()
| 1590 | |
| 1591 | |
| 1592 | def test_diff(): |
| 1593 | df = DataFrame({"a": [1, 2, 3], "b": 1.5}) |
| 1594 | |
| 1595 | result = df.diff() |
| 1596 | assert result.index is not df.index |
| 1597 | assert result.columns is not df.columns |
| 1598 | |
| 1599 | ser = Series([1, 2, 3]) |
| 1600 | result = ser.diff() |
| 1601 | assert result.index is not ser.index |