Create Countdown Timer using Python-Tkinter

Prerequisistes: Python GUI – tkinter

Python Tkinter is a GUI programming package or built-in library. Tkinter provides the Tk GUI toolkit with a potent object-oriented interface. Python with Tkinter is the fastest and easiest way to create GUI applications. Creating a GUI using Tkinter is an easy task.

Approach

Importing the module – tkinter, time
Create the main window (container)
Add number of widgets to the main window:Button, Entry
Apply the event Trigger on the widgets.

Below is the implementation.

import time 
from tkinter import *
from tkinter import messagebox 
  
  
# creating Tk window 
root = Tk() 
   
# setting geometry of tk window 
root.geometry("300x250") 
   
# Using title() to display a message in 
# the dialogue box of the message in the 
# title bar. 
root.title("Time Counter") 
   
# Declaration of variables 
hour=StringVar() 
minute=StringVar() 
second=StringVar() 
   
# setting the default value as 0 
hour.set("00") 
minute.set("00") 
second.set("00") 
   
# Use of Entry class to take input from the user 
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: 
        # the input provided by the user is 
        # stored in here :temp 
        temp = int(hour.get())**3600 + int(minute.get())*60 + int(second.get()) 
    except: 
        print("Please input the right value") 
    while temp >-1: 
          
        # divmod(firstvalue = temp//60, secondvalue = temp%60) 
        mins,secs = divmod(temp,60)  
   
        # Converting the input entered in mins or secs to hours, 
        # mins ,secs(input = 110 min --> 120*60 = 6600 => 1hr : 
        # 50min: 0sec) 
        hours=0
        if mins >60: 
              
            # divmod(firstvalue = temp//60, secondvalue  
            # = temp%60) 
            hours, mins = divmod(mins, 60) 
          
        # using format () method to store the value up to  
        # two decimal places 
        hour.set("{0:2d}".format(hours)) 
        minute.set("{0:2d}".format(mins)) 
        second.set("{0:2d}".format(secs)) 
   
        # updating the GUI window after decrementing the 
        # temp value every time 
        root.update() 
        time.sleep(1) 
   
        # when temp value = 0; then a messagebox pop's up 
        # with a message:"Time's up" 
        if (temp == 0): 
            messagebox.showinfo("Time Countdown", "Time's up ") 
          
        # after every one sec the value of temp will be decremented 
        # by one 
        temp -= 1
  
# button widget 
btn = Button(root, text='Set Time Countdown', bd='5', 
             command= submit) 
btn.place(x = 70,y = 120) 
   
# infinite loop which is required to 
# run tkinter program infinitely 
# until an interrupt occurs 
root.mainloop() 

Output:

My Personal Notes

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