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This article focus on creating a stopwatch using Tkinter in python 
Tkinter : Tkinter is the standard GUI library for Python. Python when combined with Tkinter provides a fast and easy way to create GUI applications. Tkinter provides a powerful object-oriented interface to the Tk GUI toolkit. It’s very easy to get started with Tkinter, here are some sample codes to get your hands on Tkinter in python. 
 

Python3

import tkinter

top = tkinter.Tk()

top.mainloop()

Output: 
 

Creating Stopwatch using Tkinter

Now lets try to create a program using Tkinter module to create a stopwatch. 
A stopwatch is a handheld timepiece designed to measure the amount of time elapsed from a particular time when it is activated to the time when the piece is deactivated. A large digital version of a stopwatch designed for viewing at a distance, as in a sports stadium, is called a stop clock. In manual timing, the clock is started and stopped by a person pressing a button. In fully automatic time, both starting and stopping are triggered automatically, by sensors. 
Required Modules: We are only going to use Tkinter for creating GUI and no other libraries will be used in this program.
Source Code: 
 

Python3

import tkinter as Tkinter

from datetime import datetime

counter = 66600

running = False

def counter_label(label):

    def count():

        if running:

            global counter

            if counter==66600:            

                display="Starting..."

            else:

                tt = datetime.fromtimestamp(counter)

                string = tt.strftime("%H:%M:%S")

                display=string

            label['text']=display  

            label.after(1000, count) 

            counter += 1

    count()     

def Start(label):

    global running

    running=True

    counter_label(label)

    start['state']='disabled'

    stop['state']='normal'

    reset['state']='normal'

def Stop():

    global running

    start['state']='normal'

    stop['state']='disabled'

    reset['state']='normal'

    running = False

def Reset(label):

    global counter

    counter=66600

    if running==False:      

        reset['state']='disabled'

        label['text']='Welcome!'

    else:               

        label['text']='Starting...'

root = Tkinter.Tk()

root.title("Stopwatch")

root.minsize(width=250, height=70)

label = Tkinter.Label(root, text="Welcome!", fg="black", font="Verdana 30 bold")

label.pack()

f = Tkinter.Frame(root)

start = Tkinter.Button(f, text='Start', width=6, command=lambda:Start(label))

stop = Tkinter.Button(f, text='Stop',width=6,state='disabled', command=Stop)

reset = Tkinter.Button(f, text='Reset',width=6, state='disabled', command=lambda:Reset(label))

f.pack(anchor = 'center',pady=5)

start.pack(side="left")

stop.pack(side ="left")

reset.pack(side="left")

root.mainloop()

Output: 
 

https://media.geeksforgeeks.org/wp-content/uploads/2017-10-26-at-19-18-25.mp4

This article is contributed by Subhajit Saha. If you like GeeksforGeeks and would like to contribute, you can also write an article using write.geeksforgeeks.org or mail your article to . See your article appearing on the GeeksforGeeks main page and help other Geeks.
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