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/filecmp.py

@@ -148,12 +148,12 @@ class dircmp:
             ok = 1
             try:
                 a_stat = os.stat(a_path)
-            except os.error, why:
+            except os.error as why:
                 # print 'Can\'t stat', a_path, ':', why[1]
                 ok = 0
             try:
                 b_stat = os.stat(b_path)
-            except os.error, why:
+            except os.error as why:
                 # print 'Can\'t stat', b_path, ':', why[1]
                 ok = 0