List all available commands
List all Python versions under the `${PYENV_ROOT}/versions` directory
List all Python versions that can be installed from upstream
Install a Python version under the `${PYENV_ROOT}/versions` directory
Uninstall a Python version under the `${PYENV_ROOT}/versions` directory
Set Python version to be used globally in the current machine
Set Python version to be used in the current directory and all directories below it