python核心编程(第三版)网络编程错

//服务器端代码
from socket import *
from time import ctime

host='localhost'
port=3330
bufsize = 1024
addr = (host,port)

tcpser = socket(AF_INET,SOCK_STREAM)
tcpser.bind(addr)
tcpser.listen(5)

while True:
    print('waiting for connetion....')
    tcpCliSock,ADDR = tcpser.accept()
    print('...connection from:',ADDR)

    while True:
        data = tcpCliSock.recv(bufsize)
        if not data:
            break
        tcpCliSock.send(('[%s]%s'%(ctime(),data)).encode())

    tcpCliSock.close()
tcpser.close()

//客户端代码
from socket import *


host='localhost'
port=3330
bufsize = 1024
addr = (host,port)

tcpser = socket(AF_INET,SOCK_STREAM)
tcpser.connect(addr)

while True:
    data = input('>')
    if not data:
        break
    tcpser.send(data.encode())
    data = tcpser.recv(bufsize).decode()
    if not data:
        break
    print(data)

tcpser.close()