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
diff --git a/Lib/re.py b/Lib/re.py
index a33e34e..7388e4b 100644
--- a/Lib/re.py
+++ b/Lib/re.py
@@ -229,7 +229,7 @@
         raise TypeError, "first argument must be string or compiled pattern"
     try:
         p = sre_compile.compile(pattern, flags)
-    except error, v:
+    except error as v:
         raise error, v # invalid expression
     if len(_cache) >= _MAXCACHE:
         _cache.clear()
@@ -244,7 +244,7 @@
     repl, pattern = key
     try:
         p = sre_parse.parse_template(repl, pattern)
-    except error, v:
+    except error as v:
         raise error, v # invalid expression
     if len(_cache_repl) >= _MAXCACHE:
         _cache_repl.clear()