1 files changed, 3 insertions, 0 deletions
diff --git a/apt/cache.py b/apt/cache.py
index 384afe31..bbf2165b 100644
--- a/apt/cache.py
+++ b/apt/cache.py
@@ -101,6 +101,9 @@ class Cache(object):
     def has_key(self, key):
         return self._dict.has_key(key)
 
+    def __contains__(self, key):
+        return key in self._dict
+
     def __len__(self):
         return len(self._dict)