Update lib/matplotlib/backend_bases.py

ianthomas23 · timhoffm · ianthomas23 · commit 5a7a7a2ef95e · 2024-02-27T11:15:56.000Z
Co-authored-by: Tim Hoffmann &lt;2836374+timhoffm@users.noreply.github.com&gt;
diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
@@ -108,7 +108,7 @@ def _safe_pyplot_import():
         from matplotlib.backends.registry import backend_registry
         backend = backend_registry.backend_for_gui_framework(current_framework)
         if backend is None:
-            raise KeyError(backend)
+            raise RuntimeError(f"No suitable backend for the current GUI framework {current_framework!r}")
 
         rcParams["backend"] = mpl.rcParamsOrig["backend"] = backend
         import matplotlib.pyplot as plt  # Now this should succeed.
