test_argparse.py 文件源码

def test_argument_type_error(self):

        def spam(string):
            raise argparse.ArgumentTypeError('spam!')

        parser = ErrorRaisingArgumentParser(prog='PROG', add_help=False)
        parser.add_argument('x', type=spam)
        try:
            parser.parse_args(['XXX'])
        except ArgumentParserError:
            expected = 'usage: PROG x\nPROG: error: argument x: spam!\n'
            msg = sys.exc_info()[1].stderr
            self.assertEqual(expected, msg)
        else:
            self.fail()

# ======================
# parse_known_args tests
# ======================