Why are multiple instances of Tk discouraged?

Question

Consider below example:

import tkinter as tk

root = tk.Tk()
root.title(\"root\")

other_window = tk.Tk()
other_window.title(\"other_window\")

root.mainloop         


        

Answer 1

The best reference I've found so far is this section in the tkinterbook.

In the simple examples we’ve used this far, there’s only one window on the screen; the root window. This is automatically created when you call the Tk constructor

and

If you need to create additional windows, you can use the Toplevel widget. It simply creates a new window on the screen, a window that looks and behaves pretty much like the original root window

My take on it is that a Tk instance creates a Toplevel widget, plus things like the mainloop, of which there should be only one.