Tkinter root windows have a method called
after which can be used to schedule a function to be called after a given period of time. If that function itself calls
after you’ve set up an automatically recurring event.
Here is a working example:
# for python 3.x use 'tkinter' rather than 'Tkinter' import Tkinter as tk import time class App(): def __init__(self): self.root = tk.Tk() self.label = tk.Label(text="") self.label.pack() self.update_clock() self.root.mainloop() def update_clock(self): now = time.strftime("%H:%M:%S") self.label.configure(text=now) self.root.after(1000, self.update_clock) app=App()
Bear in mind that
after doesn’t guarantee the function will run exactly on time. It only schedules the job to be run after a given amount of time. It the app is busy there may be a delay before it is called since Tkinter is single-threaded. The delay is typically measured in microseconds.