python collections http://www.cnblogs.com/goodspeed/archive/2012/08/06/python_collections.html
Django 发邮件 http://www.i-alive.com/post/23/
PyCharm添加自定义路径 http://www.g2w.me/2012/10/pycharm-setup-package-path/
python exec eval execfile http://blog.csdn.net/cogbee/article/details/24346799
原文：http://www.cnblogs.com/flowjacky/p/4555241.html