http://bugs.python.org/review/25111/diff/15571/Lib/test/test_traceback.py File Lib/test/test_traceback.py (right): http://bugs.python.org/review/25111/diff/15571/Lib/test/test_traceback.py#new... Lib/test/test_traceback.py:660: self.assertEqual(f, tuple(f)) I don't understand why you test "f == tuple(f)" and "tuple(f) == f". It isn't the same? Just a comment to explain why.