I have been using Google Cloud PubSub to trigger Google Cloud Functions. Until this point I have been using a single argument "uuid", now I need to send also development/production flag.

Here below is the publisher in Google App Engine/Django:

```
    publisher = pubsub_v1.PublisherClient()
    topic_name = 'projects/project/topics/cloudfunction_topic'
    message_to_publish = video.uuid
    publisher.publish(topic_name, data=message_to_publish.encode('utf-8'), spam='')

```

Here below is the subscriber section in GCF:

```
    if os.getenv('GCF', None):
        uuid = base64.b64decode(event['data']).decode('utf-8')

```

How should I change this so there can be multiple arguments (video.uuid, production/development) in the message ?