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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def do_up(self,args):
 """ Navigate up by one level. up -h for more details """

        parser = CommandArgumentParser("up")
        args = vars(parser.parse_args(args))
        if None == self.parent:
            print "You're at the root. Try 'quit' to quit"
        else:
            return True