code: def _get_property_calculator(self, counter_type):
          
          calculator = get_raw
          try:
              calculator = get_calculator(counter_type)
          except UndefinedCalculator:
              self.logger.warning(
                  u"Undefined WMI calculator for counter_type {counter_type}."
                  " Values are reported as RAW.".format(counter_type=counter_type)
              )
  
          return calculator
docs: Return the calculator for the given `counter_type`.
          Fallback with `get_raw`.