def exclude(self, *args, **kwargs):
        return self._filter_or_exclude(True, *args, **kwargs)
callback or errback may be None, but at least one must be
dataset/ETHPy150Open django/django/django/db/models/query.py/QuerySet.exclude--crossover with--dataset/ETHPy150Open crossbario/txaio/txaio/aio.py/add_callbacks