I'm looking for reactive state libraries like Mobx for Python, i.e. on server-side rather than client-side of a web application.
Mobx is similar to classic reactive libraries like RxPY, but has a different focus: It is not so much avout the low-level event dispatching, but reacting on data changes, recalculating derived values (but only those affected, and being lazy on non-observed dependent values). And Mobx determines dependencies of calculated values automatically.
Also, the Vue framework has such functionality built-in, with an even better syntax, with the upside (as well as downside) by being closely tied to the framework.
Alas, both are JavaScript and targeted at client-side / user interface.
So my specific questions are:
I did one. It's called MoPyX. It's toolkit independent so you can just observe objects. But is geared towards UIs.
See: https://github.com/germaniumhq/mopyx
PySide2 demo: https://github.com/germaniumhq/mopyx-sample