(python Terminal Toolkit) is a Text-based user interface library (TUI) Evolved from the discontinued project pyCuT and inspired by a mix of Qt5, GTK, and tkinter api definition with a touch of personal interpretation. Self-contained. Starts with all of the basic UI widgets you'd expect. Has specialized and advanced widgets as well but you don't need to use them. Has a QT-like layout system (I don't know if this is good or bad..) Unicode supported. Comes with a bunch of demos to show off what it can do (and act as sample code to show you how to use things).

Advanced things it can do include text mode graphs and charts (with animations), drag-and-drop, tabs, and ANSI graphics.

The online demo is all of the demo code running in Pyodide. Which includes something very much like a Desqview environment...