support skip-virtualenvwrapper-init zstyle in python module to avoid auto-sourcing of virtualenvwrapper.sh

modules/python/init.zsh

@@ -34,8 +34,9 @@ if (( ! $+commands[python] && ! $+commands[pyenv] )); then
   return 1
 fi
 
-# Load virtualenvwrapper into the shell session.
-if (( $+commands[virtualenvwrapper.sh] )); then
+# Load virtualenvwrapper into the shell session, unless requested not to
+zstyle -t ':prezto:module:python' skip-virtualenvwrapper-init
+if (( $? && $+commands[virtualenvwrapper.sh] )); then
   # Set the directory where virtual environments are stored.
   export WORKON_HOME="$HOME/.virtualenvs"