Create a stopwatch using python

A stopwatch is used to measure the time interval between two events usually in seconds to minutes. It has various usage like in sports or measuring the flow of heat, current etc in an industrial setup. Python can be used to creat a stopwatch by using its tkinter library.

This library will have the GUI features to create a stopwatch showing the Start, Stop and Reset option. The key component of the program is using the lable.after() module of tkinter.

label.after(parent, ms, function = None)
where
parent: The object of the widget which is using this function.
ms: Time in miliseconds.
function: Call back function

In the below program we use this method as out key component of the program and design a widget showing the GUI features in the stopwatch.

Example

import tkinter as tink
count = -1
run = False
def var_name(mark):
   def value():
      if run:
         global count
         # Just beore starting
         if count == -1:
            show = "Starting"
         else:
            show = str(count)
         mark['text'] = show
         #Increment the count after
         #every 1 second
         mark.after(1000, value)
         count += 1
   value()
# While Running
def Start(mark):
   global run
   run = True
   var_name(mark)
   start['state'] = 'disabled'
   stop['state'] = 'normal'
   reset['state'] = 'normal'
# While stopped
def Stop():
   global run
   start['state'] = 'normal'
   stop['state'] = 'disabled'
   reset['state'] = 'normal'
   run = False
# For Reset
def Reset(label):
   global count
   count = -1
   if run == False:
      reset['state'] = 'disabled'
      mark['text'] = 'Welcome'
   else:
      mark['text'] = 'Start'

base = tink.Tk()
base.title("PYTHON STOPWATCH")
base.minsize(width=300, height=200)
mark = tink.Label(base, text="Welcome", fg="blue", font="Times 25 bold",bg="white")
mark.pack()
start = tink.Button(base, text='Start',width=25, command=lambda: Start(mark))
stop = tink.Button(base, text='Stop', width=25, state='disabled', command=Stop)
reset = tink.Button(base, text='Reset',width=25, state='disabled', command=lambda: Reset(mark))
start.pack()
stop.pack()
reset.pack()
base.mainloop()

The below images show the three different scenarios when the stopwatch is run.

Starting the Stopwtach

Create a stopwatch using python

The running Stopwtach

Create a stopwatch using python

Stopping the Stopwtach

Create a stopwatch using python

Resetting the Stopwtach

Create a stopwatch using python