shows a timer counting down in a window using tinker

timeout.py

#!/usr/bin/python
import Tkinter as tk
import time

class App():
    def __init__(self):
        self.timer = 60
        self.root = tk.Tk()
        self.label = tk.Label(text="")
        self.label.pack()
        self.root.geometry('{}x{}'.format(200, 200))
        self.update_clock()
        self.root.mainloop()

    def update_clock(self):
        self.timer = self.timer - 1
        self.label.configure(text=self.timer)
        self.root.after(1000, self.update_clock)

app=App()