[迭代器(iterator)和生成器(generator)的关系](%E8%BF%AD%E4%BB%A3%E5%99%A8(iterator)%E5%92%8C%E7%94%9F%E6%88%90%E5%99%A8(generator)%E7%9A%84%E5%85%B3%E7%B3%BB.md)