Add suggestions to ColorSequenceRegistry lookup errors

QuLogic · QuLogic · commit f084447d7b49 · 2026-04-17T13:53:39.000-04:00
diff --git a/lib/matplotlib/colors.py b/lib/matplotlib/colors.py
@@ -142,10 +142,8 @@ def __init__(self):
         self._color_sequences = {**self._BUILTIN_COLOR_SEQUENCES}
 
     def __getitem__(self, item):
-        try:
-            return list(self._color_sequences[item])
-        except KeyError:
-            raise KeyError(f"{item!r} is not a known color sequence name")
+        return list(_api.getitem_checked(self._color_sequences, _error_cls=KeyError,
+                                         sequence_name=item))
 
     def __iter__(self):
         return iter(self._color_sequences)
diff --git a/lib/matplotlib/tests/test_colors.py b/lib/matplotlib/tests/test_colors.py
@@ -1885,6 +1885,12 @@ def test_close_error_name():
             r"'grays' is not a valid value for colormap\. "
             r"Did you mean one of: 'gray', 'Grays', 'gray_r'\?")):
         matplotlib.colormaps["grays"]
+    with pytest.raises(
+        KeyError,
+        match=(
+            "'set' is not a valid value for sequence_name. "
+            "Did you mean one of: 'Set3', 'Set2', 'Set1'?")):
+        matplotlib.color_sequences["set"]
 
 
 def test_multi_norm_creation():
