From bbffb25c69f748a8842bb16718d79b86ad16b867 Mon Sep 17 00:00:00 2001
From: Mark Dickinson <dickinsm@gmail.com>
Date: Tue, 4 Aug 2009 21:57:18 +0000
Subject: [PATCH] Merged revisions 74312 via svnmerge from
 svn+ssh://pythondev@svn.python.org/python/trunk

........
  r74312 | mark.dickinson | 2009-08-04 22:56:04 +0100 (Tue, 04 Aug 2009) | 4 lines

  Issue #6620: Slightly safer code for _grouping_intervals in the locale
  module.  Fixes a 'possible use before assignment' warning from pylint.
  Thanks Vincent Legoll.
........
---
 Lib/locale.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Lib/locale.py b/Lib/locale.py
index f6d174c8599..4ab3c6a48c3 100644
--- a/Lib/locale.py
+++ b/Lib/locale.py
@@ -121,12 +121,15 @@ def localeconv():
 
 # 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:
             return
         # 0: re-use last group ad infinitum
         if interval == 0:
+            if last_interval is None:
+                raise ValueError("invalid grouping")
             while True:
                 yield last_interval
         yield interval