roman.py contains the following text:
This program is part of "Dive Into Python", a free Python tutorial for
experienced programmers. Visit http://diveintopython.org/ for the
However, http://diveintopython.org/ currently reads:
The requested resource / is no longer available on this server and there is no forwarding address. Please remove all references to this resource.
You might want to remove the URL, or maybe point the mirror that apparently someone provides: