Python核心编程（第3版）第2章网络编程中关于tcp/udp服务器和客户端实现代码的运行出错的修正

在Python核心编程（第3版）第2章网络编程中，
关于tcp/udp服务器和客户端实现代码的运行会出现
【’str’ does not support the buffer interface】之类的错误，
现将自己学习过程中的修正代码粘贴如下：

【TCP服务器/客户端】

# TCP_server.py

from socket import *
from time import ctime

HOST = ''
PORT = 21567
BUFSIZ = 1024
ADDR = (HOST, PORT)

tcpSerSock = socket(AF_INET, SOCK_STREAM)
tcpSerSock.bind(ADDR)
tcpSerSock.listen(5)
i = 0

while True:
print('Waiting for connection...')
tcpCliSock, addr = tcpSerSock.accept()
print('...connected from:', addr)

while True:
data = tcpCliSock.recv(BUFSIZ).decode()
print(type(data))
print(type(data.encode()))
print(type(ctime()))
if not data:
i = 1
break
tcpCliSock.send(('[%s] %s' % (ctime(), data)).encode())

tcpCliSock.close()
if i == 1:
break
tcpSerSock.close()

# TCP_client.py

from socket import *

HOST = 'localhost'
PORT = 21567
BUFSIZ = 1024
ADDR = (HOST, PORT)

tcpCliSock = socket(AF_INET, SOCK_STREAM)
tcpCliSock.connect(ADDR)

while True:
print('Input something...')
data = input('>>>>>')
if not data:
break
tcpCliSock.send(data.encode())
data = tcpCliSock.recv(BUFSIZ).decode()
if not data:
break
print(data)

tcpCliSock.close()

【UDP服务器/客户端】

# UDP_server.py

from socket import *
from time import ctime

HOST = ''
PORT = 21567
BUFSIZ = 1024
ADDR = (HOST, PORT)

udpSerSock = socket(AF_INET, SOCK_DGRAM)
udpSerSock.bind(ADDR)

while True:
print('waiting for message...')
data, addr = udpSerSock.recvfrom(BUFSIZ)
if not data:
break
udpSerSock.sendto(('[%s] %s' % (ctime(), data.decode())).encode(), addr)
print('...received from and returned to:', addr)

udpSerSock.close()

# UDP_client.py

from socket import *
from time import ctime

HOST = 'localhost'
PORT = 21567
BUFSIZ = 1024
ADDR = (HOST, PORT)

udpCliSock = socket(AF_INET, SOCK_DGRAM)

while True:
print('Input something...')
data = input('>')
if not data:
break
udpCliSock.sendto(data.encode(), ADDR)
data, ADDR = udpCliSock.recvfrom(BUFSIZ)
if not data:
break
print(data.decode())

udpCliSock.close()