How to continue programm after closing tkinter-window in python?

July 27, 2023

I got a problem with two tkinter windows which I simplified as follows:

import tkinter as tk

def function_2(): # creates Window 2
    root2 = tk.Tk()
    # some buttons targeting other functions
    root2.mainloop()
    print(1) # just a placeholder for some other code

def function_1(): # creates Window 1
    root = tk.Tk()
    funtcion_2()
    root.mainloop()

function_1()

I want the "print(1)" in function_2 to be executed after I close window 2, which is created in function_2, manually by clicking the X in the upper right corner of a Windows windows. However the output "1" won’t show up as long as I don’t close window 1 as well.
What shall I do to get the desired result?

Thanks in advance!

I already tried Threading cause I thought the code in function_2 seems to ‘wait’ until everything in function_1 is executed.
I also tried

root2.protocol("WM_DELETE_WINDOW", lambda: root2.destroy())

underneath the line

root2 = tk.Tk()

in function_2. But the result is the same: I don’t return to function_1 after closing window 2.

>Solution :

It is recommended that mainloop() should be called once. Also avoid using multiple instances of Tk().

For your case, use root2.wait_window() instead of root2.mainloop():

def function2(): # creates Window 2
    root2 = tk.Tk()
    # some buttons targeting other functions
    root2.wait_window() # wait for closing of root2
    print(1)

Note that there are typos in your code: