import socket import select if __name__=="__main__":     s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)     s.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)     s.bind(("",20123))     s.listen(10)     epoll=select.epoll()     print s.fileno()     print select.EPOLLIN|select.EPOLLET     epoll.register(s.fileno(),select.EPOLLIN|select.EPOLLET)     while 1:         epoll_list=epoll.poll()         for fd,events in epoll_list:             print fd             print events             if fd==s.fileno():                 conn,addr=s.accept()                 print 123