Not proceeding with code after while loop

April 25, 2022

I’m trying to make a simple digital clock using Tkinter. However, after I use "while True" to update the variable and the label, it doesn’t create a window, even though that part is not indented. Here’s my code:

from datetime import datetime
from tkinter import *

root = Tk()
root.geometry('400x200')

while True
    now = datetime.now()

    current_time = now.strftime("%H:%M:%S")

    clock = Label(root, text = current_time)
    clock.pack()


root.update()
``

>Solution :

while True:
...

Program is stucked in this part it will keep on executing it.

In order to solve the issue move while True logic inside a thread.
Here’s another simple approach we are using clock.after(400, update) which will call after 400 milliseconds and update the label we are using mainloop to ensure that main will not exit till our window is not closed.

from datetime import datetime
from tkinter import *

root = Tk()
root.geometry('400x200')

clock = Label(root)
clock.pack()

def update():
    now = datetime.now()
    current_time = now.strftime("%H:%M:%S")
    print(current_time)
    clock.config(text=current_time)
    clock.after(400, update)



root.update()

update()

mainloop()