def empty(self):
        with self.mutex:
            return not self._qsize()
In a unique together validation, all fields are required.
dataset/ETHPy150Open amrdraz/kodr/app/brython/www/src/Lib/queue.py/Queue.empty--crossover with--dataset/ETHPy150Open tomchristie/django-rest-framework/tests/test_validators.py/TestUniquenessTogetherValidation.test_unique_together_is_required