cut.py

def cache(iterable, count: int):
    """
    range(10), count=3 -> [0,1,2],[3,4,5],[6,7,8],[9]
    """
    assert(count > 0)
    saved = []
    index = 0
    for item in iterable:
        if index < count:
            saved.append(item)
            index += 1
        else:
            yield saved
            index = 1
            saved = [item]
    yield saved