Index: locale.py
===================================================================
--- locale.py	(revision 74276)
+++ locale.py	(working copy)
@@ -121,6 +121,7 @@
 
 # Iterate over grouping intervals
 def _grouping_intervals(grouping):
+    last_interval = None
     for interval in grouping:
         # if grouping is -1, we are done
         if interval == CHAR_MAX: