from socket import *from time import ctimeHOST = ''PORT = 21567BUFSIZE = 1024ADDR = (HOST, PORT)tcpSerSock = socket(AF_INET, SOCK_STREAM)tcpSerSock.bind(ADDR)tcpSerSock.listen(5)quit = Falseshutdown = Falsewhile True:  print('waiting for connection...')  tcpCliSock, addr = tcpSerSock.accept()  print('...connected from: ', addr)  while True:    data = tcpCliSock.recv(BUFSIZE)    data = data.decode('utf8')    if not data:      break    ss = '[%s] %s' %(ctime(), data)    tcpCliSock.send(ss.encode('utf8'))    print(ss)    if data == 'bye':      quit = True      break    elif data == 'shutdown':      shutdown = True      break  print('Bye-bye: [%s: %d]' %(addr[0], addr[1]))  tcpCliSock.close()  if shutdown:    breaktcpSerSock.close()print('Server has been

from socket import *HOST = 'localhost'PORT = 21567BUFSIZE = 1024ADDR = (HOST, PORT)tcpCliSock = socket(AF_INET, SOCK_STREAM)tcpCliSock.connect(ADDR)while True:  data = input('>')  if not data:    continue  print('input data: [%s]' %data)  tcpCliSock.send(data.encode('utf8'))  rdata = tcpCliSock.recv(BUFSIZE)  if not rdata:    break  print(rdata.decode('utf8'))  if data == 'bye' or data == 'shutdown':    breaktcpCliSock.close()