def delivery(self):
        trans = self._find_translation()

        if trans:
            return trans.delivery
        else:
            return ""
Call this from a test function to test for garbage collection
dataset/ETHPy150Open dokterbob/satchmo/satchmo/apps/shipping/modules/tieredquantity/models.py/Carrier.delivery--crossover with--dataset/ETHPy150Open enthought/mayavi/tvtk/tests/common.py/TestGarbageCollection.check_object_garbage_collected