Iterate over N adjacent elements of a list

inwise.py

from itertools import tee, izip

def inwise(iterable, n=2):
    '''Return an iterator over iterable where n adjacent items are returned at
       a time.

       @param n : int
           the number of adjacent items to return'''

    iters = tee(iterable, n=n)

    for i in xrange(1, n): 
        for j in xrange(i, n): 
            iters[j].next()

    return izip(*iters)