title: How to add with tuples
body: <p>I have pseudo-code like this:</p>
  
  <pre><code>if( b &lt; a)
     return (1,0)+foo(a-b,b)
  </code></pre>
  
  <p>I want to write it in python. But can python add tuples? What is the best way to code something like that?</p>