title: Why we need to check if value equals None?
body: <pre><code>values = [-50, -80, -100]
  max_value = None
  for i in values:
      if max_value is None or i &gt; max_value:
          max_value = i
  </code></pre>
  
  <p>why we need to include this code <code>max_value is None</code>
  Let's say we go through the for loop
  Loop 1: i = -50. We can't evaluate -50 with None, right?</p>