python lines that start with @
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/739654/understanding-python-decorators">Understanding Python decorators</a>  </p>
</blockquote>



<p>I was reading a django app source code where I find this</p>

<pre><code>@login_required
def activities(request = None,\
            project_id = 0,\
            task_id = 0,\
            ...
</code></pre>

<p>What does the line that start with @ mean?</p>
