leandron/tannat — pull request #1 by perone (2011-11-10 12:54:44+00:00)
Title: Changed old-style classes to new-style classes;

Moved the class attributes to object attributes;
Changed old-style classes to new-style classes [1];
Used "not in" operator.

[1] http://docs.python.org/reference/datamodel.html#new-style-and-classic-classes