use assert[Not]IsInstance where appropriate
diff --git a/Lib/test/test_compiler.py b/Lib/test/test_compiler.py
index b9033a8..937f000 100644
--- a/Lib/test/test_compiler.py
+++ b/Lib/test/test_compiler.py
@@ -110,7 +110,7 @@
 
     def _check_lineno(self, node):
         if not node.__class__ in NOLINENO:
-            self.assertTrue(isinstance(node.lineno, int),
+            self.assertIsInstance(node.lineno, int,
                 "lineno=%s on %s" % (node.lineno, node.__class__))
             self.assertTrue(node.lineno > 0,
                 "lineno=%s on %s" % (node.lineno, node.__class__))