import pytest
|
|
from pandas import DataFrame
|
import pandas._testing as tm
|
|
|
class TestSwaplevel:
|
def test_swaplevel(self, multiindex_dataframe_random_data):
|
frame = multiindex_dataframe_random_data
|
|
swapped = frame["A"].swaplevel()
|
swapped2 = frame["A"].swaplevel(0)
|
swapped3 = frame["A"].swaplevel(0, 1)
|
swapped4 = frame["A"].swaplevel("first", "second")
|
assert not swapped.index.equals(frame.index)
|
tm.assert_series_equal(swapped, swapped2)
|
tm.assert_series_equal(swapped, swapped3)
|
tm.assert_series_equal(swapped, swapped4)
|
|
back = swapped.swaplevel()
|
back2 = swapped.swaplevel(0)
|
back3 = swapped.swaplevel(0, 1)
|
back4 = swapped.swaplevel("second", "first")
|
assert back.index.equals(frame.index)
|
tm.assert_series_equal(back, back2)
|
tm.assert_series_equal(back, back3)
|
tm.assert_series_equal(back, back4)
|
|
ft = frame.T
|
swapped = ft.swaplevel("first", "second", axis=1)
|
exp = frame.swaplevel("first", "second").T
|
tm.assert_frame_equal(swapped, exp)
|
|
msg = "Can only swap levels on a hierarchical axis."
|
with pytest.raises(TypeError, match=msg):
|
DataFrame(range(3)).swaplevel()
|
