Create a stopwatch using python

import tkinter as Tkinter

from datetime import datetime

counter = 66600

running = False

def counter_label(label):

def count():

if running:

global counter

if counter==66600:

display="Starting..."

else:

tt = datetime.fromtimestamp(counter)

string = tt.strftime("%H:%M:%S")

display=string

label['text']=display 

label.after(1000, count)

counter += 1

count()

def Start(label):

global running

running=True

counter_label(label)

start['state']='disabled'

stop['state']='normal'

reset['state']='normal'

def Stop():

global running

start['state']='normal'

stop['state']='disabled'

reset['state']='normal'

running = False

def Reset(label):

global counter

counter=66600

if running==False:

reset['state']='disabled'

label['text']='Welcome!'

else:

label['text']='Starting...'

root = Tkinter.Tk()

root.title("Stopwatch")

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()