I'm not sure why click is often recommended. I've used argh for years and find it easier:

  def hello(name):
      return "hello {}".format(name)
  
  def ping():
      return "pong"

  if __name__ == "__main__":
      import argh
      parser = argh.ArghParser()
      parser.add_commands([hello, ping])
      parser.dispatch()