pyenv-local-version.zsh

# Registers a hook when changing directory to find out the
# local pyenv version in it. Exporting it as PYENV_LOCAL_VERSION.
#
# Note that it's meant to only detect those directories using a .python-version
#

update-pyenv-local-version() {
    # This will return something like "my-version (set by /path/to/.python-version)"
    local version="`pyenv version`"
    if [[ $version == *.python-version* ]]; then
		export PYENV_LOCAL_VERSION=${version[(ws: :)1]}
	else
		export PYENV_LOCAL_VERSION=""
	fi
}

autoload -U add-zsh-hook
add-zsh-hook chpwd update-pyenv-local-version