Remove unnecessary '+' for string concatenation

afvincent · afvincent · commit 278913d38b15 · 2017-02-27T20:47:41.000+01:00
diff --git a/lib/matplotlib/rcsetup.py b/lib/matplotlib/rcsetup.py
@@ -930,7 +930,7 @@ def _validate_linestyle(ls):
         # (called inside the instance of validate_nseq_float).
         pass
 
-    raise ValueError("linestyle must be a valid string or " +
+    raise ValueError("linestyle must be a valid string or "
                      "an even-length sequence of floats.")
 
 
