Python 3 preparation: update map() calls as needed.

Tool-assisted patch.  Note one place using map with first argument
None (not supported in Python 3) which needed to change to using
itertools.zip_longest (respectively itertools.izip_longest in Python
2).

Author: jsm28

frontends/ZRoundup/ZRoundup.py

@@ -88,7 +88,7 @@ def __init__(self, form):
     def __getitem__(self, item):
         entry = self.__form[item]
         if isinstance(entry, type([])):
-            entry = map(FormItem, entry)
+            entry = list(map(FormItem, entry))
         else:
             entry = FormItem(entry)
         return entry

roundup/cgi/templating.py

@@ -56,6 +56,10 @@
     from docutils.core import publish_parts as ReStructuredText
 except ImportError:
     ReStructuredText = None
+try:
+    from itertools import zip_longest
+except ImportError:
+    from itertools import izip_longest as zip_longest
 
 # bring in the templating support
 from roundup.cgi import TranslationService, ZTUtils
@@ -2614,7 +2618,7 @@ def _parse_sort(self, var, name):
         # in that case anyway but...
         if self.classname:
             cls = self.client.db.getclass(self.classname)
-        for f, d in map(None, fields, dirs):
+        for f, d in zip_longest(fields, dirs):
             if f.startswith('-'):
                 dir, propname = '-', f[1:]
             elif d: