Study notes
02/18/2016-5/6/2016
https://www.gitbook.com/book/wzzlj/wzzljomooc2py/details
http://www.chengweiyang.cn/gitbook/index.html#gitbook-
https://www.gitbook.com/book/jeremiahzhang/omooc2py/details
https://www.gitbook.com/book/jeremiahzhang/pybeginner/details