human
I wrote the below code

    keys = [str(i) for i in range(len(actions))]
    key_provider = create_mock_key_provider(keys)
    digest_provider = MockDigestProvider(actions, logs)
    digest_validator = Mock()
    def validate(bucket, key, public_key, digest_data, digest_str):
        if ('_invalid' in digest_data):
            raise DigestError('invalid    error')
    digest_validator.validate = validate
    return (key_provider, digest_provider, digest_validator)

What's a good function header?

Here's a good function header?
assistant
#Here's a good function header.

def create_scenario(actions, logs=None):