How to limit the size of the dictionary- How to limit the size of a dictionary?

problem ：

I'd like to work with a dict in python, but limit the number of key/value pairs to X. In other words, if the dict is currently storing X key/value pairs and I perform an insertion, I would like one of the existing pairs to be dropped. I want to python Use in dict, But will key / The number of value pairs is limited to X. let me put it another way , If dict Currently storing X Key / Value pair and I execute insert , I want one of the existing pairs to delete .It would be nice if it was the least recently inserted/accesses key but that's not completely necessary. If it is the least recently inserted / Just access the key , But this is not absolutely necessary .

If this exists in the standard library please save me some time and point it out! If this exists in the standard library , Please save me some time and point it out ！

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Solution ：

Reference resources ： https://stackoom.com/en/question/AE8P