title: Is any magic method called on an object in a list during join()?
body: <p>Joining a list containing an object - is there any magic method I could set to convert the object to a string before join fails?</p>
  
  <pre><code>', '.join([…, Obj, …])
  </code></pre>
  
  <p>I tried <code>__str__</code> and <code>__repr__</code> but neither did work</p>