.after(delay, callback=None)
is a method defined for all tkinter widgets. This method simply calls the function callback
after the given delay
in ms. If no function is given, it acts similar to time.sleep
(but in milliseconds instead of seconds)
Here is an example of how to create a simple timer using after
:
# import tkinter
try:
import tkinter as tk
except ImportError:
import Tkinter as tk
class Timer:
def __init__(self, parent):
# variable storing time
self.seconds = 0
# label displaying time
self.label = tk.Label(parent, text="0 s", font="Arial 30", width=10)
self.label.pack()
# start the timer
self.label.after(1000, self.refresh_label)
def refresh_label(self):
""" refresh the content of the label every second """
# increment the time
self.seconds += 1
# display the new time
self.label.configure(text="%i s" % self.seconds)
# request tkinter to call self.refresh after 1s (the delay is given in ms)
self.label.after(1000, self.refresh_label)
if __name__ == "__main__":
root = tk.Tk()
timer = Timer(root)
root.mainloop()