BUG: Series.plot(kind="pie") does not respect ylabel argument

Author: Abel Tavares

doc/source/whatsnew/v3.0.0.rst

@@ -37,6 +37,7 @@ Other enhancements
 - Users can globally disable any ``PerformanceWarning`` by setting the option ``mode.performance_warnings`` to ``False`` (:issue:`56920`)
 - :meth:`Styler.format_index_names` can now be used to format the index and column names (:issue:`48936` and :issue:`47489`)
 - :meth:`DataFrame.cummin`, :meth:`DataFrame.cummax`, :meth:`DataFrame.cumprod` and :meth:`DataFrame.cumsum` methods now have a ``numeric_only`` parameter (:issue:`53072`)
+- :meth:`Series.plot` and :meth:`DataFrame.plot` now correctly handle the ``ylabel`` parameter for pie charts, allowing for explicit control over the y-axis label (:issue:`58239`)
 
 .. ---------------------------------------------------------------------------
 .. _whatsnew_300.notable_bug_fixes:

pandas/plotting/_matplotlib/core.py

@@ -784,6 +784,8 @@ def _adorn_subplots(self, fig: Figure) -> None:
             # ylabel will set it as ylabel in the plot.
             if self.ylabel is not None:
                 ax.set_ylabel(pprint_thing(self.ylabel))
+            else:
+                ax.set_ylabel("")
 
             ax.grid(self.grid)
 

pandas/tests/plotting/frame/test_frame.py

@@ -1629,7 +1629,7 @@ def test_pie_df_subplots(self):
         for ax in axes:
             _check_text_labels(ax.texts, df.index)
         for ax, ylabel in zip(axes, df.columns):
-            assert ax.get_ylabel() == ylabel
+            assert ax.get_ylabel() == ""
 
     def test_pie_df_labels_colors(self):
         df = DataFrame(

pandas/tests/plotting/test_series.py

@@ -378,7 +378,7 @@ def test_pie_series(self):
         )
         ax = _check_plot_works(series.plot.pie)
         _check_text_labels(ax.texts, series.index)
-        assert ax.get_ylabel() == "YLABEL"
+        assert ax.get_ylabel() == ""
 
     def test_pie_series_no_label(self):
         series = Series(