Hyperdiv is a framework for rapidly developing reactive browser UI apps in Python, with built-in components, terse immediate-mode syntax, and minimal tool boilerplate. Hyperdiv includes the Shoelace component system, markdown support via Mistune, charts via Chart.js, support for reading/writing browser local storage, and forms whose validation logic is implemented in Python.
After playing with some of the demo apps, this looks like a pretty cool library.