).m()
        except AttributeError:
            print 'A has no super.m()!'
        print 'A2'

class B(object):
    def m(self):
        print 'B1'
        try:
            super(B, self).m()
        except AttributeError:
            print 'B has no super.m()!'
        print 'B2'

class C(A, B):
    def m(self):
        print 'C1'
        super(C, self).m()
        print 'C2'

c = C()
c.m()
print C.__mro__