| 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374 |
- import numpy as np
- import pytest
- from pandas import (
- DataFrame,
- MultiIndex,
- )
- import pandas._testing as tm
- class TestReorderLevels:
- def test_reorder_levels(self, frame_or_series):
- index = MultiIndex(
- levels=[["bar"], ["one", "two", "three"], [0, 1]],
- codes=[[0, 0, 0, 0, 0, 0], [0, 1, 2, 0, 1, 2], [0, 1, 0, 1, 0, 1]],
- names=["L0", "L1", "L2"],
- )
- df = DataFrame({"A": np.arange(6), "B": np.arange(6)}, index=index)
- obj = tm.get_obj(df, frame_or_series)
- # no change, position
- result = obj.reorder_levels([0, 1, 2])
- tm.assert_equal(obj, result)
- # no change, labels
- result = obj.reorder_levels(["L0", "L1", "L2"])
- tm.assert_equal(obj, result)
- # rotate, position
- result = obj.reorder_levels([1, 2, 0])
- e_idx = MultiIndex(
- levels=[["one", "two", "three"], [0, 1], ["bar"]],
- codes=[[0, 1, 2, 0, 1, 2], [0, 1, 0, 1, 0, 1], [0, 0, 0, 0, 0, 0]],
- names=["L1", "L2", "L0"],
- )
- expected = DataFrame({"A": np.arange(6), "B": np.arange(6)}, index=e_idx)
- expected = tm.get_obj(expected, frame_or_series)
- tm.assert_equal(result, expected)
- result = obj.reorder_levels([0, 0, 0])
- e_idx = MultiIndex(
- levels=[["bar"], ["bar"], ["bar"]],
- codes=[[0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0]],
- names=["L0", "L0", "L0"],
- )
- expected = DataFrame({"A": np.arange(6), "B": np.arange(6)}, index=e_idx)
- expected = tm.get_obj(expected, frame_or_series)
- tm.assert_equal(result, expected)
- result = obj.reorder_levels(["L0", "L0", "L0"])
- tm.assert_equal(result, expected)
- def test_reorder_levels_swaplevel_equivalence(
- self, multiindex_year_month_day_dataframe_random_data
- ):
- ymd = multiindex_year_month_day_dataframe_random_data
- result = ymd.reorder_levels(["month", "day", "year"])
- expected = ymd.swaplevel(0, 1).swaplevel(1, 2)
- tm.assert_frame_equal(result, expected)
- result = ymd["A"].reorder_levels(["month", "day", "year"])
- expected = ymd["A"].swaplevel(0, 1).swaplevel(1, 2)
- tm.assert_series_equal(result, expected)
- result = ymd.T.reorder_levels(["month", "day", "year"], axis=1)
- expected = ymd.T.swaplevel(0, 1, axis=1).swaplevel(1, 2, axis=1)
- tm.assert_frame_equal(result, expected)
- with pytest.raises(TypeError, match="hierarchical axis"):
- ymd.reorder_levels([1, 2], axis=1)
- with pytest.raises(IndexError, match="Too many levels"):
- ymd.index.reorder_levels([1, 2, 3])
|
