how to encrypt a string python

1from cryptography.fernet import Fernet
2message = "my deep dark secret".encode()
3
4f = Fernet(key)
5encrypted = f.encrypt(message)
6

1def load_key():
2    """
3    Loads the key named `secret.key` from the current directory.
4    """
5    return open("secret.key", "rb").read()
6