title: how to access media_root in py file
body: <p>settings.py</p>
  
  <pre><code>MEDIA_URL = '/media/'
  MEDIA_ROOT = '/Users/blah/djangoproj/abc/abc/media/static/'
  </code></pre>
  
  <p>In random.py file,
  how do I access files within MEDIA_ROOT? How should I add media_root to urls.py?</p>