List Operation

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S = 'abcdef'
N = 3

print(list(zip(*[iter(S)] * N)))

will Print: [('a','b','c'),('d','e','f')]
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ROTATE AN LIST 

>>> from collections import deque
>>> d=deque([1,2,3,4,5])
>>> d
deque([1, 2, 3, 4, 5])
>>> d.rotate(2)
>>> d
deque([4, 5, 1, 2, 3])
>>> d.rotate(-2)
>>> d
deque([1, 2, 3, 4, 5])
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