title: Django, change username
body: <p>Is it possible to change the username?</p>
  
  <p>I tried the following :-</p>
  
  <pre><code>user = User.objects.get(username = username)
  user.username = newusername
  user.save()
  </code></pre>
  
  <p>Nothing changes</p>
  
  <p>I can change the username in the admin screen, but there are more than 100 where the client asked for different usernames to be used.</p>