python socket tcpサーバとクライアントの作成

1. server

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)

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

    while True:
        data = tcpCliSock.recv(BUFSIZ)
        if not data:
            break
        content = '[%s] %s' % (bytes(ctime(), "utf-8"), data)
        print(data)
        print(type(content))
        tcpCliSock.send(content.encode("utf-8"))

    tcpCliSock.close()

tcpSerSock.close()

2.client

from socket import *
HOST = "127.0.0.1"
PORT = 21567
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("utf8"))
    data = tcpCliSock.recv(BUFSIZ)
    if not data:
        break
    print(data.decode("utf-8"))

tcpCliSock.close()