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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 command_path(self):
 """The computed command path. This is used for the ``usage`` information on the help page. It's automatically created by combining the info names of the chain of contexts to the root. """

        rv = ''
        if self.info_name is not None:
            rv = self.info_name
        if self.parent is not None:
            rv = self.parent.command_path + ' ' + rv
        return rv.lstrip()