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

Demo/tkinter/guido/wish.py

@@ -23,7 +23,7 @@ while 1:
         tk.record(line)
         try:
             result = tk.call('eval', cmd)
-        except _tkinter.TclError, msg:
+        except _tkinter.TclError as msg:
             print 'TclError:', msg
         else:
             if result: print result