Map-summing items in a multidimensional array
<p>I have an array that looks roughly like this:</p>

<pre><code>[ (0.5, 0.6, 0.7), (0.1, 0.9, 0.8), (0.9, 1.0, 0.4),
  ...
  (0.3, 0.8, 0.3), (0.2, 0.4, 0.9), (0.5, 0.5, 0.3) ]
</code></pre>

<p>What I need is a sum of [0][0], [0][1], [0][2], etc. as well as [1][0], [1][1], [1][2], etc. I need a way to get a sum of the first index of all items in the array, then a sum of the second index of all items in the array, etc. </p>

<p>How can I do this in Python? The ultimate result would be to have a single tuple that contained the average of each index of all of the tuples.</p>
