SF patch 1631942 by Collin Winter:

(a) "except E, V" -> "except E as V"
(b) V is now limited to a simple name (local variable)
(c) V is now deleted at the end of the except block

Lib/plat-mac/bundlebuilder.py

@@ -764,7 +764,7 @@ def makedirs(dir):
     directory. Don't moan if any path element already exists."""
     try:
         os.makedirs(dir)
-    except OSError, why:
+    except OSError as why:
         if why.errno != errno.EEXIST:
             raise