django auth.autenticateで_authenticate_with_backend functionが廃止されていた - Qiita

def authenticate(request=None, **credentials): """ If the given credentials are valid, return a User object. """ for backend, backend_path in _get_backends(return_tuples=True): try: user = _authenticate_with_backend(backend, backend_path, request, credentials) except PermissionDenied: # This backend says to stop in our tracks - this user should not be allowed in at all. break if user is None: cont