关于 python3 Socket.send bytes-Obj 问题

在翻阅学习《python核心编程 第三版》 的过程中,在敲书中代码时, 发现server端一直报错:

a bytes-like object is required, not ‘str’

查询关键词时, 看到一个博客做出了一些解释

调整代码如下:

server:

# -*- coding: utf-8 -*-
# python3

# author:       
# time:
# 

# 判断版本使用print

from __future__ import print_function
from socketserver import (TCPServer as TCP, StreamRequestHandler as SRH)
from time import ctime


# 继承处理类,并实现处理函数
class MyRequestHandle(SRH):
    # 实现处理函数
    def handle(self):
        print('...connected from:', self.client_address)

        # 因为python3的 socket send 只发送 bytes 则 recv也仅为bytes
        strData = self.rfile.readline()
        #strData = self.request.recv(1024).strip()


        # 查看收到数据的类型 ,并转换类型
        print(type(strData))
        if isinstance(strData, bytes):
            strData = strData.decode('utf-8')

            # print(type(strData))
            # print(strData)
            # print(type(strC))
            # print(strC)

        # 如果接收的不是Str类型, 则返回默认字符串
        if not isinstance(strData, str):
            strData = "Server Recv String Error!"

        self.wfile.write(bytes('[%s] %s' % (ctime(), strData), 'utf-8'))

def main():
    HOST = ''
    PORT = 21567
    ADDR = (HOST, PORT)

    # 实例一个TCP Socket对象, 并设置 目标 和 处理对象
    tcpServ = TCP(ADDR, MyRequestHandle)
    print("Waiting for Connecting...")

    # 启动服务器循环
    tcpServ.serve_forever()


if __name__ == "__main__":
    main()

client:

# -*- coding: utf-8 -*-
# python3

# author:       
# time:
# 

# 判断版本使用print

from __future__ import print_function
import socket
#from socketserver import (TCPServer as TCP, StreamRequestHandler as SRH)
from time import ctime


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

    while True:
        tcpClientSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        tcpClientSocket.connect(ADDR)
        data = input('>')
        if not data:
            break
        print(type(data))

        # python3中 send函数 仅接收 bytes类型的数据, 所以发送之前需要转换
        tcpClientSocket.send(bytes('%s\r\n' % data, 'utf-8'))
        data = tcpClientSocket.recv(BUFSIZ)
        if not data:
            break
        print(data.strip().decode('utf-8'))
        tcpClientSocket.close()


if __name__ == "__main__":
    main()

目前对 str和bytes的 decode 和 encode还不是太理解

插入一张图片作为说明: