How to use the cflib.crazyflie.mem.MemoryElement.TYPE_DRIVER_LED function in cflib

def _connected(self, link_uri):
        """Callback when the Crazyflie has been connected"""
        mems = self._helper.cf.mem.get_mems(MemoryElement.TYPE_DRIVER_LED)
        if len(mems) > 0:
            self._mem = mems[0]
            logger.info(self._mem)

        if self._mem:
            for btn in self._btns:
                btn.setEnabled(True)
                btn.setStyleSheet("background-color: black")
                self._intensity_slider.setEnabled(True)
                self._intensity_spin.setEnabled(True)

def _cmd_callback(self, data):
        """Called when new data arrives via ZMQ"""
        if len(self._cf.mem.get_mems(MemoryElement.TYPE_DRIVER_LED)) > 0:
            logger.info("Updating memory")
            memory = self._cf.mem.get_mems(MemoryElement.TYPE_DRIVER_LED)[0]
            for i_led in range(len(data["rgbleds"])):
                memory.leds[i_led].set(data["rgbleds"][i_led][0],
                                       data["rgbleds"][i_led][1],
                                       data["rgbleds"][i_led][2])
            memory.write_data(self._write_cb)

self._update_ui_state()

        Config().set("link_uri", str(self._selected_interface))

        lg = LogConfig("Battery", 1000)
        lg.add_variable("pm.vbat", "float")
        lg.add_variable("pm.state", "int8_t")
        try:
            self.cf.log.add_config(lg)
            lg.data_received_cb.add_callback(self.batteryUpdatedSignal.emit)
            lg.error_cb.add_callback(self._log_error_signal.emit)
            lg.start()
        except KeyError as e:
            logger.warning(str(e))

        mems = self.cf.mem.get_mems(MemoryElement.TYPE_DRIVER_LED)
        if len(mems) > 0:
            mems[0].write_data(self._led_write_done)

def _cmd_callback(self, data):
        """Called when new data arrives via ZMQ"""
        if len(self._cf.mem.get_mems(MemoryElement.TYPE_DRIVER_LED)) > 0:
            logger.info("Updating memory")
            memory = self._cf.mem.get_mems(MemoryElement.TYPE_DRIVER_LED)[0]
            for i_led in range(len(data["rgbleds"])):
                memory.leds[i_led].set(data["rgbleds"][i_led][0],
                                       data["rgbleds"][i_led][1],
                                       data["rgbleds"][i_led][2])
            memory.write_data(self._write_cb)

self._update_ui_state()

        Config().set("link_uri", str(self._selected_interface))

        lg = LogConfig("Battery", 1000)
        lg.add_variable("pm.vbat", "float")
        lg.add_variable("pm.state", "int8_t")
        try:
            self.cf.log.add_config(lg)
            lg.data_received_cb.add_callback(self.batteryUpdatedSignal.emit)
            lg.error_cb.add_callback(self._log_error_signal.emit)
            lg.start()
        except KeyError as e:
            logger.warning(str(e))

        mems = self.cf.mem.get_mems(MemoryElement.TYPE_DRIVER_LED)
        if len(mems) > 0:
            mems[0].write_data(self._led_write_done)