How I did it:
t = Tk() # new window
t.update()
t.attributes("-alpha", 00)
t.state('zoomed') # maximize the window
height= t.winfo_height() # ...
width= t.winfo_width()
But sadly I do not know of the location of the other screen. But I think you can do this
- create a new window
- use winfo_screenheight() and winfo_screenwidth() to find out about the original screen
- use geometry() to move the window around
- maximize the window (it should always maximize at the screen where it is)
- get geometry()
- if geometry is at (0, 0) it is the main screen, proceed with 3.
- you found another screen