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/plat-mac/terminalcommand.py

@@ -35,7 +35,7 @@ def run(command):
 
     try:
         theEvent.AESend(SEND_MODE, kAENormalPriority, kAEDefaultTimeout)
-    except AE.Error, why:
+    except AE.Error as why:
         if why[0] != -600:  # Terminal.app not yet running
             raise
         os.system(START_TERMINAL)