Give mapping views a usable repr.

rhettinger · rhettinger · commit 89fc2b78214b · 2009-02-27T07:47:32.000Z
diff --git a/Lib/_abcoll.py b/Lib/_abcoll.py
@@ -392,6 +392,9 @@ def __init__(self, mapping):
     def __len__(self):
         return len(self._mapping)
 
+    def __repr__(self):
+        return '{0.__class__.__name__}({0._mapping!r})'.format(self)
+
 
 class KeysView(MappingView, Set):
 
