use assert[Not]In where appropriate
diff --git a/Lib/test/test_profile.py b/Lib/test/test_profile.py
index 0016d51..fe88d12 100755
--- a/Lib/test/test_profile.py
+++ b/Lib/test/test_profile.py
@@ -57,7 +57,7 @@
             stats = pstats.Stats(prof, stream=s)
             stats.print_stats()
             res = s.getvalue()
-            self.assertTrue(self.expected_list_sort_output in res,
+            self.assertIn(self.expected_list_sort_output, res,
                 "Profiling {0!r} didn't report list.sort:\n{1}".format(stmt, res))