Itertools cycle method explained

The cycle method makes an iterator returning elements from the iterable and saving a copy of each. When the iterable is exhausted, return elements from the saved copy. Repeats indefinitely.

from itertools import cycle

start = 0
stop =  7
for number in cycle(range(0,3)):
    start += 1
    if start > stop:
        break
    print number 

0
1
2
0
1
2
0