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Python-based iterators and generators

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Iterators 
作用:不依靠索引遍历,可遍历无索引对象特性:分批次取值,比有索引对象更节省内存缺点:无法获取迭代器的长度    使用不如列表索引灵活    一次性的,只能从头到尾取值判断:只要本身有__iter__方法,就是可迭代的try :               #异常退出,for 循环自带检测    dadadaexcept StopIteration:    break
Generator 
简单定义:生成器就是一个函数 包含 yield 语句特性:分步运行函数,能够保存函数当前状态与return的区别 :return 只能返回一次,yield可以返回多次值
Yield 
把函数变成生成器(生成器本身也是迭代器)用yield 可以返回多次函数在暂停以及下一次继续下一次运行状态有yield保存

Python-based iterators and generators

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