use assert[Not]IsInstance where appropriate
diff --git a/Lib/test/test_urllib2.py b/Lib/test/test_urllib2.py
index d5918b9..30b7649 100644
--- a/Lib/test/test_urllib2.py
+++ b/Lib/test/test_urllib2.py
@@ -580,12 +580,12 @@
                 # *_request
                 self.assertEqual((handler, name), calls[i])
                 self.assertEqual(len(args), 1)
-                self.assertTrue(isinstance(args[0], Request))
+                self.assertIsInstance(args[0], Request)
             else:
                 # *_response
                 self.assertEqual((handler, name), calls[i])
                 self.assertEqual(len(args), 2)
-                self.assertTrue(isinstance(args[0], Request))
+                self.assertIsInstance(args[0], Request)
                 # response from opener.open is None, because there's no
                 # handler that defines http_open to handle it
                 self.assertTrue(args[1] is None or