use omz's pyenv plugin

home/.zsh/custom/plugins/pyenv/pyenv.plugin.zsh

@@ -1,37 +0,0 @@
-_homebrew-installed() {
-    type brew &> /dev/null
-}
-
-_pyenv-from-homebrew-installed() {
-    brew --prefix pyenv &> /dev/null
-}
-
-FOUND_PYENV=0
-pyenvdirs=("$HOME/.pyenv" "/usr/local/pyenv" "/opt/pyenv")
-if _homebrew-installed && _pyenv-from-homebrew-installed ; then
-    pyenvdirs=($(brew --prefix pyenv) "${pyenvdirs[@]}")
-fi
-
-for pyenvdir in "${pyenvdirs[@]}" ; do
-    if [ -d $pyenvdir/bin -a $FOUND_PYENV -eq 0 ] ; then
-        FOUND_PYENV=1
-        if [[ $PYENV_ROOT = '' ]]; then
-          PYENV_ROOT=$pyenvdir
-        fi
-        export PATH=${pyenvdir}/bin:$PATH
-        eval "$(pyenv init - zsh)"
-
-        if pyenv commands | command grep -q virtualenv-init; then
-            eval "$(pyenv virtualenv-init - zsh)"
-        fi
-
-        function pyenv_prompt_info() {
-            echo "$(pyenv version-name)"
-        }
-    fi
-done
-unset pyenvdir
-
-if [ $FOUND_PYENV -eq 0 ] ; then
-    function pyenv_prompt_info() { echo "system: $(python -V 2>&1 | cut -f 2 -d ' ')" }
-fi