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_userdict.py b/Lib/test/test_userdict.py
index 447f434..25aa307 100644
--- a/Lib/test/test_userdict.py
+++ b/Lib/test/test_userdict.py
@@ -168,7 +168,7 @@
         e = E()
         try:
             e[42]
-        except RuntimeError, err:
+        except RuntimeError as err:
             self.assertEqual(err.args, (42,))
         else:
             self.fail_("e[42] didn't raise RuntimeError")
@@ -180,7 +180,7 @@
         f = F()
         try:
             f[42]
-        except KeyError, err:
+        except KeyError as err:
             self.assertEqual(err.args, (42,))
         else:
             self.fail_("f[42] didn't raise KeyError")
@@ -189,7 +189,7 @@
         g = G()
         try:
             g[42]
-        except KeyError, err:
+        except KeyError as err:
             self.assertEqual(err.args, (42,))
         else:
             self.fail_("g[42] didn't raise KeyError")