code: def delete_tag(self, tags):
          
          if isinstance(tags, str):
              tags = [tags]
  
          evt = self._client._request_entity_tag_update(self.__lid, tags, delete=True)
          self._client._wait_and_except_if_failed(evt)
docs: Delete tags for a Thing in the language you specify. Case will be ignored and any tags matching lower-cased
          will be deleted.
  
          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 delete from your Thing, e.g.
          `["garden", "soil"]`