I love that! Argparse is such an old and boring solution to such a simple problem that we need more like this. And I have hope that one of the solutions will make it into the standard library at some point.

There are some others like yours:

Google's python-fire (1)

Docopt (2), which creates the cli from the documentation instead of the other way around

Click (3)

And my own commandeer (4)

Typer (5)

(1) https://github.com/google/python-fire (2) http://docopt.org/ (3) https://click.palletsprojects.com/en/8.0.x/ (4) https://pythonhosted.org/Commandeer/index.html (5) https://typer.tiangolo.com/