code: def option(*param_decls, **attrs):
      
      def decorator(f):
          _param_memo(f, GandiOption(param_decls, **attrs))
          return f
      return decorator
docs: Attach an option to the command.
  
      All positional arguments are passed as parameter declarations
      to :class:`Option`, all keyword arguments are forwarded unchanged.
      This is equivalent to creating an :class:`Option` instance manually and
      attaching it to the :attr:`Command.params` list.