A iterator that converts single sequence into iterable of lists length n.

iterutils.py

def in_batches(sequence, n=2):
    """
    >>> list(in_batches([1, 2, 3, 4, 5], n=2))
    [[1, 2], [3, 4], [5, None]]
    """
    iterable = iter(sequence)
    try:
        while True:
            values = [None] * n
            for i in xrange(n):
                values[i] = iterable.next()
            yield values
    except StopIteration:
        if values[0] is not None:
            yield values