must provide this method
diff --git a/Lib/collections.py b/Lib/collections.py
index 0d35bfd..8fb123f 100644
--- a/Lib/collections.py
+++ b/Lib/collections.py
@@ -132,6 +132,9 @@
                    all(p==q for p, q in zip(self.items(), other.items()))
         return dict.__eq__(self, other)
 
+    def __ne__(self, other):
+        return not self == other
+
 
 
 ################################################################################