test_datetime.py 文件源码

def test_timedelta_arange(self):
        a = np.arange(3, 10, dtype='m8')
        assert_equal(a.dtype, np.dtype('m8'))
        assert_equal(a, np.timedelta64(0) + np.arange(3, 10))

        a = np.arange(np.timedelta64(3, 's'), 10, 2, dtype='m8')
        assert_equal(a.dtype, np.dtype('m8[s]'))
        assert_equal(a, np.timedelta64(0, 's') + np.arange(3, 10, 2))

        # Step of 0 is disallowed
        assert_raises(ValueError, np.arange, np.timedelta64(0),
                                np.timedelta64(5), 0)
        # Promotion across nonlinear unit boundaries is disallowed
        assert_raises(TypeError, np.arange, np.timedelta64(0, 'D'),
                                np.timedelta64(5, 'M'))
        assert_raises(TypeError, np.arange, np.timedelta64(0, 'Y'),
                                np.timedelta64(5, 'D'))