Get system disk space usage.

        :return: :class:`system.Space <system.Space>` object
        :rtype: system.Space

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)