Python cycle Iterator
Python cycle(iterable) iterates through the iterable over and over again till break stops the loop.
>>> from itertools import *
>>> x = cycle('01')
>>> j = 1;
>>> for i in x:
... print(i,j)
... j += 1
... if (j == 7):
... break
...
0 1 1 2 0 3 1 4 0 5 1 6
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