use assert[Not]In where appropriate
diff --git a/Lib/test/test_exceptions.py b/Lib/test/test_exceptions.py
index 3a2bdf5..b97affb 100644
--- a/Lib/test/test_exceptions.py
+++ b/Lib/test/test_exceptions.py
@@ -428,7 +428,7 @@
                     return sys.exc_info()
             e, v, tb = g()
             self.assertTrue(e is RuntimeError, e)
-            self.assertTrue("maximum recursion depth exceeded" in str(v), v)
+            self.assertIn("maximum recursion depth exceeded", str(v))