FIX: single label per boxplot

rcomer · rcomer · commit 2d610df6f421 · 2024-02-10T18:28:26.000Z
diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
@@ -4004,9 +4004,6 @@ def boxplot(self, x, notch=None, sym=None, vert=None, whis=None,
             if 'color' in boxprops:
                 boxprops['edgecolor'] = boxprops.pop('color')
 
-        if labels:
-            boxprops['label'] = labels
-
         # if non-default sym value, put it into the flier dictionary
         # the logic for providing the default symbol ('b+') now lives
         # in bxp in the initial value of flierkw
@@ -4279,7 +4276,12 @@ def do_patch(xs, ys, **kwargs):
         for pos, width, stats, capwidth in zip(positions, widths, bxpstats,
                                                capwidths):
             # try to find a new label
-            datalabels.append(stats.get('label', pos))
+            if (label := stats.get('label')) is None:
+                datalabels.append(pos)
+                box_kw.pop('label', None)
+            else:
+                datalabels.append(label)
+                box_kw['label'] = label
 
             # whisker coords
             whis_x = [pos, pos]
diff --git a/lib/matplotlib/tests/test_legend.py b/lib/matplotlib/tests/test_legend.py
@@ -1467,3 +1467,13 @@ def test_boxplot_legend():
         assert handle.get_facecolor() == colors[index]
         assert handle.get_edgecolor() == colors[index]
         assert handle.get_label() == labels[index]
+
+
+def test_boxplot_multi_label():
+    # Smoke test that we can pass a 2D array and sequence of labels.
+    fig, ax = plt.subplots()
+
+    A = np.arange(30).reshape(10, 3)
+    labels = ['a', 'b', 'c']
+
+    ax.boxplot(A, labels=labels)
