title: Why does python + pylons "remember" previously specified class variables?
body: <p>I have a simple form in python + pylons that submits to a controller.  However, each page load doesn't seem to be a fresh instantiation of the class.  Rather, class variables specified on the previous page load are still accessible.  </p>
  
  <p>What's going on here?  And what's the solution?</p>