Merge pull request #5707 from jayvdb/missing-string-format-key

tacaswell · tacaswell · commit d6ed8eb95409 · 2015-12-21T16:51:39.000-05:00
Fix string format substitution key missing error
diff --git a/examples/api/filled_step.py b/examples/api/filled_step.py
@@ -41,7 +41,7 @@ def filled_hist(ax, edges, values, bottoms=None, orientation='v',
     """
     print(orientation)
     if orientation not in set('hv'):
-        raise ValueError("orientation must be in {'h', 'v'} "
+        raise ValueError("orientation must be in {{'h', 'v'}} "
                          "not {o}".format(o=orientation))
 
     kwargs.setdefault('step', 'post')
