如何退出“window.after”循环？

Question

I'm trying to understand how to exit from a "loop", I made this code in Tkinter just to understand, when i press start the loop begins and it repeats the 3 prints every 1 second. Is it possible to exit from the start loop pressing the stop button in some way?

from tkinter import *
cycle = True
def start():
    if cycle == True:
        print("1")
        window.after(1000,start)
    cycle = True
def stop():
    global cycle
    cycle = False
window = Tk()
window.geometry("200x200")
button1 = Button(window,text="Start",command=start)
button1.pack()
button2 = Button(window,text="Stop",command=stop)
button2.pack()
window.mainloop()

Answer 1

I solved the problem by adding an extra function and calling the function before mainloop().

from tkinter import *


cycle = True

def print_text():
   if cycle:
      print("Hello World")
   window.after(1000, print_text)

   
def start():
    global cycle
    cycle = True

    
def stop():
    global cycle
    cycle = False

    
window = Tk()
window.geometry("200x200")
button1 = Button(window,text="Start",command=start)
button1.pack()
button2 = Button(window,text="Stop",command=stop)
button2.pack()

window.after(1000, print_text)

window.mainloop()