title: Get all elements at index in 2d array
body: <p>I am writing an ML algorithm where I have a list of tuples like so:  </p>
  
  <pre><code>[ [17582.0, 6.382129, 0.876581], [9868.0, 2.694977, 0.432818], [18333.0, 3.951256, 0.3333] ...]  
  </code></pre>
  
  <p>So, all index=0 refer to a specific value for a feature. To normalize, I need to get the min and max of every feature.   </p>
  
  <p>Is there a short hand way to get all elements at index = 0 or index = 1, and so on of the tuples?</p>