Auto load python virtual env and rename tmux window using zsh

.zshrc

# chpwd is a zsh hook, wich is executed after change directory
# More info: http://zsh.sourceforge.net/Doc/Release/Functions.html
function chpwd() {
  if [ -z "$VIRTUAL_ENV" ]; then
    # If exists a virtualenv with name of directory, load it!
    workon ${PWD##*/} 2> /dev/null
  else
    # If a virtual env are loaded, rename window with they name
    TMUX_WINDOW_NAME=$(tmux display-message -p '#W')
    if [ $TMUX_WINDOW_NAME != ${VIRTUAL_ENV##*/} ]; then
      tmux rename-window ${VIRTUAL_ENV##*/} ; 
    fi
  fi
}