convert old fail* assertions to assert*
diff --git a/Lib/test/test_opcodes.py b/Lib/test/test_opcodes.py
index 4403a11..8b7fd9e 100644
--- a/Lib/test/test_opcodes.py
+++ b/Lib/test/test_opcodes.py
@@ -60,7 +60,7 @@
 
         try:  raise DClass(a)
         except DClass as v:
-            self.assert_(isinstance(v, DClass))
+            self.assertTrue(isinstance(v, DClass))
         else:
             self.fail("no exception")