title: Access values from defaultdict object
body: <p>I have a defaultdict that has multiple values per key. I want to calculate the average value for each key. I can't figure out how to access the values associated with each key. Can anyone help?</p>
  
  <pre><code>[('T.Max', [1.62, 1.65, 1.62], ('T.Spon', [0.30, 0.34, 0.34])]
  </code></pre>