When i try to create a webserver through a port throwing error

[pras120687]

No I mean i tried both the codes each one at a time but am able to create webserver on the port given but i am not able to shutdown the server. I used these commands server.server_close()
server.shutdown(). And also after closing the webserver how to end the process permanently on the port background because again i am not able to create the webserver to the same port i am getting exception.