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Currently, the Sequence ABC doesn't support start and stop arguments for the index() method which limits its usefulness in doing repeated searches (iterating over a target value) and which limits it substitutablity for various concrete sequences such as tuples, lists, strings, bytes, bytearrays, etc.
>>> help(Sequence.index)
Help on method index in module _abcoll:
index(self, value) unbound _abcoll.Sequence method
 S.index(value) -> integer -- return first index of value.
 Raises ValueError if the value is not present.
>>> help(list.index)
Help on method_descriptor:
index(...)
 L.index(value, [start, [stop]]) -> integer -- return first index of value.
 Raises ValueError if the value is not present.
>>> help(str.index)
Help on method_descriptor:
index(...)
 S.index(sub [,start [,end]]) -> int
 
 Like S.find() but raise ValueError when the substring is not found.
>>> help(tuple.index)
Help on method_descriptor:
index(...)
 T.index(value, [start, [stop]]) -> integer -- return first index of value.
 Raises ValueError if the value is not present.
>>> help(bytes.index)
Help on method_descriptor:
index(...)
 S.index(sub [,start [,end]]) -> int
 
 Like S.find() but raise ValueError when the substring is not found.
>>> help(bytearray.index)
Help on method_descriptor:
index(...)
 B.index(sub [,start [,end]]) -> int
 
 Like B.find() but raise ValueError when the subsection is not found.