reusing generators

[kmdaily]

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!

 

[Paul Rubin]

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!

If the files are that large, maybe you want to rethink that quadratic
algorithm. But if you really want to restart the generator, the
simplest way is just close and re-open the file.