Simple Timer

timer.py

from tkinter import *
import tkinter.font as font
import threading

window=Tk()
window.title("Remind Chris to get up.")
helv36 = font.Font(family='Helvetica', size=36, weight=font.BOLD)

def beep():
    for i in range(1,5):
        print("\a")

def start_timer():
    button.config(bg="yellow")
    t = threading.Timer(1800.0, stop_timer)
    t.start()

def stop_timer():
    button.config(bg="red")
    beep()    

button=Button(window,text="Start",height=5, width=10,font=helv36,command=start_timer, bg="green")
button.grid(row=0,column=0)


window.mainloop()