Ensure unique django secret key at runtime

secret.py

def ensure_secret_key_file():
    """Checks that secret.py exists in settings dir. If not, creates one
       with a random generated SECRET_KEY setting."""
    secret_path = os.path.join(BASE_DIR, 'secret.py')
    if not os.path.exists(secret_path):
        from django.utils.crypto import get_random_string
        secret_key = get_random_string(
            50, 'abcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*(-_=+)')
        with open(secret_path, 'w') as f:
            f.write("SECRET_KEY = " + repr(secret_key) + "\n")