convert usage of fail* to assert*
diff --git a/Lib/test/test_opcodes.py b/Lib/test/test_opcodes.py
index 7985bf6..c03ca1d 100644
--- a/Lib/test/test_opcodes.py
+++ b/Lib/test/test_opcodes.py
@@ -64,7 +64,7 @@
 
         try:  raise DClass, a
         except DClass, v:
-            self.assert_(isinstance(v, DClass))
+            self.assertTrue(isinstance(v, DClass))
         else:
             self.fail("no exception")