import Tkinter
 
F1 = Tkinter.Frame()
s = Tkinter.Scrollbar(F1)
L = Tkinter.Listbox(F1)
 
s.pack(side=Tkinter.RIGHT, fill=Tkinter.Y)
L.pack(side=Tkinter.LEFT, fill=Tkinter.Y)
 
s['command'] = L.yview
L['yscrollcommand'] = s.set
 
for i in range(30): 
   L.insert(Tkinter.END, str(i))
 
F1.pack(side=Tkinter.TOP)
 
F2 = Tkinter.Frame()
lab = Tkinter.Label(F2)
 
def poll():
    lab.after(200, poll)
    sel = L.curselection()
    lab.config(text=str(sel))
 
lab.pack()
F2.pack(side=Tkinter.TOP)
 
poll()
Tkinter.mainloop()

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