关于__bases__

cuibaowenown2

1. class A:
   
2.     def get_a(self):
   
3.         print('get_a...........')
   
4. 
   
5. class B:
   
6.     def get_b(self):
   
7.         print('get_b...........')
   
8. 
   
9. A.__bases__ += (B,)
   

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1. >>> A.__bases__ += (B,)
   
2. Traceback (most recent call last):
   
3.   File "<pyshell#36>", line 1, in <module>
   
4.     A.__bases__ += (B,)
   
5. TypeError: Cannot create a consistent method resolution
   
6. order (MRO) for bases object, B

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