human
I wrote the below code

    def run_setup(event):
        'Delay    the    setup    until    Home    Assistant    is    fully    initialized.\n\n                                This    allows    any    entities    to    be    created    already\n                                '
        options = config.get(CONF_OPTIONS)
        if (options.get('units') is None):
            options['units'] = hass.config.units.name
        travel_mode = config.get(CONF_TRAVEL_MODE)
        mode = options.get(CONF_MODE)
        if (travel_mode is not None):
            wstr = 'Google    Travel    Time:    travel_mode    is    deprecated,    please    add    mode    to    the    options    dictionary    instead!'
            _LOGGER.warning(wstr)
            if (mode is None):
                options[CONF_MODE] = travel_mode
        titled_mode = options.get(CONF_MODE).title()
        formatted_name = '{}    -    {}'.format(DEFAULT_NAME, titled_mode)
        name = config.get(CONF_NAME, formatted_name)
        api_key = config.get(CONF_API_KEY)
        origin = config.get(CONF_ORIGIN)
        destination = config.get(CONF_DESTINATION)
        sensor = GoogleTravelTimeSensor(hass, name, api_key, origin, destination, options)
        if sensor.valid_api_connection:
            add_devices_callback([sensor])
    hass.bus.listen_once(EVENT_HOMEASSISTANT_START, run_setup)

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):