Override Mapping.__contains__ in DataMapping

This allows membership tests to check for existence within data, rather than existence of the attribute at all

diff --git a/tweepy/mixins.py b/tweepy/mixins.py
index ecd5b5713a9e06c51ba5f778e09639d35c8a6a5f..5884ff47e267211b9aa38881cb7bda764b3c5d9a 100644 (file)
--- a/tweepy/mixins.py
+++ b/tweepy/mixins.py
@@ -25,6 +25,9 @@ class HashableID(EqualityComparableID):
 class DataMapping(Mapping):
     __slots__ = ()
 
+    def __contains__(self, item):
+        return item in self.data
+
     def __getattr__(self, name):
         try:
             return self.data[name]