Index: Lib/os.py
===================================================================
--- Lib/os.py	(revision 88915)
+++ Lib/os.py	(working copy)
@@ -286,15 +286,18 @@
         else:
             nondirs.append(name)
 
+    from collections import namedtuple
+    walktuple = namedtuple('walktuple', 'dirpath dirnames filenames')
+    
     if topdown:
-        yield top, dirs, nondirs
+        yield walktuple(top, dirs, nondirs)
     for name in dirs:
         new_path = join(top, name)
         if followlinks or not islink(new_path):
             for x in walk(new_path, topdown, onerror, followlinks):
                 yield x
     if not topdown:
-        yield top, dirs, nondirs
+        yield walktuple(top, dirs, nondirs)
 
 __all__.append("walk")