I recently worked on a legacy codebase that requires Python2, which has been deprecated for some time and is no longer available via homebrew.
Using this Stack Overflow thread I was able to resolve the issue as below. Note that the “pyenv global” command might interfere with with your Python3 environment.
➜ yarn install --check-files gyp verb command configure  gyp verb check python checking for Python executable "python2" in the PATH gyp verb `which` failed Error: not found: python2 ➜ which python python not found ➜ which python2 python2 not found
➜ brew install pyenv ➜ pyenv install 2.7.18 ➜ pyenv global 2.7.18 ➜ PATH=$(pyenv root)/shims:$PATH ➜ which python2 /Users/user/.pyenv/shims/python2 ➜ yarn install --check-files yarn install v1.22.19 ... Done in 10.26s
Add to ~/.bashrc or ~/.zshrc to make available in future shell sessions:
# make python exe available globally PATH=$(pyenv root)/shims:$PATH