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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 subparsers(self):
 """Obtain the subparser's object."""

        try:
            return self.__subparsers
        except AttributeError:
            parent = super(ArgumentParser, self)
            self.__subparsers = parent.add_subparsers(title="drill down")
            self.__subparsers.metavar = "COMMAND"
            return self.__subparsers