title: How to get string after last comma in a field
body: <p>I have a column with data like this that I'm accessing via Python:</p>
  
  <pre><code>501,555,570=3.5
  </code></pre>
  
  <p>I want to get <code>570=3.5</code>.</p>
  
  <p>How can I do that? Would it be a variation of the split command?</p>