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3.7. 更新集合中的资源
要更新一个资源，您需要先从集合中获得它，然后修改所需的参数，为资源调用
update 方法来保存所做的修改。对参数的修改操作是通过使用所获取的资源的 set_* 方法进行的。
例 3.7. 更新资源
在这个示例中，名为
DemoDataCenter 的数据中心的描述信息被更新。
dc = api.datacenters.get("DemoDataCenter")
dc.set_description("This data center description provided using the Python SDK")
dc.update()
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