human
I wrote the below code

    from pynuki import NukiBridge
    bridge = NukiBridge(config.get(CONF_HOST), config.get(CONF_TOKEN))
    add_devices([NukiLock(lock) for lock in bridge.locks])
    def service_handler(service):
        'Service    handler    for    nuki    services.'
        entity_ids = extract_entity_ids(hass, service)
        all_locks = hass.data[NUKI_DATA][DOMAIN]
        target_locks = []
        if (not entity_ids):
            target_locks = all_locks
        else:
            for lock in all_locks:
                if (lock.entity_id in entity_ids):
                    target_locks.append(lock)
        for lock in target_locks:
            if (service.service == SERVICE_LOCK_N_GO):
                unlatch = service.data[ATTR_UNLATCH]
                lock.lock_n_go(unlatch=unlatch)
            elif (service.service == SERVICE_UNLATCH):
                lock.unlatch()
    descriptions = load_yaml_config_file(path.join(path.dirname(__file__), 'services.yaml'))
    hass.services.register(DOMAIN, SERVICE_LOCK_N_GO, service_handler, descriptions.get(SERVICE_LOCK_N_GO), schema=LOCK_N_GO_SERVICE_SCHEMA)
    hass.services.register(DOMAIN, SERVICE_UNLATCH, service_handler, descriptions.get(SERVICE_UNLATCH), schema=UNLATCH_SERVICE_SCHEMA)

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, discovery_info=None):