oh-my-zsh/plugins/pyenv/pyenv.plugin.zsh

# This plugin loads pyenv into the current shell and provides prompt info via
# the 'pyenv_prompt_info' function. Also loads pyenv-virtualenv if available.

if (( $+commands[pyenv] )); then
    eval "$(pyenv init - zsh)"
    if (( $+commands[pyenv-virtualenv-init] )); then
        eval "$(pyenv virtualenv-init - zsh)"
    fi
    function pyenv_prompt_info() {
        echo "$(pyenv version-name)"
    }
else
    # fallback to system python
    function pyenv_prompt_info() {
        echo "system: $(python -V 2>&1 | cut -f 2 -d ' ')"
    }
fi