http://xael.org/pages/python-nmap-en.html nmap模块
http://www.tutorialspoint.com/python/python_multithreading.htm 多线程
http://www.cnblogs.com/tqsummer/archive/2011/01/25/1944771.html 多线程
http://python.jobbole.com/81546/ 多线程
http://blog.chinaunix.net/uid-27571599-id-3484048.html