def main(args=None):

    warn_about_missing_assertion()

    if args is None:

        args = py.std.sys.argv[1:]

    config = py.test.config

    config.parse(args)

    session = config.initsession()

    try: 

        failures = session.main()

        if failures: 

            raise SystemExit, 1 

    except KeyboardInterrupt: 

        if not config.option.verbose: 

            print

            print "KeyboardInterrupt (-v to see traceback)"

            raise SystemExit, 2

        else: 

            raise