test_datetime.py 文件源码

def test_dtype_promotion(self):
        # datetime <op> datetime computes the metadata gcd
        # timedelta <op> timedelta computes the metadata gcd
        for mM in ['m', 'M']:
            assert_equal(
                np.promote_types(np.dtype(mM+'8[2Y]'), np.dtype(mM+'8[2Y]')),
                np.dtype(mM+'8[2Y]'))
            assert_equal(
                np.promote_types(np.dtype(mM+'8[12Y]'), np.dtype(mM+'8[15Y]')),
                np.dtype(mM+'8[3Y]'))
            assert_equal(
                np.promote_types(np.dtype(mM+'8[62M]'), np.dtype(mM+'8[24M]')),
                np.dtype(mM+'8[2M]'))
            assert_equal(
                np.promote_types(np.dtype(mM+'8[1W]'), np.dtype(mM+'8[2D]')),
                np.dtype(mM+'8[1D]'))
            assert_equal(
                np.promote_types(np.dtype(mM+'8[W]'), np.dtype(mM+'8[13s]')),
                np.dtype(mM+'8[s]'))
            assert_equal(
                np.promote_types(np.dtype(mM+'8[13W]'), np.dtype(mM+'8[49s]')),
                np.dtype(mM+'8[7s]'))
        # timedelta <op> timedelta raises when there is no reasonable gcd
        assert_raises(TypeError, np.promote_types,
                            np.dtype('m8[Y]'), np.dtype('m8[D]'))
        assert_raises(TypeError, np.promote_types,
                            np.dtype('m8[M]'), np.dtype('m8[W]'))
        # timedelta <op> timedelta may overflow with big unit ranges
        assert_raises(OverflowError, np.promote_types,
                            np.dtype('m8[W]'), np.dtype('m8[fs]'))
        assert_raises(OverflowError, np.promote_types,
                            np.dtype('m8[s]'), np.dtype('m8[as]'))