我在使用 brew 时遇到了 openssl 和 python@2 问题，这里已经解释了（未解决）。重新安装 Python 和 openssl 的文档化解决方法不起作用，所以我决定卸载并重新安装 Python。
问题是，当您尝试使用 brew 安装 Python 2 时，您会收到以下消息：
brew install python@2
Error: No available formula with the name "python@2"
==> Searching for a previously deleted formula (in the last month)...
Warning: homebrew/core is shallow clone. To get complete history run:
git -C "$(brew --repo homebrew/core)" fetch --unshallow
python@2 was deleted from homebrew/core in commit 028f11f9e:
python@2: delete (https://github.com/Homebrew/homebrew-core/issues/49796)
EOL 1 January 2020.
We gave it 1 month more …