import tkinter as tk
import time
root=tk.Tk()
label1=tk.Label(text='hello',font='Calibri 25')
label1.pack()
time.sleep(3)
label1.configure(bg='green')
root.mainloop()
Again and again I say only I want to place label1 and after 3 seconds I want to change the background color but it doesnt work. Can you explain me the main problem and what can I do?