diff -r 0808cb8c60fd Lib/idlelib/CallTips.py
--- a/Lib/idlelib/CallTips.py	Sun Jun 03 12:27:07 2012 -0400
+++ b/Lib/idlelib/CallTips.py	Sun Jun 03 16:12:20 2012 -0500
@@ -120,7 +120,7 @@
 def _find_constructor(class_ob):
     "Find the nearest __init__() in the class tree."
     try:
-        return class_ob.__init__.__func__
+        return class_ob.__init__
     except AttributeError:
         for base in class_ob.__bases__:
             init = _find_constructor(base)