When I was learning python to do a small socket example, I found that the following problems would occur as long as sendall was used.

server_demo:

#!/usr/bin/env python # _*_coding:utf8_*_ import socket obj_socket = socket.socket() # 绑定端口 obj_socket.bind(('127.0.0.1', 9999)) # 设置最大连接数 obj_socket.listen(5) while True: # 阻塞等待客户端连接 conn, address = obj_socket.accept() print(address, conn) # 在python2.7中可以直接发送字符串，但是在python3中都是字节 obj_socket.sendall(bytes('你好', encoding='utf-8'))

client_demo:

#!/usr/bin/env python # _*_coding:utf8_*_ import socket obj_socket = socket.socket() obj_socket.connect(('127.0.0.1', 9999)) # 阻塞至服务器回复 最多接收1024bytes 如果超过会再次接收 res_bytes = obj_socket.recv(1024) res_str = str(res_bytes, encoding='utf-8') print(res_str) obj_socket.close()

I searched for many solutions, and I tried turning off the firewall, but it still didn't work.