reusing generators

[kmdaily at gmail.com]

Hello, I have a two large files that I need to read in records from
and compare in a pairwise fashion: Memory is an issue, so I want to
use a generator to get each record one at a time. However, doing the
comparisons with nested for loops, the inner generator will run out of
items. How can I restart the generator from the beginning of the file
each time through the outer loop? Thanks!