Chunkify your iterable.

chunky.py

"""
Chunk a sequence similar to the itertools grouper recipe, but without the filler.

>>> list(chunky(range(10), 0))
[]

>>> list(chunky(range(10), 1))
[(0,), (1,), (2,), (3,), (4,), (5,), (6,), (7,), (8,), (9,)]

>>> list(chunky(range(10), 5))
[(0, 1, 2, 3, 4), (5, 6, 7, 8, 9)]

>>> list(chunky(range(10), 10))
[(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)]
"""
from itertools import islice

def chunky(sequence, n=None):
    iterable = iter(sequence)
    next_group = tuple(islice(iterable, n))
    while next_group:
        yield next_group
        next_group = tuple(islice(iterable, n))

if __name__ == "__main__":
    import doctest
    doctest.testmod()