Merged revisions 77727 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r77727 | ezio.melotti | 2010-01-24 18:58:36 +0200 (Sun, 24 Jan 2010) | 1 line

  use assert[Not]IsInstance where appropriate
........
diff --git a/Lib/test/test_threading.py b/Lib/test/test_threading.py
index 8737c3d..b8265aa 100644
--- a/Lib/test/test_threading.py
+++ b/Lib/test/test_threading.py
@@ -154,8 +154,7 @@
         # Wait for the thread to finish.
         mutex.acquire()
         self.assertIn(tid, threading._active)
-        self.assertTrue(isinstance(threading._active[tid],
-                                threading._DummyThread))
+        self.assertIsInstance(threading._active[tid], threading._DummyThread)
         del threading._active[tid]
 
     # PyThreadState_SetAsyncExc() is a CPython-only gimmick, not (currently)