Returns a sliding window (of width n) over data from the iterable

sliding_window.py

from itertools import islice

def sliding_window(seq, n=3):
    """
    Returns a sliding window (of width n) over data from the iterable
    s -> (s0,s1,...s[n-1]), (s1,s2,...,sn), ...
    """
    it = iter(seq)
    result = tuple(islice(it, n))
    if len(result) <= n:
        yield result
    for elem in it:
        result = result[1:] + (elem,)
        yield result

for i in sliding_window(range(10),3):
    print(i)