Give mapping views a usable repr.

diff --git a/Lib/_abcoll.py b/Lib/_abcoll.py
index c7636ec80e6f5e0a863f6facbe4b0d78d24e751c..45747a6c49ba127ae60b7a9f92f652d48589c17f 100644 (file)
--- a/Lib/_abcoll.py
+++ b/Lib/_abcoll.py
@@ -392,6 +392,9 @@ class MappingView(Sized):
     def __len__(self):
         return len(self._mapping)
 
+    def __repr__(self):
+        return '{0.__class__.__name__}({0._mapping!r})'.format(self)
+
 
 class KeysView(MappingView, Set):