Click is a Python package for creating beautiful command line interfaces in a composable way with as little code as necessary. It's the "Command Line Interface Creation Kit". It's highly configurable

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Hmm, I wonder how it compares to Traitlets? I got recommended that and it's taken me a while to learn, but it is very powerful. I'm just starting on a subcommand based app, so this is very relevant to me!

EDIT: Just glancing at the documentation I can see the docs are way better!
- Traitlets
  
  Click is a library to make a CLI - e.g.
  
  """echo.py""" @click.command() @click.arg("foo") def echo(foo): print(foo) if __main__: echo()
  
  python ./echo.py "Hello World"
  
  vs Traitlets looks like a (really cool) type validation library? Pydantic is similar
  
  Traitlets also supports subcommands, command line arguments, etc. At its heart though, it's more of a configuration library.
  
  (I'm very much still a novice coder so definitely take that into account lol!)
  
  https://traitlets.readthedocs.io/en/stable/config.html#command-line-arguments
Click is awesome, I use it all the time for small and medium sized python projects!