def test_uncorrected_stdev(self):
        sequences = [([1, 1, 1], 0),
                     ([1, 2, 3], math.sqrt(3 / 2.0)),
                     ([-1, -1, -1], 0),
                     ([1], 0),
                     ([-1, -2, -3], math.sqrt(2.0 / 3)),
                     ([], None)]

        for seq, std in sequences:
            self.assertEqual(ssbench.util.uncorrected_stdev(seq), std)
dataset/ETHPy150Open swiftstack/ssbench/ssbench/tests/test_util.py/TestUtil.test_uncorrected_stdev/swapped operands of `/`