use assert[Not]In where appropriate
diff --git a/Lib/test/test_scope.py b/Lib/test/test_scope.py
index cf30ff9..76ab192 100644
--- a/Lib/test/test_scope.py
+++ b/Lib/test/test_scope.py
@@ -505,8 +505,8 @@
             return C
 
         varnames = f(1).z
-        self.assertTrue("x" not in varnames)
-        self.assertTrue("y" in varnames)
+        self.assertNotIn("x", varnames)
+        self.assertIn("y", varnames)
 
     def testLocalsClass_WithTrace(self):
         # Issue23728: after the trace function returns, the locals()