Why do I receive an ImportError when running one of the CherryPy tutorials

$ cd /Library/Python/2.5/site-packages/cherrypy/tutorial/
$ python tut09_files.py
Traceback (most recent call last):
  File "tut09_files.py", line 48, in <module>
    from cherrypy.lib import static
ImportError: cannot import name static

import cherrypy