This is on: Python 2.5 (r25:51908, Oct 19 2007, 09:46:41) [GCC 4.1.2 20070925 (Red Hat 4.1.2-27)] on linux2 Redhat Fedora release 7 (Moonshine) x86 64 bit processor (SMP) > The program worked fine for me (python 2.5.1 - stackless on > Mac OSX). Can you provide details about your platform (python > version, OS, etc.) ?