加载数据集的时候经常用到def __getitem__(self, index):具体怎么理解它呢？ - 知乎
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1 __getitem__函数的作用是什么？ 是更为方便引用数据。参考@留德华叫兽 的答案，__getitem__函数的作用是方便采用 实例[下标] 这种更为方便的方式，如果不用__getitem__函数，实例[下标]这种方式是不允许的，需要用实例.函数(下标)的方式引用，例如： building1.get_floor_data(2)。
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