title: python django 'str' object has no attribute 'delete'
body: <p>i have a object:</p>
  
  <pre><code>user = User.objects.get(id=3)
  user.first_name.delete()
  user.save()
  </code></pre>
  
  <p>I want to delete the first name of the user and keep it blank. When I do so it says <code>'str' object has no attribute 'delete'</code></p>
  
  <p>Whats wrong</p>