title: How to 'clear' the port when restarting django runserver
body: <p>Often, when restarting Django runserver, if I use the same port number, I get a 'port is already in use' message.  Subsequently, I need to increment the port number each time to avoid this.</p>
  
  <p>It's not the case on all servers, however, so I'm wondering how I might achieve this on the current system that I'm working on? </p>
  
  <p>BTW, the platform is Ubuntu 8.10</p>