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BUG: Fix sort_values for empty by argument #40324

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merged 4 commits into from
Mar 9, 2021
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BUG: Fix sort_values for empty by argument #40324

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BUG: Fix sort_values for empty by argument
dsaxton Mar 9, 2021
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dsaxton Mar 9, 2021
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2 changes: 1 addition & 1 deletion doc/source/whatsnew/v1.2.4.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,7 @@ Fixed regressions
Bug fixes
~~~~~~~~~

-
- Fixed bug in :meth:`DataFrame.sort_values` raising an :class:`IndexError` for empty ``by`` (:issue:`40258`)
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move to 1.3, this is an expansion not a regression.

-

.. ---------------------------------------------------------------------------
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4 changes: 3 additions & 1 deletion pandas/core/frame.py
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Expand Up @@ -5818,7 +5818,7 @@ def sort_values( # type: ignore[override]
keys, orders=ascending, na_position=na_position, key=key
)
indexer = ensure_platform_int(indexer)
else:
elif len(by):

by = by[0]
k = self._get_label_or_level_values(by, axis=axis)
Expand All @@ -5833,6 +5833,8 @@ def sort_values( # type: ignore[override]
indexer = nargsort(
k, kind=kind, ascending=ascending, na_position=na_position, key=key
)
else:
return self.copy()

new_data = self._mgr.take(
indexer, axis=self._get_block_manager_axis(axis), verify=False
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5 changes: 5 additions & 0 deletions pandas/tests/frame/methods/test_sort_values.py
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Expand Up @@ -79,6 +79,11 @@ def test_sort_values(self):
with pytest.raises(ValueError, match=msg):
frame.sort_values(by=["A", "B"], axis=0, ascending=[True] * 5)

# https://github.com/pandas-dev/pandas/issues/40258
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can you add a separate test. also assert that it is not the same frame.

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can you make a completely separate test

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we dont' normally want to mix error checking with other things

sorted_df = frame.sort_values(by=[])
tm.assert_frame_equal(sorted_df, frame)
assert sorted_df is not frame

def test_sort_values_inplace(self):
frame = DataFrame(
np.random.randn(4, 4), index=[1, 2, 3, 4], columns=["A", "B", "C", "D"]
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