Fix typo: missing singlequote in unrecognized backend exception

NicoWeio · web-flow · commit 7d336bc643c2 · 2025-05-01T15:08:46.000+02:00
diff --git a/lib/matplotlib/backends/registry.py b/lib/matplotlib/backends/registry.py
@@ -407,7 +407,7 @@ def resolve_gui_or_backend(self, gui_or_backend):
             return self.resolve_backend(gui_or_backend)
         except Exception:  # KeyError ?
             raise RuntimeError(
-                f"'{gui_or_backend} is not a recognised GUI loop or backend name")
+                f"'{gui_or_backend}' is not a recognised GUI loop or backend name")
 
 
 # Singleton
