Iterable segregator

segregator.py

from itertools import chain, tee, izip


# A
def pairwise(iterable):
    "s -> (s0,s1), (s1,s2), (s2, s3), ..."
    a, b = tee(iterable)
    next(b, None)
    return izip(a, b)
    
arr = range(100)
step = 7

# [0, 1, 2, 3, ... 99] -> [(0, 7), (7, 14), ..., (98, 100)]
pairwise(chain(xrange(0, len(arr), step), (len(arr), )))


# B
izip(xrange(0, 90, 10), xrange(10, 100, 10))


# C
(arr[i:i + 10] for i in xrange(0, 100, 10))