Use enumerate.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@2554 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/client/mq.py

@@ -289,8 +289,7 @@ class MQ(object):
 
         # Expire old elements.
         time = self._time
-        for level in xrange(self._buffer_levels):
-            cache_buffer = cache_buffers[level]
+        for level, cache_buffer in enumerate(cache_buffers):
             head = cache_buffer.head
             if head is not None and head.data.expire_time < time:
                 del cache_buffer[head]