I was wondering about the best practices for indicating invalid argument combinations in Python. I've come across a few situations where you have a function like so:
def import_to_orm(name, save=False, recurse=False): """ :param name: Name of some external entity to import. :param save: Save the ORM object before returning. :param recurse: Attempt to import associated objects as well. Because you need the original object to have a key to relate to, save must be `True` for recurse to be `True`. :raise BadValueError: If `recurse and not save`. :return: The ORM object. """ pass
The only annoyance with this is that every package has its own, usually slightly differing
BadValueError. I know that in Java there exists
java.lang.IllegalArgumentException — is it well understood that everybody will be creating their own
BadValueErrors in Python or is there another, preferred method?