use assert[Not]In where appropriate
diff --git a/Lib/test/test_py3kwarn.py b/Lib/test/test_py3kwarn.py
index 8cb0be9..c35e4b4 100644
--- a/Lib/test/test_py3kwarn.py
+++ b/Lib/test/test_py3kwarn.py
@@ -350,9 +350,9 @@
try:
__import__(module_name, level=0)
except DeprecationWarning as exc:
- self.assertTrue(module_name in exc.args[0],
- "%s warning didn't contain module name"
- % module_name)
+ self.assertIn(module_name, exc.args[0],
+ "%s warning didn't contain module name"
+ % module_name)
except ImportError:
if not optional:
self.fail("Non-optional module {0} raised an "