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/ManPage.py

@@ -95,7 +95,7 @@ class EditableManPage(ScrolledText):
             self._parseline('')
         try:
             self.tk.deletefilehandler(self.fp)
-        except TclError, msg:
+        except TclError as msg:
             pass
         self.fp.close()
         self.fp = None