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

Doc/lib/libsubprocess.tex

@@ -284,7 +284,7 @@ try:
         print >>sys.stderr, "Child was terminated by signal", -retcode
     else:
         print >>sys.stderr, "Child returned", retcode
-except OSError, e:
+except OSError as e:
     print >>sys.stderr, "Execution failed:", e
 \end{verbatim}