The preceding script uses the argparse module to take the user input and process the hostname, port, and timeout, which is how long our script will wait for the desired network service. It launches an instance of the NetServiceChecker class and calls the check() method. This method calculates the final end time of waiting and uses the socket's settimeout() method to control each round's end time, that is next_timeout. It then uses the socket's connect() method to test if the desired network service is available until the socket timeout occurs. This method also catches the socket timeout error and checks the socket timeout against the timeout values given by the user.