iterating a span of a list

[DeaD_EyE]

import itertools
from functools import partial


def window(sequence, window_size, uncomplete=True, fillvalue=None):
    if uncomplete:
        izip = partial(itertools.zip_longest, fillvalue=fillvalue)
    else:
        izip = zip
    yield from izip(*[iter(sequence)] * window_size)

l = list(range(10))
for chunk in window(l, 3):
    print(chunk)

Output:
(0, 1, 2)
(3, 4, 5)
(6, 7, 8)
(9, None, None)

If you use uncomplete=False, the zip function will be used.
The zip function stops iterating, if there are not enough values, to fill the window.

l = list(range(10))
for chunk in window(l, 3, uncomplete=False):
    print(chunk)

Output:
(0, 1, 2)
(3, 4, 5)
(6, 7, 8)