[Python] How do I update text in toga?

I am trying to create a simple clock app, for that I am using time. I want to update the time label

Imports

import toga
from toga.style import Pack
from toga.style.pack import COLUMN, ROW
import time


code

self.time_label=toga.Label("00:00:00",style=Pack(padding=10,font_size=50))


I directly call the update_time() function in the startup method

self.Update_time()


self.time_label is needed to change to the current time the text will change inside the Update_time() function

def Update_time(self):
current_time= time.strftime('%I:%M:%S')
self.time_label.text=current_time


now I encounter that it only displays the time and does not change to the current time

eg: if i run the program at 9:22:56 it displays 9:22:56 but when it becomes 9:22:57 (or) 9:23:00 it still show 9:22:56

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