Full screen clock on computer monitor

Project - to display the clock on the computer screen. Can be used as wallpaper.

from tkinter import *
from time import strftime
import time

window = Tk()
window.configure(background = 'black')
window.bind('<Escape>', lambda e: window.destroy())
window.attributes ('-fullscreen', True)

time1 = ''

w= 'white'
b='black'

clock = Label(window, bg = b, fg = w, font=('calibri light bold', 110))
clock.pack(padx=100, pady=400)
 
def tik_tak():
    global time1  get the current local time from the PC
    time2 = time.strftime('%H:%M:%S') if time changed, update it
    if time2 != time1:
        time1 = time2
        clock.config(text=time2)
        clock.after(1000, tik_tak) loop, function tik_tak run again and again, every 1 second
tik_tak()

window.mainloop()

Lesson