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/Demo/comparisons/regextest.py b/Demo/comparisons/regextest.py
index b27d741..1fab052 100755
--- a/Demo/comparisons/regextest.py
+++ b/Demo/comparisons/regextest.py
@@ -28,7 +28,7 @@
     for file in sys.argv[1:]:
         try:
             fp = open(file, 'r')
-        except IOError, msg:
+        except IOError as msg:
             print "%s: %s" % (file, msg)
             continue
         lineno = 0