This code snippet takes a Django secret from an environment variable or generates a random one automatically exactly once for testing. This hasn't been tested with multiple processes, so might not work as expected in a situation such as running a Celery daemon.

gistfile1.txt

# use secret from environment or make a random one exactly once
SECRET_KEY = os.environ.get(
    'DJANGO_SECRET',
    os.environ.update({
        'DJANGO_SECRET': ''.join([random.SystemRandom().choice(
            string.digits + string.letters + string.punctuation)
            for i in range(50)])}))