> For the complete documentation index, see [llms.txt](https://dinoin.gitbook.io/shi-py-bu-shi-pi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dinoin.gitbook.io/shi-py-bu-shi-pi/zhuang-shi-han-shu.md).

# 裝飾函数

返回第一次執行取得的值，而不是再次计算它(避免效能低卻不用更新的取值函數重複執行)。

> <https://fastapi.tiangolo.com/zh/advanced/settings/#lru_cache>