How to use the alexapy.AlexaAPI.get_last_device_serial function in AlexaPy

def update_last_called(login_obj, last_called=None):
        """Update the last called device for the login_obj.

        This will store the last_called in hass.data and also fire an event
        to notify listeners.
        """
        from alexapy import AlexaAPI
        if last_called:
            last_called = last_called
        else:
            last_called = AlexaAPI.get_last_device_serial(login_obj)
        _LOGGER.debug("%s: Updated last_called: %s",
                      hide_email(email),
                      hide_serial(last_called))
        stored_data = hass.data[DATA_ALEXAMEDIA]['accounts'][email]
        if (('last_called' in stored_data and
             last_called != stored_data['last_called']) or
                ('last_called' not in stored_data and
                 last_called is not None)):
            _LOGGER.debug("%s: last_called changed: %s to %s",
                          hide_email(email),
                          hide_serial(stored_data['last_called'] if
                                      'last_called' in stored_data else None),
                          hide_serial(last_called))
            hass.bus.fire(('{}_{}'.format(DOMAIN, hide_email(email)))[0:32],
                          {'last_called_change': last_called})
        (hass.data[DATA_ALEXAMEDIA]

def update_last_called(login_obj, last_called=None):
        """Update the last called device for the login_obj.

        This will store the last_called in hass.data and also fire an event
        to notify listeners.
        """
        from alexapy import AlexaAPI
        if last_called:
            last_called = last_called
        else:
            last_called = AlexaAPI.get_last_device_serial(login_obj)
        _LOGGER.debug("%s: Updated last_called: %s",
                      hide_email(email),
                      hide_serial(last_called))
        stored_data = hass.data[DATA_ALEXAMEDIA]['accounts'][email]
        if (('last_called' in stored_data and
             last_called != stored_data['last_called']) or
                ('last_called' not in stored_data and
                 last_called is not None)):
            _LOGGER.debug("%s: last_called changed: %s to %s",
                          hide_email(email),
                          hide_serial(stored_data['last_called'] if
                                      'last_called' in stored_data else None),
                          hide_serial(last_called))
            hass.bus.fire(('{}_{}'.format(DOMAIN, hide_email(email)))[0:32],
                          {'last_called_change': last_called})
        (hass.data[DATA_ALEXAMEDIA]

async def update_last_called(login_obj, last_called=None):
        """Update the last called device for the login_obj.

        This will store the last_called in hass.data and also fire an event
        to notify listeners.
        """
        from alexapy import AlexaAPI

        if not last_called:
            last_called = await AlexaAPI.get_last_device_serial(login_obj)
        _LOGGER.debug(
            "%s: Updated last_called: %s", hide_email(email), hide_serial(last_called)
        )
        stored_data = hass.data[DATA_ALEXAMEDIA]["accounts"][email]
        if (
            "last_called" in stored_data and last_called != stored_data["last_called"]
        ) or ("last_called" not in stored_data and last_called is not None):
            _LOGGER.debug(
                "%s: last_called changed: %s to %s",
                hide_email(email),
                hide_serial(
                    stored_data["last_called"] if "last_called" in stored_data else None
                ),
                hide_serial(last_called),
            )
            async_dispatcher_send(

async def update_last_called(login_obj, last_called=None):
        """Update the last called device for the login_obj.

        This will store the last_called in hass.data and also fire an event
        to notify listeners.
        """
        from alexapy import AlexaAPI

        if not last_called:
            last_called = await AlexaAPI.get_last_device_serial(login_obj)
        _LOGGER.debug(
            "%s: Updated last_called: %s", hide_email(email), hide_serial(last_called)
        )
        stored_data = hass.data[DATA_ALEXAMEDIA]["accounts"][email]
        if (
            "last_called" in stored_data and last_called != stored_data["last_called"]
        ) or ("last_called" not in stored_data and last_called is not None):
            _LOGGER.debug(
                "%s: last_called changed: %s to %s",
                hide_email(email),
                hide_serial(
                    stored_data["last_called"] if "last_called" in stored_data else None
                ),
                hide_serial(last_called),
            )
            async_dispatcher_send(

async def update_last_called(login_obj, last_called=None):
        """Update the last called device for the login_obj.

        This will store the last_called in hass.data and also fire an event
        to notify listeners.
        """
        from alexapy import AlexaAPI
        if last_called:
            last_called = last_called
        else:
            last_called = await AlexaAPI.get_last_device_serial(login_obj)
        _LOGGER.debug("%s: Updated last_called: %s",
                      hide_email(email),
                      hide_serial(last_called))
        stored_data = hass.data[DATA_ALEXAMEDIA]['accounts'][email]
        if (('last_called' in stored_data and
             last_called != stored_data['last_called']) or
                ('last_called' not in stored_data and
                 last_called is not None)):
            _LOGGER.debug("%s: last_called changed: %s to %s",
                          hide_email(email),
                          hide_serial(stored_data['last_called'] if
                                      'last_called' in stored_data else None),
                          hide_serial(last_called))
            hass.bus.async_fire(
                ('{}_{}'.format(DOMAIN,
                                hide_email(email)))[0:32],

async def update_last_called(login_obj, last_called=None):
        """Update the last called device for the login_obj.

        This will store the last_called in hass.data and also fire an event
        to notify listeners.
        """
        from alexapy import AlexaAPI
        if not last_called:
            last_called = await AlexaAPI.get_last_device_serial(login_obj)
        _LOGGER.debug("%s: Updated last_called: %s",
                      hide_email(email),
                      hide_serial(last_called))
        stored_data = hass.data[DATA_ALEXAMEDIA]['accounts'][email]
        if (('last_called' in stored_data and
             last_called != stored_data['last_called']) or
                ('last_called' not in stored_data and
                 last_called is not None)):
            _LOGGER.debug("%s: last_called changed: %s to %s",
                          hide_email(email),
                          hide_serial(stored_data['last_called'] if
                                      'last_called' in stored_data else None),
                          hide_serial(last_called))
            hass.bus.async_fire(
                f'{DOMAIN}_{hide_email(email)}'[0:32],
                {'last_called_change': last_called})