Backport PR #15296: Fix typo/bug from 18cecf7

jklymak · MeeseeksDev[bot] · commit 092573197306 · 2019-09-18T22:10:01.000Z
diff --git a/lib/matplotlib/rcsetup.py b/lib/matplotlib/rcsetup.py
@@ -471,7 +471,7 @@ def validate_fontweight(s):
     try:
         return int(s)
     except (ValueError, TypeError):
-        raise ValueError(f'{s} is not a valid font weight. %s')
+        raise ValueError(f'{s} is not a valid font weight.')
 
 
 def validate_font_properties(s):
