Python 3 preparation: update calls to dict methods. Tool-assisted patch. Changes of iterkeys / itervalues / iteritems to keys / values / items are fully automated, but may make things less efficient in Python 2. Automated tools want to add list() around many calls to keys / values / items, but I thought most such list() additions were unnecessary because it seemed the result of keys / values / items was just iterated over while the set of dict keys remained unchanged, rather than used in a way requiring an actual list, or used while the set of keys in the dict could change. It's quite possible I missed some cases where list() was really needed, or left in some unnecessary list() calls. In cases where list() was only needed because the resulting list was then sorted in-place, I changed the code to use calls to sorted().

--- a/frontends/ZRoundup/ZRoundup.py	Tue Jul 24 23:03:35 2018 +0000
+++ b/frontends/ZRoundup/ZRoundup.py	Tue Jul 24 23:04:42 2018 +0000
@@ -102,7 +102,7 @@
     def has_key(self, item):
         return item in self.__form
     def keys(self):
-        return self.__form.keys()
+        return list(self.__form.keys())
 
     def __repr__(self):
         return '<ZRoundup.FormWrapper %r>'%self.__form