code: def del_downtime(self, downtime_id):
          
          if downtime_id in self.downtimes:
              self.downtimes[downtime_id].can_be_deleted = True
              del self.downtimes[downtime_id]
docs: Delete a downtime in this object
  
          :param downtime_id: id of the downtime to delete
          :type downtime_id: int
          :return: None