Break the nested (double) loop in Python [duplicate]

Answer 1

Most times you can use a number of methods to make a single loop that does the same thing as a double loop.

In your example, you can use itertools.product to replace your code snippet with

import itertools
for word1, word2 in itertools.product(buf1, buf2):
    if word1 == word2:
        print "BINGO " + word1 + ":" + word2
        break

The other itertools functions are good for other patterns too.