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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