Remove list prenpost.  It's not used any longer.
diff --git a/Demo/newmetaclasses/Eiffel.py b/Demo/newmetaclasses/Eiffel.py
index ac9a3fe..e73d0ca 100644
--- a/Demo/newmetaclasses/Eiffel.py
+++ b/Demo/newmetaclasses/Eiffel.py
@@ -14,11 +14,9 @@
         """
         # find methods with pre or post conditions
         methods = []
-        prenpost = []
         for k, v in dict.iteritems():
             if k.endswith('_pre') or k.endswith('_post'):
                 assert isinstance(v, function)
-                prenpost.append(k)
             elif isinstance(v, function):
                 methods.append(k)
         for m in methods:
@@ -60,7 +58,6 @@
 
     def __call__(self, *args, **kwargs):
         return self._descr.callmethod(self._inst, args, kwargs)
-        
 
 class EiffelDescriptor(object):