I wanted to confirm that PyPy's applevel tests are indeed passing in CPython, and discovered this: pypy/module/test/test_builtin.py test_xrange_args tests start/stop/step attribute of xrange object. But these attributes got deprecated in 2.2, and is not present in 2.3 or 2.4... Well, that test is still useful though. By the way, is there already a tool to run applevel tests on CPython? Seo Sanghyeon