 <p>I made some example with event but we still don't know what is the problem in your code.</p> <pre><code>import Tkinter as tk def test(event): print 'event:', event print 'type:', event.type # 4 master = tk.Tk() b1 = tk.Button(master, text="QUIT", command=master.destroy, width=20, heigh=5) b1.pack() b2 = tk.Button(master, text="OK", width=20, heigh=5) b2.pack() b2.bind('&lt;Double-Button-1&gt;', test) master.mainloop() </code></pre> <p>.</p> <pre><code>event: &lt;Tkinter.Event instance at 0x1c79128&gt; type: 4 </code></pre>