如何从 Homebrew 重新安装 python@2？

我在使用 openssl 和 python@2 时遇到了问题，这里已经解释了（未解决）。记录的重新安装 Python 和 openssl 的解决方法不起作用，因此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 to live so that people had time to migrate.
  All in all, developers had 11 years to do their migration.
  You can use the `brew extract` command and maintain python@2 in your own
  tap if necessary:
  https://docs.brew.sh/How-to-Create-and-Maintain-a-Tap

To show the formula before removal run:
  git -C "$(brew --repo homebrew/core)" show 028f11f9e^:Formula/[email protected]

If you still use this formula consider creating your own tap:
  https://docs.brew.sh/How-to-Create-and-Maintain-a-Tap

不幸的是，我仍然有许多依赖于 Brew 的 python@2 的 Brew 公式。这些包括awscli, letsencrypt, pr sshuttle例如

aws
zsh: /usr/local/bin/aws: bad interpreter: /usr/local/opt/python@2/bin/python2.7: no such file or directory

我不知道如何使用这个brew extract他们记录了重新安装 Python@2 的命令。它需要一个公式和一个水龙头。我想公式是python@2。我不确定水龙头需要什么。

另外重新安装水龙头，例如aws or letsencrypt也不太好用。

重新安装后awscli (brew reinstall awscli），运行 aws 命令仍然会出现错误。

aws
/usr/local/Cellar/awscli/2.0.0/libexec/lib/python3.8/site-packages/jmespath/visitor.py:32: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if x is 0 or x is 1:
/usr/local/Cellar/awscli/2.0.0/libexec/lib/python3.8/site-packages/jmespath/visitor.py:32: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if x is 0 or x is 1:
/usr/local/Cellar/awscli/2.0.0/libexec/lib/python3.8/site-packages/jmespath/visitor.py:34: SyntaxWarning: "is" with a literal. Did you mean "=="?
  elif y is 0 or y is 1:
/usr/local/Cellar/awscli/2.0.0/libexec/lib/python3.8/site-packages/jmespath/visitor.py:34: SyntaxWarning: "is" with a literal. Did you mean "=="?
  elif y is 0 or y is 1:
/usr/local/Cellar/awscli/2.0.0/libexec/lib/python3.8/site-packages/jmespath/visitor.py:260: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if original_result is 0:
usage: aws [options] <command> <subcommand> [<subcommand> ...] [parameters]
To see help text, you can run:

  aws help
  aws <command> help
  aws <command> <subcommand> help
aws: error: the following arguments are required: command

您可以使用pyenv安装 python：

brew install pyenv
pyenv install 2.7.18

（可选）将其设置为全局默认值：

pyenv global 2.7.18

好文章关于为什么使用pyenv比使用更好brew管理你的 python 安装。

To make python全局可用的二进制文件，将垫片添加到 PATH：

PATH=$(pyenv root)/shims:$PATH