code: def create_tag(self, tags):
          
          if isinstance(tags, str):
              tags = [tags]
  
          evt = self._client._request_entity_tag_update(self.__lid, tags, delete=False)
          self._client._wait_and_except_if_failed(evt)
docs: Create tags for a Thing in the language you specify. Tags can only contain alphanumeric (unicode) characters
          and the underscore. Tags will be stored lower-cased.
  
          Raises [IOTException](./Exceptions.m.html#IoticAgent.IOT.Exceptions.IOTException)
          containing the error if the infrastructure detects a problem
  
          Raises [LinkException](../Core/AmqpLink.m.html#IoticAgent.Core.AmqpLink.LinkException)
          if there is a communications problem between you and the infrastructure
  
          `tags` (mandatory) (list) - the list of tags you want to add to your Thing, e.g.
          `["garden", "soil"]`