simulate enumerate in python 2.1

[Terry Reedy]

<eight02645999 at yahoo.com> wrote in message 
news:1152549048.932608.301130 at m79g2000cwm.googlegroups.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

Didn't generators and the new iterator protocol arrived in 2.2?
If so you have to write an iterator in the older __getitem__ protocol, 
which should be in the 2.1 docs.

tjr