def save_payment_sources(self, order):
        if not self._payment_sources:
            return
        for source in self._payment_sources:
            source.order = order
            source.save()
Make an empty file in the given location. Raises an error if
dataset/ETHPy150Open django-oscar/django-oscar/src/oscar/apps/checkout/mixins.py/OrderPlacementMixin.save_payment_sources--crossover with--dataset/ETHPy150Open Yelp/mrjob/mrjob/fs/base.py/Filesystem.touchz