学习python twisted 的好文章
An Introduction to Asynchronous Programming and Twisted
Reference:
http://krondo.com/wp-content/uploads/2009/08/twisted-intro.html
twisted系列教程十七–用inlineCallbacks来管理callbacks
http://www.douban.com/note/232215099/
_inlineCallbacks详解
http://blog.csdn.net/xinghun_4/article/details/46834649