How can I fix the “zsh: command not found: python” error? (macOS Monterey 12.3, Python 3.10, Atom IDE, and atom-python-run 0.9.7)

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Anyone updating their macOS to Monterey 12.3 will find that they suddenly no longer have the system-provided Python 2.

The reason for this is that Apple removed the system-provided Python 2 installation (details).

So a workaround/solution for this is to use pyenv to install Python 2.7 (or any other specific version you need).

  1. Install pyenv with brew to manage different Python versions: brew install pyenv
  2. List all installable versions with pyenv install --list
  3. Install Python 2.7.18 with pyenv install 2.7.18
  4. List installed versions with pyenv versions
  5. Set global python version with pyenv global 2.7.18
  6. Add eval "$(pyenv init --path)" to ~/.zprofile (or ~/.bash_profile or ~/.zshrc, whichever you need)
  7. Relaunch the shell and check that Python works, or run $ source ~/.zprofile (Thanks masoud soroush!)

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