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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 set_description(self):
 """ Set the node description """

        if self.device_info['type'] == 'Router':
            self.node['description'] = '%s %s' % (self.device_info['type'],
                                                  self.device_info['model'])
        else:
            self.node['description'] = self.device_info['desc']