code: def name_from_class(cls, measurement_class):
          
          if not getattr(cls, '_measurements_initialized', False):
              cls._measurement_map = dict((m.name, m) for m in all_measurements())
              cls._measurements_initialized = True
  
          try:
              name = getattr(measurement_class, 'name')
          except AttributeError:
              raise UnrecognizedMeasurementError("No 'name' attribute in %s" %
                      measurement_class)
          else:
              cls._measurement_map[name] = measurement_class
              return name
docs: For a given measurement class, return its generic name.
  
          The given class is expected to have a ``name`` attribute, otherwise this
          function will raise an execption. The point of using this method instead
          of just trying to grab that attribute in the application is to cache
          measurement name to class mappings for future use.
  
          Returns:
              the generic OpenXC name for a measurement class.
  
          Raise:
              UnrecognizedMeasurementError: if the class does not have a valid
                  generic name