pip 的 `--no-cache-dir` 有什麼用？ - What is pip's `--no-cache-dir` good for?

問題：

I've recently seen the --no-cache-dir being used in a Docker file.我最近看到 Docker 文件中使用了--no-cache-dir 。 I've never seen that flag before and the help is not explaining it:我以前從未見過那個標誌，幫助也沒有解釋它：

 --no-cache-dir              Disable the cache.

1. Question: What is cached?問題：緩存是什麼？
2. Question: What is the cache used for?問題：緩存有什麼用？
3. Question: Why would I want to disable it?問題：我爲什麼要禁用它？

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解決方案：

參考一： https://en.stackoom.com/question/35JGV
參考二： https://stackoom.com/question/35JGV