title: how to show a loading message in tkinter
body: <p>I am new to tkinter. I made the required dialog box. One of my function takes some time to process. So i want to show a "loading ... " message before that function starts executing.</p>
  
  <pre><code>b1 = Button(text = "Compare",command = compare)
  b1.pack()
  </code></pre>
  
  <p>when this button is clicked compare() function start executing. i want to show a loading message before that function starts. I tried using a label , such that i set a value to it on the starting of the compare() function. but it will only takes effect after the function finish executing. </p>
  
  <p>How can i do it? please help me..</p>