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The tuple.index() method returns an error message that does not allow users to know what element was being looked for inside the tuple:
>>> ().index(1)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ValueError: tuple.index(x): x not in tuple
The list.index() method has a much better error message:
>>> [].index(1) 
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ValueError: 1 is not in list
We could improve tuple.index() so that its behaviour becomes similar to that of list.index().