If you need to make a very simple command-line interface and it doesn't need to be friendly, you can read sys.argv to manually process the arguments coming into your program.
If you're trying to make a friendly command-line interface in Python, instead of manually parsing sys.argv you should probably use Python's argparse module.
How can you setup a main function in Python? And should you? Python doesn't know about main functions, but there's nothing stopping us from defining a function called main that we only call when running from the command-line.
A script or program is a .py file that's meant to be run directly. A module is a .py file that's meant to be imported by other .py files. Sometimes Python files are both modules and scripts.
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