simulate enumerate in python 2.1

[eight02645999 at yahoo.com]

hi,
i am using python 2.1. Can i use the code below to simulate the
enumerate() function in 2.3? If not, how to simulate in 2.1?
thanks

from __future__ import generators
def enumerate(sequence):
    index = 0
    for item in sequence:
        yield index, item
        index += 1