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/plat-mac/macresource.py b/Lib/plat-mac/macresource.py
index d5839a1..91dfffa 100644
--- a/Lib/plat-mac/macresource.py
+++ b/Lib/plat-mac/macresource.py
@@ -76,14 +76,14 @@
     AppleSingle file"""
     try:
         refno = Res.FSpOpenResFile(pathname, 1)
-    except Res.Error, arg:
+    except Res.Error as arg:
         if arg[0] in (-37, -39):
             # No resource fork. We may be on OSX, and this may be either
             # a data-fork based resource file or a AppleSingle file
             # from the CVS repository.
             try:
                 refno = Res.FSOpenResourceFile(pathname, u'', 1)
-            except Res.Error, arg:
+            except Res.Error as arg:
                 if arg[0] != -199:
                     # -199 is "bad resource map"
                     raise
@@ -103,14 +103,14 @@
     try:
         refno = Res.FSpOpenResFile(pathname, 1)
         Res.CloseResFile(refno)
-    except Res.Error, arg:
+    except Res.Error as arg:
         if arg[0] in (-37, -39):
             # No resource fork. We may be on OSX, and this may be either
             # a data-fork based resource file or a AppleSingle file
             # from the CVS repository.
             try:
                 refno = Res.FSOpenResourceFile(pathname, u'', 1)
-            except Res.Error, arg:
+            except Res.Error as arg:
                 if arg[0] != -199:
                     # -199 is "bad resource map"
                     raise