Python create custom command line interface cli

creating a custom command line interface (cli) in python can be very useful for building interactive command-line applications. this allows users to interact with your program using commands they type into the terminal. we can achieve this using the built-in `argparse` module in python, which helps in parsing command-line arguments.

here are the steps to create a custom cli in python:

1. import the `argparse` module.
2. define the cli parser and add arguments.
3. parse the arguments provided by the user.
4. implement the logic based on the provided arguments.

below is an example of a simple python script that creates a custom cli:

in this example, we define a `main` function that performs the arithmetic operations based on the provided arguments. we then use the `argparse` module to define three command-line arguments: `operation`, `num1`, and `num2`. the `choices` parameter restricts the `operation` argument to only accept 'add' or 'subtract'.

this command will add the numbers 5 and 3 and print the result.

by following this tutorial, you can create a custom cli in python for your specific use case, allowing users to interact with your program via the command line.

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