<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def demo_args(self):
 """ Additional method for replacing input arguments by demo ones. """

        argv = random.choice(self.examples).replace("--demo", "")
        self._reparse_args['pos'] = shlex.split(argv)