title: How to order a list of lists by the first value
body: <p>I have a list of lists that looks like this</p>
  
  <pre><code>l1 = [[1,'steve'],[4,'jane'],[3,'frank'],[2,'kim']]
  </code></pre>
  
  <p>and I want to order them by the first number</p>
  
  <p>how would i go about this, thank you</p>