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python tkinter listbox detect selection change

def onselect(evt):
    # Note here that Tkinter passes an event object to onselect()
    w = evt.widget
    index = int(w.curselection()[0])
    value = w.get(index)
    print('You selected item %d: "%s"' % (index, value))

lb = Listbox(frame, name='lb')
lb.bind('<<ListboxSelect>>', onselect)
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