code: def start_timer(self):
          
          if self.container.enabled:
              self._start_time = time.time()
              if not self._stat_start_time:
                  self._stat_start_time = self._start_time
docs: This is a low-level method that is called by pywbem at the begin of an
          operation. It starts the measurement for that operation, if statistics
          is enabled for the connection.
  
          A subsequent invocation of :meth:`~pywbem.OperationStatistic.stop_timer`
          will complete the measurement for that operation and will update the
          statistics data.