title: How to call two methods in same class?
body: <p>How can I call two methods from the same class over one object? I mean I try to write a class and it's methods to run above code:</p>
  
  <pre><code>volume = Calculate.do_calc().get_volume(a);
  </code></pre>
  
  <p>I am creating Calculate class and two methods of it. do_calc() and get_volume(a). How should I write this class to run that code.</p>