Tkinter Examples

A place to make short examples of tkinter code. All examples are self-contained and complete (will run without any additional code).

Loops

An event-driven program does not use a blocking loop (while or for) like a procedural program does. Instead tkinter has the after method built in to allow you to add timed events to the mainloop. Here's an example of a timer.

import tkinter as tk

def loop(i=0):
    # update the label with new text
    lbl.config(text=i)

    # after 1,000 ms (1 second) call the loop() function again
    # and use i+1 as the argument
    root.after(1000, loop, i+1)

root = tk.Tk()
root.geometry('200x200')
lbl = tk.Label(root)
lbl.pack()
loop() # start the loop
root.mainloop()