Network automation use case

As we have now interacted with multiple sections of Python and device interaction, let's create a use case to incorporate what we have learned so far. The use case is as follows:

Log into the router and fetch some information:

1. task1(): Show the version, show the IP in brief, show the clock, and show the configured usernames on the router.
2. task2(): Create another username on the test router with the password test and check whether we can log in successfully with the newly created username.
3. task3(): Log in with the newly created username test, and delete all the other usernames from the running-config. Once this is done, return all the current usernames configured on the router to confirm whether only the test username is configured on the router.

Let's build a script to tackle these tasks one by one:

from netmiko import ConnectHandler

device = ConnectHandler(device_type='cisco_ios', ip='192.168.255.249', username='cisco', password='cisco')

def task1():
    output ...