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()
