Create a stopwatch using python

Difficulty Level : Easy
Last Updated : 15 May, 2020

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.

# Python program to create a 
# a new window using Tkinter 
# importing the required libraires 
import tkinter 
  
# creating a object 'top' as instance of class Tk 
top = tkinter.Tk() 
  
# This will start the blank window 
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:

# Python program to illustrate a stop watch  
# using Tkinter  
#importing the required libraries  
import tkinter as Tkinter  
from datetime import datetime 
counter = 66600
running = False
def counter_label(label):  
    def count():  
        if running:  
            global counter  
    
            # To manage the intial delay.  
            if counter==66600:              
                display="Starting..."
            else: 
                tt = datetime.fromtimestamp(counter) 
                string = tt.strftime("%H:%M:%S") 
                display=string  
    
            label['text']=display   # Or label.config(text=display)  
    
            # label.after(arg1, arg2) delays by   
            # first argument given in milliseconds  
            # and then calls the function given as second argument.  
            # Generally like here we need to call the   
            # function in which it is present repeatedly.  
            # Delays by 1000ms=1 seconds and call count again.  
            label.after(1000, count)   
            counter += 1
    
    # Triggering the start of the counter.  
    count()       
    
# start function of the stopwatch  
def Start(label):  
    global running  
    running=True
    counter_label(label)  
    start['state']='disabled'
    stop['state']='normal'
    reset['state']='normal'
    
# Stop function of the stopwatch  
def Stop():  
    global running  
    start['state']='normal'
    stop['state']='disabled'
    reset['state']='normal'
    running = False
    
# Reset function of the stopwatch  
def Reset(label):  
    global counter  
    counter=66600
    
    # If rest is pressed after pressing stop.  
    if running==False:        
        reset['state']='disabled'
        label['text']='Welcome!'
    
    # If reset is pressed while the stopwatch is running.  
    else:                 
        label['text']='Starting...'
    
root = Tkinter.Tk()  
root.title("Stopwatch")  
    
# Fixing the window size.  
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:

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