对应的代码：
服务端：
import socket phone = socket.socket(socket.AF_INET,socket.SOCK_STREAM) #买手机
phone.bind(('127.0.0.1',8000))#绑定手机卡 phone.listen(5)#开机
print('——>')
conn,addr = phone.accept()# 等电话 msg = conn.recv(1024) #收消息
print('客户端发来的消息是：',msg)
conn.send(msg.upper())#发消息 conn.close() #挂电话
phone.close() #关机
服务端
客户端：
import socket
phone = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
phone.connect(('127.0.0.1',8000))
phone.send('hello,this is the first netprogram'.encode('utf-8'))
data = phone.recv(1024)
print('收到从服务端发来的消息：',data)
客户端