def test_column_std(self):
        def test_impl():
            A = np.array([1., 2., 3.])
            A[0] = 4.0
            df = pd.DataFrame({'A': A})
            return df.A.std()

        hpat_func = self.jit(test_impl)
        np.testing.assert_almost_equal(hpat_func(), test_impl())