Fix: Don't force ~/.virtualenvs as WORKON_HOME

modules/python/init.zsh

@@ -37,7 +37,9 @@ fi
 # Load virtualenvwrapper into the shell session.
 if (( $+commands[virtualenvwrapper.sh] )); then
   # Set the directory where virtual environments are stored.
-  export WORKON_HOME="$HOME/.virtualenvs"
+  if [[ -z $WORKON_HOME ]]; then
+    export WORKON_HOME="$HOME/.virtualenvs"
+  fi
 
   # Disable the virtualenv prompt.
   VIRTUAL_ENV_DISABLE_PROMPT=1