This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
此份代码仅用作学术交流用途，其他行为带来的后果本人概不负责
This copy of code is for study of python only
2015-9-21: add user traffic management function
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
此份代码仅用作学术交流用途，其他行为带来的后果本人概不负责
This copy of code is for study of python only
2015-9-21: add user traffic management function