运行效果：

完整源码：

##import library

from tkinter import *

import time

from playsound import playsound

## display window

root = tk()

root.geometry('400x300')

root.resizable(0,0)

root.config(bg ='blanched almond')

root.title('techvidvan - countdown clock and timer')

label(root, text = 'countdown clock and timer' , font = 'arial 20 bold', bg ='papaya whip').pack()

#display current time#######################

label(root, font ='arial 15 bold', text = 'current time :', bg = 'papaya whip').place(x = 40 ,y = 70)

####fun to display current time

def clock():

clock_time = time.strftime('%h:%m:%s %p')

curr_time.config(text = clock_time)

curr_time.after(1000,clock)

curr_time =label(root, font ='arial 15 bold', text = '', fg = 'gray25' ,bg ='papaya whip')

curr_time.place(x = 190 , y = 70)

clock()

#######################timer countdown##########

#storing seconds

sec = stringvar()

entry(root, textvariable = sec, width = 2, font = 'arial 12').place(x=250, y=155)

sec.set('00')

#storing minutes

mins= stringvar()

entry(root, textvariable = mins, width =2, font = 'arial 12').place(x=225, y=155)

mins.set('00')

# storing hours

hrs= stringvar()

entry(root, textvariable = hrs, width =2, font = 'arial 12').place(x=200, y=155)

hrs.set('00')

##########fun to start countdown

def countdown():

times = int(hrs.get())*3600+ int(mins.get())*60 + int(sec.get())

while times > -1:

minute,second = (times // 60 , times % 60)

hour = 0

if minute > 60:

hour , minute = (minute // 60 , minute % 60)

sec.set(second)

mins.set(minute)

hrs.set(hour)

root.update()

time.sleep(1)

if(times == 0):

playsound('loud_alarm_clock_buzzer.mp3')

sec.set('00')

mins.set('00')

hrs.set('00')

times -= 1

label(root, font ='arial 15 bold', text = 'set the time', bg ='papaya whip').place(x = 40 ,y = 150)

button(root, text='start', bd ='5', command = countdown, bg = 'antique white', font = 'arial 10 bold').place(x=150, y=210)

root.mainloop()

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