title: Pandas Dataframe - find max between two columns
body: <p>I have a csv that looks like this:</p>
  
  <pre><code>Students | Math | Reading
  Tom | 80 | 75
  Mike | 65 | 90
  </code></pre>
  
  <p>I want to import this csv and determine which <code>Student</code> has the largest difference between their <code>Math</code> and <code>Reading</code> scores.</p>
  
  <p>In this example.  I expect <code>Mike</code> to be the result as his difference is <code>25</code> while Tom's difference is <code>15</code>.</p>