--- a/web/facet.py Mon Mar 11 18:37:01 2013 +0100
+++ b/web/facet.py Fri Feb 22 19:36:40 2013 +0100
@@ -49,6 +49,7 @@
__docformat__ = "restructuredtext en"
_ = unicode
+from functools import reduce
from warnings import warn
from copy import deepcopy
from datetime import datetime, timedelta