如何在Web应用程序中使Python对象持久化？

I'm writing a reasonably complex web application. The Python backend runs an algorithm whose state depends on data stored in several interrelated database tables which does not change often, plus user specific data which does change often. The algorithm's per-user state undergoes many small changes as a user works with the application. This algorithm is used often during each user's work to make certain important decisions.I'm writing a reasonably complex web applicatio