added a new argument use_marker=True to fix the issue with line markers showing up on boxplots. added a test.

pharshalp · pharshalp · commit 6fceb0543694 · 2019-12-24T13:39:40.000-05:00
diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
@@ -3910,10 +3910,13 @@ def bxp(self, bxpstats, positions=None, widths=None, vert=True,
 
         zdelta = 0.1
 
-        def line_props_with_rcdefaults(subkey, explicit, zdelta=0):
+        def line_props_with_rcdefaults(subkey, explicit, zdelta=0,
+                                       use_marker=True):
             d = {k.split('.')[-1]: v for k, v in rcParams.items()
                  if k.startswith(f'boxplot.{subkey}')}
             d['zorder'] = zorder + zdelta
+            if not use_marker:
+                d['marker'] = ''
             if explicit is not None:
                 d.update(
                     cbook.normalize_kwargs(explicit, mlines.Line2D._alias_map))
@@ -3934,15 +3937,16 @@ def line_props_with_rcdefaults(subkey, explicit, zdelta=0):
                     cbook.normalize_kwargs(
                         boxprops, mpatches.PathPatch._alias_map))
         else:
-            final_boxprops = line_props_with_rcdefaults('boxprops', boxprops)
+            final_boxprops = line_props_with_rcdefaults('boxprops', boxprops,
+                                                        use_marker=False)
         final_whiskerprops = line_props_with_rcdefaults(
-            'whiskerprops', whiskerprops)
+            'whiskerprops', whiskerprops, use_marker=False)
         final_capprops = line_props_with_rcdefaults(
-            'capprops', capprops)
+            'capprops', capprops, use_marker=False)
         final_flierprops = line_props_with_rcdefaults(
             'flierprops', flierprops)
         final_medianprops = line_props_with_rcdefaults(
-            'medianprops', medianprops, zdelta)
+            'medianprops', medianprops, zdelta, use_marker=False)
         final_meanprops = line_props_with_rcdefaults(
             'meanprops', meanprops, zdelta)
         removed_prop = 'marker' if meanline else 'linestyle'
diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
@@ -2701,6 +2701,24 @@ def test_boxplot_bad_ci_2():
         ax.boxplot([x, x], conf_intervals=[[1, 2], [1]])
 
 
+def test_boxplot_marker_behavior():
+    plt.rcParams['lines.marker'] = 's'
+    plt.rcParams['boxplot.flierprops.marker'] = 'o'
+    plt.rcParams['boxplot.meanprops.marker'] = '^'
+    fig, ax = plt.subplots()
+    test_data = np.arange(100)
+    test_data[-1] = 150  # a flier point
+    bxp_handle = ax.boxplot(test_data, showmeans=True)
+    for bxp_lines in ['whiskers', 'caps', 'boxes', 'medians']:
+        for each_line in bxp_handle[bxp_lines]:
+            # Ensure that the rcParams['lines.marker'] is overridden by ''
+            assert each_line.get_marker() == ''
+
+    # Ensure that markers for fliers and means aren't overridden with ''
+    assert bxp_handle['fliers'][0].get_marker() == 'o'
+    assert bxp_handle['means'][0].get_marker() == '^'
+
+
 @image_comparison(['boxplot_mod_artists_after_plotting.png'],
                   remove_text=True, savefig_kwarg={'dpi': 40}, style='default')
 def test_boxplot_mod_artist_after_plotting():
