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  1.  
  2. class LikeDate:
  3.     def __eq__(self, other):
  4.          if isinstance(other, LikeDate):
  5.              return True
  6.          else:
  7.               return NotImplemented
  8.     def __ge__(self, other):
  9.          if isinstance(other, LikeDate):
  10.              return True
  11.          else:
  12.               return NotImplemented
  13.  
  14. class LikeInt:
  15.     def __eq__(self, other):
  16.          if isinstance(other, LikeInt):
  17.              return True
  18.          else:
  19.              return False
  20.  
  21.     def __ge__(self, other):
  22.          if isinstance(other, LikeInt):
  23.              return True
  24.          else:
  25.               return NotImplemented
  26.  
  27. a = LikeDate()
  28. b = LikeInt()
  29. print(a == b) # False
  30. print(a == 0) # False, because int provides an __eq__ method that returns False
  31. print(a >= 0) # Error, because nether LikeDate nor int provides a definite comparison for __ge__
  32. print(a >= b) # Error, because neither objects provide a comparable __ge__
Runtime error #stdin #stdout #stderr 0.04s 9404KB
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stdin
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Standard input is empty
stdout
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False
False
stderr
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Traceback (most recent call last):
  File "./prog.py", line 31, in <module>
TypeError: unorderable types: LikeDate() >= int()
https://ideone.com/BEJxdW
language:
Python 3 (python  3.9.5)
created:
6 years ago
visibility:
public

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