test_analytics.py 文件源码

def test_ops_consistency_on_empty(self):

        # GH 7869
        # consistency on empty

        # float
        result = Series(dtype=float).sum()
        self.assertEqual(result, 0)

        result = Series(dtype=float).mean()
        self.assertTrue(isnull(result))

        result = Series(dtype=float).median()
        self.assertTrue(isnull(result))

        # timedelta64[ns]
        result = Series(dtype='m8[ns]').sum()
        self.assertEqual(result, Timedelta(0))

        result = Series(dtype='m8[ns]').mean()
        self.assertTrue(result is pd.NaT)

        result = Series(dtype='m8[ns]').median()
        self.assertTrue(result is pd.NaT)