python:
http://nbviewer.jupyter.org/github/lijin-THU/notes-python/blob/master/index.ipynb
https://github.com/lijin-THU/notes-python
https://www.hackerrank.com/challenges/30-hello-world/tutorial
&SQL
python&sql
原文：http://www.cnblogs.com/jojo123/p/6534269.html
