Ongoing event in tkinter

问题

Using tkinter, can I bind an ongoing event to activate while the mainloop still goes off? Means it executes the same command over and over until the program is closed

回答1:

you can use root.after to run a function repeatedly like so:

def repeat_task():
    # do stuff
    root.after(10, repeat_task)

this will constantly do something, and then run itself. the delay time shouldn't be 0 because it may not let tkinter's event loop process other events and will freeze. it will go until the window is closed.

回答2:

You can also use threading approach:

import tkinter as tk
import threading

def myLoop():
    print("Hey I am looping!")
    threading.Timer(1, myLoop).start()

window = tk.Tk()
button = tk.Button(window, text = 'Threading', command = lambda: threading.Timer(1, myLoop).start()) 
button.pack()
window.mainloop()

• threading.Timer is an object that will run parallel to your GUI so it won't freeze it.
• threading.Timer will fire up every Nth second that you can specify in the constructor.

来源：https://stackoverflow.com/questions/65817918/ongoing-event-in-tkinter