def save(self):
        tmp_path = self.path + '.tmp'
        with open(tmp_path, 'w') as f:
            f.write(json.dumps(self.body_labels.items()))
        os.rename(tmp_path, self.path)
def __notify(self):
        if self.__observer is not None:
            self.__observer.notify(self.__means, self.__variances, self.__clusters)