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/test/test_set.py b/Lib/test/test_set.py
index 9bd0d43..0d08b79 100644
--- a/Lib/test/test_set.py
+++ b/Lib/test/test_set.py
@@ -332,7 +332,7 @@
         for v1 in ['Q', (1,)]:
             try:
                 self.s.remove(v1)
-            except KeyError, e:
+            except KeyError as e:
                 v2 = e.args[0]
                 self.assertEqual(v1, v2)
             else: