python网络编程(4)

python网络编程

通过指定的端口号和协议获得服务名
如果想找到网络服务，就要知道该服务运行在tcp，udp的哪个端口上

import socketdef find_serv_name():    protocolname = 'tcp'    for each in [80,15]:        try:            print ("PORT: %s,PROTOCOL: %s,==>SERVER: %s" % (each,protocolname,socket.getservbyport(each,protocolname)))        except socket.error as err_msg:            print ("PORT: %s --- %s" %(each,err_msg))    print ("PORT: %s,PROTOCOL: %s, ==>SERVER: %s " % (53,'udp',socket.getservbyport(53,'udp')))if __name__ == '__main__':    find_serv_name()

socket.getservbyport(serv,proto) 找不到端口号在协议上对应的服务时
抛出socket.error异常