title: Use of exec and eval in Python
body: <p>So I have understood what <code>exec</code> and <code>eval</code> and also <code>compile</code> do. But why would I need to use them? I am being unclear on the usage scenario. </p>
  
  <p>Can anyone give me some examples so that I can better appreciate the concept. Cause right I know it is all theory.</p>