This is a project creates a custom Python codec that lets you write your tests using an RSpec inspired DSL (i.e. describe and it blocks).

It uses the fact that you can register a codec that is able to modify a Python file before executing it. Using this when Python imports a file with a particular encoding as the first line of the file it will be intercepted and potentially rewritten into something else before the import continues.

nose-of-yeti uses this technique to translate from the DSL it defines, into Python classes and functions that then will be executed by your test framework of choice.