How can I quickly change the text of a Label (Tkinter) (Datetime)?

Question

Python

I make electronic watches. I made the Label variable and in text = (date_time.hour, minute, second)
so that they are always updated wrote:
while True:
TimeHour = Label(root, text=date_time.hour, width=5, height=2,font=(' Verdana', 16, 'bold'))
TimeMinute = Label(root, text=date_time.minute, width=5, height=2,font=('Verdana', 16, 'bold')
TimeSecond = Label(root, width =5, text=date_time.second, height=2,font=('Verdana', 16, 'bold')
Why doesn't it work, can you tell me how to make this infinite timer?

Answer 1

Everything is terribly simple:

from tkinter import *
from tkinter.ttk import *
from datetime import *
root = Tk()
timeVar = StringVar()#Это переменная для надписи
Label(root,textvar=timeVar, font=('Verdana', 16, 'bold')).pack()
def update():
    timeVar.set(datetime.now().strftime("%H:%M:%S"))
    root.after(1000, update)#тут добавляем вызов через 1000мс  из mainloop
update()#вызываем первый раз
root.mainloop()#это аналог while True