关于socket客户端接收不定长数据的解决方案

#!/usr/bin/env python3.5
# -*-coding:utf8-*-
"""
本实例客户端用于不断接收不定长数据，存储到变量res
"""
import socket,time
ip_port = ('192.168.1.189',1888)
sk = socket.socket()
sk.connect(ip_port)
sk.setblocking(0) # 非阻塞模式，当接收没有发现任何数据时出异常
while True:
    user_input=input("cmd>>:").strip()
    if len(user_input) ==0:continue
    if user_input =="q":break
    sk.send(bytes(user_input,'utf8'))
    res = ""
    while True:
        try:
            time.sleep(0.1)
            server_replay = sk.recv(8000)
            res += str(server_replay,"utf8")
        except BlockingIOError:
            break
    print(res)
    res = ""
sk.close()