'Return the calculator for the given `counter_type`.
Fallback with `get_raw`.'

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
