import socket

 def find_service_name():

     protocolname = 'tcp'

     for port in [80, 25]:

         print("Port: %s => service name: %s" % (port, socket.getservbyport(port, protocolname)))

     print("Port: %s => service name: %s" % (53, socket.getservbyport(53, 'udp')))

 if __name__ == '__main__':

     find_service_name()

 Port: 80 => service name: http

 Port: 25 => service name: smtp

 Port: 53 => service name: domain

 def getservbyport(port, protocolname=None): # real signature unknown; restored from __doc__

     """

     getservbyport(port[, protocolname]) -> string

     Return the service name from a port number and protocol name.

     The optional protocol name, if given, should be 'tcp' or 'udp',

     otherwise any protocol will match.

     """

     return

 # 获取对应端口的服务名