Stop-watch using Python with source code | Python Mini project|

Stop-watch

Python offers multiple options for developing GUI (Graphical User Interface). Out of all the GUI methods, tkinter is most commonly used method. It is a standard Python interface to the Tk GUI toolkit shipped with Python. In this code there are three labels set as starting (start the counting from 0),stop (stop the counting)and reset (clear all the values).

 Here the code is:
#Step1:importing the required libraries 
import tkinter as Tkinter 

#Step2:set the counter as -1 to start counting from 0 and running false
counter = -1
running = False
#Step3:Function to start the counting
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) 

# Step4: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

#Step4: Triggering the start of the counter. 
count()  

#Step5: start function of the stopwatch 
def Start(label): 
global running 
running=True
counter_label(label) 
start['state']='disabled'
stop['state']='normal'
reset['state']='normal'

#Step6: Stop function of the stopwatch 
def Stop(): 
global running 
start['state']='normal'
stop['state']='disabled'
reset['state']='normal'
running = False

#Step7: 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...'

#Step8: creating root object 
root = Tkinter.Tk() 
root.title("Stopwatch")
root.configure(bg="black")

# Step9:Fixing the window size. 
root.minsize(width=250, height=100) 

#Step10:Setting the label
label = Tkinter.Label(root, text="Welcome!",bg="black" ,fg="white", 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()

#Step11 keeps window alive  
root.mainloop() 

Look at the output of this code:

You can also learn:
Calculator in Python