In this chapter, we will take a look at how we can use the argparse module to create easy to use command line interfaces (CLIs). CLIs can provide a much easier way to develop interface for your applications and are appropriate for situations where a graphical interface is not necessarily required.

To demonstrate the use of the module, we will build a simple unit conversion application that allows the user to input a value in a given unit and have the program convert it to a set of different units.