python2中新式类和经典类的多重继承调用顺序

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

class B(A):
    pass

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

class D(B, C): 
    pass

if __name__ == '__main__':
    d = D() 
    d.foo()class A:
def foo(self):
    print('called A.foo(