Tkinter - Multiple Windows from different modules

[Todd Lichty]

I am trying to show two windows on the screen with them existing in
different modules. I.e.

ModuleA.py

class A:
    def __init__(self):
        root = Tk()
        ...setup window...
        root.mainloop()

    def showOtherWindow()
        x = ModuleB.b()
        ...do stuff with info returned...

ModuleBB.py:

class B:
    def __init__(self):
        root = Tk()
        ...setup window...
        root.mainloop()

What I want to happen is that when window B is closed, the focu returns to
window A and the code in showOtherWindow continues executing.

Thanks in advance,

Todd