Linting

Author: Brendan Drury

doc/source/whatsnew/v1.4.0.rst

@@ -485,7 +485,7 @@ Period
 
 Plotting
 ^^^^^^^^
--
+- Fixed bug in :meth:`boxplot._grouped_plot_by_column` where trying to plot data of dtype ``object`` caused plotting to fail even if some data was numeric
 -
 
 Groupby/resample/rolling

pandas/plotting/_matplotlib/boxplot.py

@@ -390,7 +390,7 @@ def plot_group(keys, values, ax: Axes):
             rc = {"figure.figsize": figsize} if figsize is not None else {}
             with plt.rc_context(rc):
                 ax = plt.gca()
-        data = data.apply(pd.to_numeric, errors='ignore')
+        data = data.apply(pd.to_numeric, errors="ignore")
         data = data._get_numeric_data()
         if columns is None:
             columns = data.columns

pandas/tests/plotting/test_boxplot_method.py

@@ -542,14 +542,12 @@ def test_groupby_boxplot_subplots_false(self, col, expected_xticklabel):
 
         result_xticklabel = [x.get_text() for x in axes.get_xticklabels()]
         assert expected_xticklabel == result_xticklabel
-        
+
     def test_groupby_boxplot_object(self):
         # GH 43480
         df = self.hist_df.astype("object")
         grouped = df.groupby("gender")
-        _check_plot_works(
-            grouped.boxplot, subplots=False
-        )
+        _check_plot_works(grouped.boxplot, subplots=False)
 
     def test_boxplot_multiindex_column(self):
         # GH 16748