如何在Python3中获取几天前的时间，云计计算几天前并转换为指定格式，首先获得时间数组格算开式的日期，然后转换为时间戳，接着转换为其他字符串格发实式。
实例一
执行以上代码输出结果为：
实例二
执例：行以上代码输出结果为：
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