Python Socket TypeError: a bytes-like object is required, not 'str' 错误提示

《python核心编程》第三版,发现示例2-1代码返回错误

发现这里python3.5和Python2.7在套接字返回值解码上有区别。

先介绍一下 python bytes和str两种类型转换的函数encode(),decode()

str通过encode()方法可以编码为指定的bytes

反过来，如果我们从网络或磁盘上读取了字节流，那么读到的数据就是bytes。要把bytes变为str，就需要用decode()方法：

修正后：

tcp服务器

from socket import *

from time import ctime

HOST = ''

PORT = 22222

ADDR = (HOST, PORT)

BUFSIZ = 1024

tcpSerSock = socket(AF_INET, SOCK_STREAM)

tcpSerSock.bind(ADDR)

tcpSerSock.listen(5)

while True:

print('waiting for connection...')

tcpCliSock, addr = tcpSerSock.accept()

print('...connected from: ', addr)

while True:

data = tcpCliSock.recv(BUFSIZ).decode()

if not data:

break

tcpCliSock.send(('[%s] %s' %(ctime(),data)).encode())

tcpCliSock.close()

tcpSerSock.close()

tcp客户端：

from socket import *

HOST = '127.0.0.1'

PORT = 22222

BUFSIZ = 1024

ADDR = (HOST, PORT)

tcpCliSock = socket(AF_INET, SOCK_STREAM)

tcpCliSock.connect(ADDR)

while True:

data = input('> ')

if not data:

break

tcpCliSock.send(data.encode('utf-8'))

data = tcpCliSock.recv(BUFSIZ)

if not data:

break

print(data.decode('utf-8'))

tcpCliSock.close()