code: def _operation_status_message(self):
      
      metadata = self._op['metadata']
      if not self._op['done']:
        if 'events' in metadata and metadata['events']:
          # Get the last event
          last_event = metadata['events'][-1]
  
          msg = last_event['description']
          ds = last_event['startTime']
        else:
          msg = 'Pending'
          ds = metadata['createTime']
      else:
        ds = metadata['endTime']
  
        if 'error' in self._op:
          msg = self._op['error']['message']
        else:
          msg = 'Success'
  
      return (msg, google_base.parse_rfc3339_utc_string(ds))
docs: Returns the most relevant status string and last updated date string.
  
      This string is meant for display only.
  
      Returns:
        A printable status string and date string.