Python __index__ special method

Question

>>> class Thing(object):
...     def __index__(self):
...         return 1
... 
>>> thing = Thing()
>>> list_ = [\'abc\', \'def\', \'ghi\'         


        

Answer 1

Dict and List does not implement __getitem__ the same way. Dict objects uses a comparison (__eq__) on __hash__ of objects as key to use in __getitem__.

To make Thing usable for dict you have to implement both hash and eq.