Message 221998 - Python tracker

diff -r 3b94a4ef244e Lib/test/test_argparse.py
--- a/Lib/test/test_argparse.py	Fri Feb 07 17:53:13 2014 +0100
+++ b/Lib/test/test_argparse.py	Fri Feb 07 22:34:13 2014 +0200
@@ -4219,7 +4219,7 @@
             e = sys.exc_info()[1]
             expected = 'unknown action'
             msg = 'expected %r, found %r' % (expected, e)
-            self.assertTrue(expected in str(e), msg)
+            self.assertIn(expected, str(e), msg)

The patch in issue 9554 replaces this code with assertRaises and assertRegex (I will change the code to use assertRaisesRegex).