diff --git a/attributs.py b/attributs.py
index c6aa2b9..de90aa7 100644
--- a/attributs.py
+++ b/attributs.py
@@ -152,6 +152,11 @@ class AttrsList(list):
         super(AttrsList, self).__delitem__(index)
         self._commit()
 
+    def __setitem__(self, index, value):
+        self._start()
+        super(AttrsList, self).__setitem__(index, value)
+        self._commit()
+
     def append(self, val):
         self._start()
         super(AttrsList, self).append(val)
@@ -302,12 +307,6 @@ class Attr(object):
         else:
             return False
 
-    def __cmp__(self, obj):
-        if isinstance(obj, Attr):
-            return self.value.__cmp__(obj.value)
-        else:
-            return self.value.__cmp__(obj)
-
     def __nonzero__(self):
         if self.value:
             return True