Qt for Python (PySide/Shiboken)

hi, can anybody give some tips in the following example? I have a main window, there you can choose between two words to generate an object that you can "play" with in a new window (you can play with objects at once, i.e multiple windows), after all windows are closed, you can generate a json with all object features. When I was working with tkinter, I had every object in memory and keep track of them using a hidden ID in the window, but I think there's an easier approach, how would you tackle this problem? I was thinking in passing the QtObject to every window and send a signal with this QtObject back to the main window and add to a list used later to generate the json.