macOS 12.3更新删除了Python 2，代之以版本3:
https://developer.apple.com/documentation/macos-release-notes/macos-12_3-release-notes
python
我知道我们需要迁移到版本3，但同时我们仍然需要版本2.brew 软件似乎不再有了:
brew install python@2.7
Warning: No available formula with the name "python@2.7". Did you mean python@3.7, python@3.9, python@3.8, python@3.10 or python-yq?
brew install python2
Warning: No available formula with the name "python2". Did you mean ipython, bpython, jython or cython?
有什么好处？