def chunks(iterable, length=2, fill=False, filler=None, drop_incomplete=True):
    """Iterate through iterable in chunks"""
    iterable = iter(iterable)
    while True:
        data = tuple(itertools.islice(iterable, length))
        if len(data) == length:
            yield data
        else:
            if fill:
                data += tuple(filler for _ in xrange(length - len(data)))
                yield data
            elif not drop_incomplete:
                yield data
            return