test_pandas.py 文件源码

def test_frame_empty_mixedtype(self):
        # mixed type
        df = DataFrame(columns=['jim', 'joe'])
        df['joe'] = df['joe'].astype('i8')
        self.assertTrue(df._is_mixed_type)
        assert_frame_equal(read_json(df.to_json(), dtype=dict(df.dtypes)), df,
                           check_index_type=False)