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  1. >>> class A:
  2. ...:     def __iter__(self):
  3. ...:         return iter([1,2,3])
  4. ...:                                                                            
  5. >>> a = A()                                                                    
  6. >>> '__getitem__' in dir(a)                                                    
  7. False
  8. >>> for x in a:
  9. ...:     print(x)
  10. ...:                                                                            
  11. 1
  12. 2
  13. 3
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