code: def set_maintainer(self, maintainer):
          # type: (Union[hdx.data.user.User,Dict,str]) -> None
          
          if isinstance(maintainer, hdx.data.user.User) or isinstance(maintainer, dict):
              if 'id' not in maintainer:
                  maintainer = hdx.data.user.User.read_from_hdx(maintainer['name'], configuration=self.configuration)
              maintainer = maintainer['id']
          elif not isinstance(maintainer, str):
              raise HDXError('Type %s cannot be added as a maintainer!' % type(maintainer).__name__)
          if is_valid_uuid(maintainer) is False:
              raise HDXError('%s is not a valid user id for a maintainer!' % maintainer)
          self.data['maintainer'] = maintainer
docs: Set the dataset's maintainer.
  
           Args:
               maintainer (Union[User,Dict,str]): Either a user id or User metadata from a User object or dictionary.
           Returns:
               None