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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 space(self):
 """Get system disk space usage. :return: :class:`system.Space <system.Space>` object :rtype: system.Space """

        schema = SpaceSchema()
        resp = self.service.get(self.base+'space/')
        return self.service.decode(schema, resp)