多线程socket客户端

import socket
from threading import Thread
import sys

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
port = input("port: ")
sock.connect(('localhost', port))

def reader():
    while 1:
        buf = sock.recv(1024)
        if buf:
            for b in buf: print hex(ord(b)),

def writer():
    while 1:
        buf = raw_input()
        sock.send(buf)


r=Thread(target=reader,args=())
w=Thread(target=writer,args=())
r.start()
w.start()