How to call a method / function periodically? (time.sleep fails) [duplicate]

Answer 1

Instead of time.sleep try using after in the following way as it won't delay your GUI to show:

import tkinter as tk


def update():
    global each, limit, period, widget
    if each < limit:
        widget['text'] = each
        each += 1
        widget.after(period*1000, update)

root = tk.Tk()

widget = tk.Label(root, text="Initial text")
widget.pack()


limit = 3
period = 1
each = 0

update()

root.mainloop()