title: Subtract elements in first list from the second list
body: <p>Let's say I have two lists: <code>full_links</code>  &amp; <code>href_links</code></p>
  
  <p>I want to remove values in <code>href_links</code> which contain duplicate values from <code>full_links</code></p>
  
  <p>For example:</p>
  
  <pre><code>full_links = [ 1,2,3,4,5]
  href_links = [ 1,2,7,8,9,3]
  </code></pre>
  
  <p>So, the output should be:</p>
  
  <pre><code>comb_list = [7,8,9]
  </code></pre>
  
  <p>My code is:</p>
  
  <pre><code>comb_list = list(set(full_links) - set(href_links))
  </code></pre>
  
  <p>But it is not working. </p>