Early prototyping will target using Qt Creator/Designer to create .ui files that will transpile to Python. This should be somewhat similar to the forms editor including with most Microsoft products which I believe most contributors have mostly leaned on. This will be the basis for the UI. Quick tutorial here (getting it setup, creating a basic main window, compiling to Python, and running): https://wiki.qt.io/QtCreator_and_PySide
I don't recall when I was last working on this or the target base implementation, but some work was completed and can be seen in the Python branch under the ui folder.
The Python implementation will utilize PySide (or PyQt, but PySide has the favorable license): https://github.com/PySide
I would recommend the original PySide over PySide2, because I believe PySide2 is still a work in progress.
Tutorials: https://wiki.qt.io/PySide_Tutorials
Early prototyping will target using Qt Creator/Designer to create .ui files that will transpile to Python. This should be somewhat similar to the forms editor including with most Microsoft products which I believe most contributors have mostly leaned on. This will be the basis for the UI. Quick tutorial here (getting it setup, creating a basic main window, compiling to Python, and running): https://wiki.qt.io/QtCreator_and_PySide
I don't recall when I was last working on this or the target base implementation, but some work was completed and can be seen in the Python branch under the ui folder.