Python的string模块包含多种字符串操作方法，其中format方法用于格式化字符串输出。 1、 参数按默认顺序排列，无需指定位置。 2、 参数设定对应位置，位置即为索引。 3、 参数可在字符串中多次引用，并通过指定位置进行设置。 4、 可像字典一样通过参数名来引用参数。

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