python协程

1、http://www.dongwm.com/old/archives/guanyugeventdeyixielijieer/

2、https://amberno1111.github.io/2016/11/02/Python/Python%E5%8D%8F%E7%A8%8B%E4%B8%8E%E5%BC%82%E6%AD%A5%E5%B9%B6%E5%8F%91/

3、https://thief.one/2017/02/20/Python%E5%8D%8F%E7%A8%8B/