code: def command(*args, **kwargs):
      
      def decorator(f):
          if 'description' not in kwargs:
              kwargs['description'] = f.__doc__
          if 'parents' in kwargs:
              if not hasattr(f, '_argnames'):  # pragma: no cover
                  f._argnames = []
              for p in kwargs['parents']:
                  f._argnames += p._argnames if hasattr(p, '_argnames') else []
              kwargs['parents'] = [p.parser for p in kwargs['parents']]
          f.parser = argparse.ArgumentParser(*args, **kwargs)
          f.climax = True
          for arg in getattr(f, '_arguments', []):
              f.parser.add_argument(*arg[0], **arg[1])
  
          @wraps(f)
          def wrapper(args=None):
              kwargs = f.parser.parse_args(args)
              return f(**vars(kwargs))
  
          wrapper.func = f
          return wrapper
      return decorator
docs: Decorator to define a command.
  
      The arguments to this decorator are those of the
      `ArgumentParser <https://docs.python.org/3/library/argparse.html\
  #argumentparser-objects>`_
      object constructor.