title: TkInter, slider: how to trigger the event only when the iteraction is complete?
body: <p>I'm using the slider to update my visualization, but the command updateValue is sent everytime I move the slider thumb, even for intermediate values.</p>
  
  <p>Instead I want to trigger it only when I release the mouse button and the interaction is complete.</p>
  
  <pre><code>self.slider = tk.Scale(self.leftFrame, from_=0, to=256, orient=tk.HORIZONTAL, command=updateValue)
  </code></pre>
  
  <p>How can I trigger the function only once, when the interaction is ended ?</p>