做了个测试，概念还是不很清楚
在mixin上用处应该比较大


class A1(object):
    def access(self,m):
        print '%s in A1'%(m)
        super(A1,self).access(m)

class A2(object):
    def access(self,m):
        print '%s in A2'%(m)
        #super(A2,self).access(m)



class A11(A1):
    def access(self,m):
        print '%s in A11'%(m)
        super(A11,self).access(m)



class B1(A11,A2):
    def access(self,m):
        print '%s in B1'%(m)
        super(B1,self).access(m)



B1().access('123')



===============
D:\>python a1.py
123 in B1
123 in A11
123 in A1
123 in A2


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