Whatsnew entry for DataFrame.sort_values by index (10806)

Author: IamJeffG

doc/source/whatsnew/v0.19.0.txt

@@ -229,6 +229,7 @@ Other enhancements
 - ``pd.read_html()`` has gained support for the ``decimal`` option (:issue:`12907`)
 - A top-level function :func:`union_categorical` has been added for combining categoricals, see :ref:`Unioning Categoricals<categorical.union>` (:issue:`13361`)
 - ``Series`` has gained the properties ``.is_monotonic``, ``.is_monotonic_increasing``, ``.is_monotonic_decreasing``, similar to ``Index`` (:issue:`13336`)
+- ``DataFrame.sort_values()`` has gained support for re-ordering columns by index label (:issue:`10806`)
 
 .. _whatsnew_0190.api:
 

pandas/tests/frame/test_sorting.py

@@ -129,7 +129,8 @@ def test_sort_values(self):
         expected = frame.reindex(columns=['B', 'A', 'C'])
         assert_frame_equal(sorted_df, expected)
 
-        sorted_df = frame.sort_values(by=[1, 3], axis=1, ascending=[True, False])
+        sorted_df = frame.sort_values(by=[1, 3], axis=1,
+                                      ascending=[True, False])
         assert_frame_equal(sorted_df, expected)
 
         sorted_df = frame.sort_values(by=[1, 3], axis=1, ascending=False)