Django_localflavors is a project mainly written in Python, it's free.
A standalone third party localflavor libraries with fields supporting Django >= 1.1
This are libs with cpf/cnpj model fields, form fields, generators and 'types' in standalone way that runs on Django >= 1.1. Check cpfcnpj for a example project, you can run tests with ./manage.py test webui and use models and forms as example.