title: Is there an easy way to tell which URLs are unused?
body: <p>I have a Django project which is entering its fourth year of development. Over those four years, a number of URLs (and therefore view functions) have become obsolete. Instead of deleting them as I go, I've left them in a "just in case" attitude. Now I'm looking to clean out the unused URLs and unused view functions. </p>
  
  <p>Is there any easy way to do this, or is it just a matter of grunting through all the code to figure it out? I'm nervous about deleting something and not realizing it's important until a few weeks/months later. </p>