test_base.py 文件源码

def test_drop_duplicates_metadata(self):
        # GH 10115
        idx = pd.period_range('2011-01-01', '2011-01-31', freq='D', name='idx')
        result = idx.drop_duplicates()
        self.assert_index_equal(idx, result)
        self.assertEqual(idx.freq, result.freq)

        idx_dup = idx.append(idx)  # freq will not be reset
        result = idx_dup.drop_duplicates()
        self.assert_index_equal(idx, result)
        self.assertEqual(idx.freq, result.freq)