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I'm in Python37, on windows 10, working in tkinter and I've written a function did_file_update that is constantly scanning the desktop every 10 seconds to see if the file "test.txt" has changed. There is also a function abort_window_call that creates a window with a red "ABORT" button. I'm trying to write a script that will thread the two functions, and allow me to click the "ABORT" button and terminate the script once the "START" button has been pressed and did_file_update has been called.

import os
import time
import threading
import tkinter as tk
from tkinter import messagebox
import tkinter.messagebox as msg
from tkinter import Button, Message, Tk


global path_to_watch
path_to_watch = "C:\Users\Desktop"

class App():
 def __init__(self):
 pass

 def abort_window_call(self):
 abort_window = Tk()
 abort_window.title("Would you like to abort?")
 abort_window.geometry('50x90+200+200')
 abort_button = tk.Button(abort_window, text='ABORT', font=('century gothic', 24),
 bg='red', fg='white', height=1, width=5,
 relief='raised', command=lambda: abort_window.destroy())
 abort_button.pack(padx=10, pady=5)

 abort_window.mainloop()

 def did_file_update(self):
 statinfo_before = os.stat("C:\Users\Desktop\test.txt")
 statinfo_size_before = statinfo_before.st_size

 while 1:
 time.sleep (10)
 statinfo_after = os.stat("C:\Users\Desktop\test.txt")
 statinfo_size_after = statinfo_after.st_size
 if statinfo_size_after != statinfo_size_before:
 print("Updated: test.txt")
 statinfo_size_before = statinfo_size_after
 break
 else:
 pass

 def main(self):
 master = Tk()
 ws = master.winfo_screenwidth()
 hs = master.winfo_screenheight()
 x = (ws/2) - (180)
 y = (hs/2) - (70)
 master.title("File Update")
 master.geometry('360x140+%d+%d' % (x, y))
 msg = Message(master, text = "FILE UPDATE", width=700)
 msg.config(font=('century gothic', 28))
 msg.grid(row=3, column=0)

 start_button = tk.Button(master, text='START', font=('century gothic', 24),
 bg='green', fg='white', height=1, width=17,
 relief='raised', command=self.did_file_update)
 start_button.grid(row=1, column=0, sticky='n', padx=10, pady=5)

 master.mainloop()

app=App()

t = threading.Thread(target = app.abort_window_call)
t1 = threading.Thread(target = app.main)

t.start()
t1.start()

tl;dr How do I make the abort_window_call function terminate the whole program, even after "START" has been pressed and the function did_file_update is running?