Give mapping views a usable repr.

diff --git a/Lib/_abcoll.py b/Lib/_abcoll.py
index 942a72c0ce76cf25342cd96f88044a58c16687c8..40cc23e0489ef6eda09a1c2e18064919aa840284 100644 (file)
--- a/Lib/_abcoll.py
+++ b/Lib/_abcoll.py
@@ -371,6 +371,9 @@ 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):