title: Convert CSV column to list
body: <p>Say I have a CSV file. 
  It contains:</p>
  
  <pre><code>a,b,c
  1,2,3
  4,5,6
  7,8,9
  </code></pre>
  
  <p>How can I turn the column labeled 'a' into a list, without hard-coding a row to it?</p>
  
  <p>Originally, I was doing a readline for the first line <code>a,b,c</code> and then hard-coding a row to each variable. But then I thought: what if I wanted to do it with the possibility of the CSV file not being arranged the same way - say:</p>
  
  <pre><code>b,a,c
  2,1,3
  5,4,6
  8,7,9
  </code></pre>
  
  <p>What's the best way to go about this?</p>