def evaluateExpression(self, expr, message):
        efilter = EliotFilter(expr, [], BytesIO())
        return efilter._evaluate(message)
Deletes discount with passed id.
dataset/ETHPy150Open ClusterHQ/eliot/eliot/tests/test_filter.py/EliotFilterTests.evaluateExpression--crossover with--dataset/ETHPy150Open diefenbach/django-lfs/lfs/manage/discounts/views.py/delete_discount