Точное время GUI

time.py

from tkinter import *
from time import strftime

root = Tk()
root.title("Time")
root.geometry('200x120')
root.resizable(width=False, height=False)

time_var = StringVar()
date_var = StringVar()

def set_time():
    time_var.set(strftime('%H:%M:%S'))
    date_var.set(strftime('%a - %x'))
    root.after(1000, set_time)

Label(root, bd=11, textvariable=time_var, font = 'Arial 16').pack()
Label(root, bd=11, textvariable=date_var, font = 'Arial 14').pack()
set_time()
root.mainloop()