code: def cacheable_object(cls):
      
  
      def reset(self):
          if hasattr(self, '_resettable_cached_properties'):
              self._resettable_cached_properties = {}
  
      cls.reset = reset
      return cls
docs: Decorator to add a reset() method that clears data cached by
      the @resettable_cached_property decorator. Technically this could
      be a mixin...