I think argparse works fine. What worries me is that it's also "soft-deprecated", because devs have said it should get no further development. I hope it stays around, because I use it by default as a no-dependencies solution that I know how it works.

If you aren't averse to using a third party package, on my personal projects I always found https://github.com/docopt/docopt to be nice.

You can kill 2 birds with one stone by documenting your scripts while also providing the argument structure / parsing.

Just last week I had to parse arguments again after a long time in a script of mine.

After some googling, getopt was chosen due to it's simplicity.