title: how to refresh the window in python
body: <p>I have a function which will display features of an image. Once it got displayed, I want to refresh it for the next image. 
  For instance if I have a window like this 
  <img src="https://i.stack.imgur.com/C8JmI.png" alt=""></p>
  
  <p>Once I click on the <strong>Refresh Button</strong> the window should be like this
  <img src="https://i.stack.imgur.com/BxYDi.png" alt="enter image description here"></p>
  
  <p>Initially every feature values are set to zero.
  How to achieve this? I have tried with <code>grid_forget()</code> it will not give me what I wanted. I don't want to clear the window, I just want to clear the entries in each of the Entry box, and I want to clear the Label too, so that I can select another image</p>
  
  <p>Thanks in advance!</p>