code: def argument(*args, **kwargs):
      
      def decorator(f):
          if not hasattr(f, '_arguments'):
              f._arguments = []
          if not hasattr(f, '_argnames'):
              f._argnames = []
          f._arguments.append((args, kwargs))
          f._argnames.append(_get_dest(*args, **kwargs))
          return f
      return decorator
docs: Decorator to define an argparse option or argument.
  
      The arguments to this decorator are the same as the
      `ArgumentParser.add_argument <https://docs.python.org/3/library/\
  argparse.html#the-add-argument-method>`_
      method.