How to make your Python programs more interactive (cli arguments)

Heys PyLadies and PyGents,
let's meet for another simple and basic session in Python. We'll learn how to use the argparse module in Python. It's meant to read some arguments from the user and use those inside the program. 
Ex. python count_something.py --sum 2 3
Here the --sum is an argument, as well as 2 and 3.