Python 自省指南
http://www.ibm.com/developerworks/cn/linux/l-pyint/
Python自省(反射)指南
http://www.cnblogs.com/huxi/archive/2011/01/02/1924317.html
python - 动态加载模块和类
http://www.cnblogs.com/huangjacky/archive/2012/08/22/2650878.html