GUI를 정지하지 않고 Tkinter에서 원활하게 업데이트되는 시계를 어떻게 만들 수 있습니까?

import Tkinter as tk
import time

class App():
    def __init__(self):
        # Initialize the Tkinter window
        self.root = tk.Tk()

        # Create the Label widget to display the time
        self.label = tk.Label(text="")
        self.label.pack()

        # Schedule the initial clock update
        self.update_clock()

        # Run the Tkinter event loop
        self.root.mainloop()

    def update_clock(self):
        # Get the current time formatted as "hh:mm:ss"
        now = time.strftime("%H:%M:%S")

        # Update the Label widget with the current time
        self.label.configure(text=now)

        # Schedule the next clock update
        self.root.after(1000, self.update_clock)

app = App()