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__getitem__和__setitem__
2022-06-28 02:07:00 【xx_xjm】
这里__setitem__和__setattr__有点相似，一个是在“对象.属性”的时候调用，一个是在“对象[item]”的时候调用
与__setattr__一样，设置属性要么用self.__dict__,要么用object（self, key，value)
两者差别在于，一个是a.属性的时候调用，一个是a[属性]的时候调用，a是任一个类的实例
参考自：(12条消息) python中 __setitem__（）和 __setattr__（）的区别_MY Qi的博客-CSDN博客
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