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from Tkinter import*
from random import*
from time import*
from thread import*

class tag:
    def __init__(self,canvas,label):
        self.canvas=canvas
        self.label=label
        self.coord=randint(1,250)
        self.rechteck=self.canvas.create_rectangle(self.coord,self.coord,\
                                          self.coord+20,self.coord+20,fill='red')
        self.zeit1=time()
    def bind(self):
        self.canvas.tag_bind(self.rechteck,'<Button-1>',self.reg)
    def reg(self,e):
        self.zeit2=time()
        self.canvas.tag_bind(self.rechteck,'<Button-1>',self.nothing)
        self.zeit3=self.zeit2-self.zeit1
        self.label.config(text='Zeit: %.4f Sekunden'%self.zeit3)
    def nothing(self,e):
        pass
def run(canvas,label):
    sek=0
    liste=[1,0,0,0,0,1]
    while 1:
        label.config(text='Sekunden: %i'%sek)
        z=choice(liste)
        if z==1:
            instanz=tag(canvas,label)
            instanz.bind()
            break
        sleep(1.0)
        sek=sek+1
root=Tk()
root.title('Reaktionstest')

canvas=Canvas(root,width=250,height=250,bg='white')
canvas.pack()
label=Label(root,text='',relief=SUNKEN,bg='white',width=25)
label.pack(padx=5,pady=5)
ende=Button(root,text='ENDE',command=root.destroy)
ende.pack()

start_new_thread(run,(canvas,label))
root.mainloop()