--- a/cwvreg.py	Mon Mar 11 18:37:01 2013 +0100
+++ b/cwvreg.py	Fri Feb 22 19:36:40 2013 +0100
@@ -197,7 +197,7 @@
 from os.path import join, dirname, realpath
 from warnings import warn
 from datetime import datetime, date, time, timedelta
-from functools import partial
+from functools import partial, reduce
 
 from logilab.common.decorators import cached, clear_cache
 from logilab.common.deprecation import deprecated, class_deprecated