Merge pull request #26828 from meeseeksmachine/auto-backport-of-pr-26825-on-v3.8.x

rcomer · web-flow · commit 9a4260ab1a0f · 2023-09-19T18:08:38.000+01:00
Backport PR #26825 on branch v3.8.x (Fix issue with non-string labels and legend)
diff --git a/lib/matplotlib/container.py b/lib/matplotlib/container.py
@@ -19,7 +19,7 @@ def __new__(cls, *args, **kwargs):
     def __init__(self, kl, label=None):
         self._callbacks = cbook.CallbackRegistry(signals=["pchanged"])
         self._remove_method = None
-        self._label = label
+        self._label = str(label) if label is not None else None
 
     def remove(self):
         for c in cbook.flatten(
diff --git a/lib/matplotlib/tests/test_container.py b/lib/matplotlib/tests/test_container.py
@@ -1,3 +1,4 @@
+import numpy as np
 import matplotlib.pyplot as plt
 
 
@@ -28,3 +29,9 @@ def test_errorbar_remove():
 
     eb = ax.errorbar([1], [1], fmt='none')
     eb.remove()
+
+
+def test_nonstring_label():
+    # Test for #26824
+    plt.bar(np.arange(10), np.random.rand(10), label=1)
+    plt.legend()
