from socket import *from time import ctimeHOST = ''PORT = 9999BUFSIZ = 1024ADDR = (HOST, PORT)tcpSerSock = socket(AF_INET, SOCK_STREAM)  #創建套接字tcpSerSock.bind(ADDR)  #綁定IP和端口tcpSerSock.listen(5)  #監聽端口，最多5人排隊while True:  print('waiting for connection...')  tcpCliSock, addr = tcpSerSock.accept()  #建立連接  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() 

from socket import *HOST = '127.0.0.1' # or 'localhost'PORT = 9999BUFSIZ = 1024ADDR = (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()