def test_lefthand_subtraction(self):
        # LH Subtraction of floats and integers
        Number.objects.filter(pk=self.n.pk).update(integer=15 - F('integer'), float=F('float') - 42.7)

        self.assertEqual(Number.objects.get(pk=self.n.pk).integer, 27)
        self.assertEqual(Number.objects.get(pk=self.n.pk).float, Approximate(-27.200, places=3))
dataset/ETHPy150Open django/django/tests/expressions/tests.py/ExpressionOperatorTests.test_lefthand_subtraction/swapped operands of `-`