human
I wrote the below code

    from RFXtrx import SensorEvent
    sensors = []
    for (packet_id, entity_info) in config[CONF_DEVICES].items():
        event = rfxtrx.get_rfx_object(packet_id)
        device_id = ('sensor_' + slugify(event.device.id_string.lower()))
        if (device_id in rfxtrx.RFX_DEVICES):
            continue
        _LOGGER.info('Add    %s    rfxtrx.sensor', entity_info[ATTR_NAME])
        sub_sensors = {}
        data_types = entity_info[ATTR_DATA_TYPE]
        if (not data_types):
            data_types = ['']
            for data_type in DATA_TYPES:
                if (data_type in event.values):
                    data_types = [data_type]
                    break
        for _data_type in data_types:
            new_sensor = RfxtrxSensor(None, entity_info[ATTR_NAME], _data_type, entity_info[ATTR_FIREEVENT])
            sensors.append(new_sensor)
            sub_sensors[_data_type] = new_sensor
        rfxtrx.RFX_DEVICES[device_id] = sub_sensors
    add_devices_callback(sensors)
    def sensor_update(event):
        'Handle    sensor    updates    from    the    RFXtrx    gateway.'
        if (not isinstance(event, SensorEvent)):
            return
        device_id = ('sensor_' + slugify(event.device.id_string.lower()))
        if (device_id in rfxtrx.RFX_DEVICES):
            sensors = rfxtrx.RFX_DEVICES[device_id]
            for key in sensors:
                sensor = sensors[key]
                sensor.event = event
                if sensors[key].should_fire_event:
                    sensor.hass.bus.fire('signal_received', {ATTR_ENTITY_ID: sensors[key].entity_id})
            return
        if (not config[ATTR_AUTOMATIC_ADD]):
            return
        pkt_id = ''.join(('{0:02x}'.format(x) for x in event.data))
        _LOGGER.info('Automatic    add    rfxtrx.sensor:    %s', pkt_id)
        data_type = ''
        for _data_type in DATA_TYPES:
            if (_data_type in event.values):
                data_type = _data_type
                break
        new_sensor = RfxtrxSensor(event, pkt_id,...

What's a good function header?
 Here's a good function header?
assistant
#Here's a good function header.

def setup_platform(hass, config, add_devices_callback, discovery_info=None):