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python 的 set 和其他语言类似, 是一个无序不重复元素集, 基本功能包括关系测试和消除重复元素。 set 和 dict 类似,但是 set 不存储 value 值的。 传入的参数 [123,456,789] 是一个 list,而显示的 {456, 123, 789} 只是告诉你这个 set 内部有 456, 123, 789 这 3 个元素,显示的顺序 ...
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