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/Lib/pty.py b/Lib/pty.py
index d3eb64f..8c65313 100644
--- a/Lib/pty.py
+++ b/Lib/pty.py
@@ -56,7 +56,7 @@
     else:
         try:
             tty_name, master_fd = sgi._getpty(os.O_RDWR, 0666, 0)
-        except IOError, msg:
+        except IOError as msg:
             raise os.error, msg
         return master_fd, tty_name
     for x in 'pqrstuvwxyzPQRST':