def zip_with_index(self, start=0):
"""
Zips the sequence to its index, with the index being the second element of each tuple.
>>> seq(['a', 'b', 'c']).zip_with_index()
[('a', 0), ('b', 1), ('c', 2)]
:return: sequence zipped to its index
"""
return self._transform(transformations.zip_with_index_t(start))