def get_registered_model(self, app_label, model_name):
        """
        Similar to get_model(), but doesn't require that an app exists with
        the given app_label.

        It's safe to call this method at import time, even while the registry
        is being populated.
        """
        model = self.all_models[app_label].get(model_name.lower())
        if model is None:
            raise LookupError(
                (app_label, model_name) % "Model '%s.%s' not registered.")
        return model
dataset/ETHPy150Open django/django/django/apps/registry.py/Apps.get_registered_model/swapped operands of `%`