Build Stop watch in Python

In this python tutorial, you will learn how you can build a stopwatch in python. The best way to learn python is to build something with it.

The code provided is a well-documented code and is very easy to understand. Go through the code and you will see how to create a stopwatch in python.

Python code To Build Stop Watch

The best way to unserstand how to build a stop watch in python is to learn what we have used in it. we have used the tkinter module and the datetime module.

Requirements

You should know

• basics of Tkinter module in python
• basics of datetime module in python

We have used Tkinter for creating a graphical user interface in python, but you can use any of the graphical user interface library in python to build this project.

Recommended Articles:

Python Libraries for DateTime

DateTime package in Python

Python Source code for Building stopwatch:

import tkinter as Tkinter
from datetime import datetime
counter = 0
running = False


def counter_label(label):
    def count():
        if running:
            global counter
			# To manage the intial delay. 
            if counter == 0:
                display = 'Ready!'
            else:
                tt = datetime.utcfromtimestamp(counter)
                string = tt.strftime('%H:%M:%S')
                display = string
	
            label['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 = 0
	# If reset is pressed after pressing stop. 
	if not running:
		reset['state'] = 'disabled'
		label['text'] = '00:00:00'
	# If reset is pressed while the stopwatch is running. 
	else:
		label['text'] = '00:00:00'


root = Tkinter.Tk()
root.title("Stopwatch")

# Fixing the window size.
root.minsize(width=250, height=70)
label = Tkinter.Label(root, text='Ready!', 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()

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Summary and Conclusion

In this article, you have learned how to build a stopwatch application for desktop in python. if you have any questions, please leave them in the comment section.