def print_machine_info():

     host_name = socket.gethostname();

     ip_address = socket.gethostbyname(host_name)

     print ('host_name : ',host_name)

     print (host_name,'\'IP : ',ip_address)

 def get_remote_machine_info(remote_host):

     try:

         ip_address = socket.gethostbyname(remote_host)

         print (remote_host,'\'IP : ',ip_address)

     except (socket.error) as err_msg:

         print (remote_host,err_msg)

 def find_service_name():

     for port in [80,25,53,22]:

         service = socket.getservbyport(port)

         print (service)

 def test_socket_timeout():

     s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)

     print (s.gettimeout())

     s.settimeout(20)

     print (s.gettimeout())