iter_fetch

def iter_fetch(l=[], c=5):
    '''
        given a list, yield c number
        of items at a time.
    '''
    end=0
    start=0
    while True:
        if (end + c) >= len(l)-1:
            end = len(l)
        else:
            end += c

        yield l[start:end]

        if end >= len(l):
            break
        else:
            start = end