Today I was in need of some basic encryption for my django app, and scoured the internet for answers. To my great surprise, this wasn't even listed as a recipe in the Python Cookbook from O'Reilly, but it was easy to find a good tool online, which I did in pycrypto.
However, I had problems building the project on Feisty Fawn using 'python setup.py install', but apt-get came through graciously
# apt-get install python-crypto