Good point. The two machines that the code works with are running python 2.6.1 and 2.7.2 and are running on my Mac (Snow Leopard)
The two non-working machines are running python 2.6.6 and 2.7.1 and are on Debian 6 and Debian 5 respectively. They are VPSs managed by different providers. All of the installs are on separate virtuaenvs. -- http://mail.python.org/mailman/listinfo/python-list
