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

@@ -114,12 +114,15 @@ 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