code: def _format_property_values(self, previous, current):
          
          formatted_wmi_object = CaseInsensitiveDict()
  
          for property_name, property_raw_value in iteritems(current):
              counter_type = self._property_counter_types.get(property_name)
              property_formatted_value = property_raw_value
  
              if counter_type:
                  calculator = self._get_property_calculator(counter_type)
                  property_formatted_value = calculator(previous, current, property_name)
  
              formatted_wmi_object[property_name] = property_formatted_value
  
          return formatted_wmi_object
docs: Format WMI Object's RAW data based on the previous sample.
  
          Do not override the original WMI Object !