# Suivant que l'on exécute ce script sous Python 3 ou Python 2,
# on utilisera le module Tkinter correspondant :
try:
    from tkinter import *      # module Tkinter pour Python 3
except:
    from Tkinter import *      # module Tkinter pour Python 2
import time
 
class Chronometre(Frame):  
    """ insertion du chrnomètre dans un widget frame. """                                                                
    def __init__(self, parent=None, **kw):        
        Frame.__init__(self, parent, kw)
        self._start = 0.0        
        self._elapsedtime = 0.0
        self._running = 0
        self.timestr = StringVar()               
        self.makeWidgets()      
 
    def makeWidgets(self):                         
        """ Make the time label. """
        l = Label(self, textvariable=self.timestr,font=("DS-Digital",100),
                  bg='black',fg='red')
        self._setTime(self._elapsedtime)
        l.pack(fill=X, expand=NO, pady=5, padx=5)                      
 
    def _update(self): 
        """ Update the label with elapsed time. """
        self._elapsedtime = time.time() - self._start
        self._setTime(self._elapsedtime)
        self._timer = self.after(50, self._update)
 
    def _setTime(self, elap):
        """ Set the time string to Minutes:Seconds:Hundreths """
        minutes = int(elap/60)
        seconds = int(elap - minutes*60.0)
        hseconds = int((elap - minutes*60.0 - seconds)*100)                
        self.timestr.set('%02d:%02d:%02d' % (minutes, seconds, hseconds))
 
    def Start(self):                                                     
        """ Marche du chrono si arrêt. """
        if not self._running:            
            self._start = time.time() - self._elapsedtime
            self._update()
            self._running = 1        
 
    def Stop(self):                                    
        """ Arrêt du chrono si en marche. """
        if self._running:
            self.after_cancel(self._timer)            
            self._elapsedtime = time.time() - self._start    
            self._setTime(self._elapsedtime)
            self._running = 0
 
    def Reset(self):                                  
        """ Raz du chrono. """
        self._start = time.time()         
        self._elapsedtime = 0.0    
        self._setTime(self._elapsedtime)
 
    def get(self) :
        return self._running
 
 
def masw(Event,sw):
    if  sw.get() :
        sw.Stop()
        print ('stop')
    else:
        sw.Start()
        print ('start')
 
def main():
    root = Tk()
    sw = Chronometre(root)
    sw.pack(side=TOP)
 
    Button(root, text='Start', command=sw.Start).pack(side=LEFT)
    Button(root, text='Stop', command=sw.Stop).pack(side=LEFT)
    Button(root, text='Reset', command=sw.Reset).pack(side=LEFT)
    Button(root, text='Quit', command=root.quit).pack(side=LEFT)
 
    root.bind("<KeyPress-space>",lambda Event=Event, sw=sw :masw(Event,sw))
 
 
    root.mainloop()
 
if __name__ == '__main__':
    main()