[Python] Putting a Tkinter window below all other windows

I'm trying to make a Tkinter window appear below all other windows.

I know how to make it appear over all other windows:

import tkinter as tk

root = tk.Tk()
root.attributes('-topmost', True)
root.mainloop()


But I'm trying to do the opposite of that - so that the window sits under all windows, on the desktop. -bottommost isn't a thing though, sadly.

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