title: How to make zip_longest available in itertools using Python 2.7
body: <p>When trying to import this function on a Python Jupyter 2.7 nb running on Windows 10, I get this error:</p>
  
  <p><a href="https://i.stack.imgur.com/5CNLm.png" rel="noreferrer"><img src="https://i.stack.imgur.com/5CNLm.png" alt="enter image description here"></a></p>
  
  <p>I believe I hadn't encountered problems in the past because I was using Python 3. So I wonder if it is just that it is not available in Python 2, or if there is a way of making it work.</p>