原文地址：https://stackoverflow.com/questions/60298514/brew-reinstalling-python2

起因：在mac上想安装python，通过brew search python查找,结果发现只提供了python3:

通过下面的命令可以安装python2:

brew install https://raw.githubusercontent.com/Homebrew/homebrew-core/86a44a0a552c673a05f11018459c9f5faae3becc/Formula/python@2.rb