--- a/web/views/undohistory.py	Tue Sep 08 18:04:57 2015 +0200
+++ b/web/views/undohistory.py	Tue Sep 15 16:15:03 2015 +0200
@@ -46,7 +46,7 @@
 
     def __str__(self):
         return '%s(%s)' % (self.__class__.__name__, ', '.join(
-            "%s=%v" % (str(k), str(v)) for k, v in kwargs.iteritems() ))
+            "%s=%v" % (str(k), str(v)) for k, v in kwargs.items() ))
 
     def __call__(self, cls, req, tx_action=None, **kwargs):
         # tx_action is expected to be a transaction.AbstractAction