Python3.6之前，dict是无序的，但Python3.6之后，dict的底层数据结构发生了改变
即可以保证顺序，又可以减少内存占用，提高效率
- https://blog.csdn.net/weixin_43141320/article/details/104777111
- https://blog.csdn.net/weixin_44716687/article/details/105943702
- https://blog.csdn.net/turingbooks/article/details/102512792?utm_medium=distribute.pc_relevant_t0.none-task-blog-OPENSEARCH-1&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-OPENSEARCH-1
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