Hi,
Welcome to our forum. This forum scope is to support people that have questions regarding our API, you can have a look at our scope on this page. (Coding with python or c++)
If by Xpresso you mean, having a python node inside your Xpresso and you have a question regarding our API, the Cinema 4D SDK category is the place to ask your question.
If your question is how to use or build an Xpresso setup, you can contact our regular support, they might have some suggestion about where you can talk/ask your questions.
Cheers,
Manuel