MappingView is Sized.

diff --git a/Lib/_abcoll.py b/Lib/_abcoll.py
index c241a9502e7fbb530fe1c2701ef07aeed8758704..cc4c4423e8a60807901b7434f2c47144b53b5206 100644 (file)
--- a/Lib/_abcoll.py
+++ b/Lib/_abcoll.py
@@ -382,7 +382,7 @@ class Mapping(Sized, Iterable, Container):
         return not (self == other)
 
 
-class MappingView(metaclass=ABCMeta):
+class MappingView(Sized):
 
     def __init__(self, mapping):
         self._mapping = mapping