code: def add_labels(self, *args):
          
          url = self._build_url('labels', base_url=self._api)
          json = self._json(self._post(url, data=args), 200)
          return [Label(l, self) for l in json] if json else []
docs: Add labels to this issue.
  
          :param str args: (required), names of the labels you wish to add
          :returns: list of :class:`Label`\ s