Create a stopwatch using python

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 stopclock. 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.

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# Python program to illustrate a stop watch 
# using Tkinter 
#importing the required libraries 
import tkinter as Tkinter 
  
counter = -1
running = False
def counter_label(label): 
    def count(): 
        if running: 
            global counter 
  
            # To manage the intial delay. 
            if counter==-1:             
                display="Starting..."
            else: 
                display=str(counter) 
  
            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=-1
  
    # 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() 
start = Tkinter.Button(root, text='Start',  
width=15, command=lambda:Start(label)) 
stop = Tkinter.Button(root, text='Stop',  
width=15, state='disabled', command=Stop) 
reset = Tkinter.Button(root, text='Reset', 
 width=15, state='disabled', command=lambda:Reset(label)) 
start.pack() 
stop.pack() 
reset.pack() 
root.mainloop() 