This recipe relies on Python's built-in telnetlib networking library to create a telnet session. The run_telnet_session() function takes the username and password from the Command Prompt. The getpass module's getpass() function is used to get the password as this function won't let you see what is typed on the screen.

In order to create a telnet session, you need to instantiate a Telnet() class, which takes a hostname parameter to initialize. In this case, localhost is used as the hostname. You can use the argparse module to pass a hostname to this script.

The telnet session's remote output can be captured with the read_until() method. In the first case, the login prompt is detected using this method. Then, the username with a new line feed is sent to the remote machine by the write() method (in this case, the same machine accessed as if it's remote). Similarly, the password was supplied to the remote host.

Then, the ls command is sent to be executed. Finally, to disconnect from the remote host, the exit command is sent, and all session data received from the remote host is printed on screen using the read_all() method.