Countdown Timer

import time

from tkinter import *

from tkinter import messagebox

root = Tk()

root.geometry("300x250")

root.title("Time Counter")

hour=StringVar()

minute=StringVar()

second=StringVar()

hour.set("00")

minute.set("00")

second.set("00")

hourEntry= Entry(root, width=3, font=("Arial",18,""),

textvariable=hour)

hourEntry.place(x=80,y=20)

minuteEntry= Entry(root, width=3, font=("Arial",18,""),

textvariable=minute)

minuteEntry.place(x=130,y=20)

secondEntry= Entry(root, width=3, font=("Arial",18,""),

textvariable=second)

secondEntry.place(x=180,y=20)

def submit():

try:

temp = int(hour.get())*3600 + int(minute.get())*60 + int(second.get())

except:

print("Please input the right value")

while temp >-1:

mins,secs = divmod(temp,60)

hours=0

if mins >60:

hours, mins = divmod(mins, 60)

hour.set("{0:2d}".format(hours))

minute.set("{0:2d}".format(mins))

second.set("{0:2d}".format(secs))

root.update()

time.sleep(1)

if (temp == 0):

messagebox.showinfo("Time Countdown", "Time's up ")

temp -= 1

btn = Button(root, text='Set Time Countdown', bd='5',

command= submit)

btn.place(x = 70,y = 120)

root.mainloop()