Create a stopwatch using python

• Difficulty Level : Easy.

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 libraries 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 initial 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: 
 

 

 

your stopwatch is completely ready.

Complete source code :

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 initial 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()