def METHOD_NAME(self):
    if self.is_psu_fan is True:
        data = self.__read_attr_file(
            self.attr_path + 'psu{}_prnt'.format(self.index))
        return data == '1'
    ret = self.__read_attr_file(
        self.attr_path + 'fan{}_present'.format(self.index))
    return ret == '1'