I really do like argparse.

It will cleanly do just about anything you need done, including nice stuff like long/short options, default values, required options, types like type=int, help for every option, and even complicated stuff like subcommands.

And the namespace stuff is clever, so you can reference arg.debug instead of arg['debug']

I always found argparse did argument parsing well enough but it felt clunky when you need something more complicated like lots of subcommands. I find myself using it exclusively when I'm trying to avoid dependencies outside the Python standard library.

My choice of argument parsing in Python is Click. It has next to no rough edges and it's a breath of fresh air compared to argparse. I recently recommended it to a colleague who fell in love with it with minimal persuasion from me. I recommend it highly.

[1] https://click.palletsprojects.com/en/7.x/

Also, it's not Python but in Nim there is https://github.com/c-blake/cligen which also does spellcheck/typo suggestions, and allows --kebab-case --camelCase or --snake_case for long options, among other bells & whistles.