Behavior-Driven Development (BDD) Tools for Python

Behave
http://pythonhosted.org/behave/

Behave - Changing Step Definition Parsing
http://jenisys.github.io/behave.example/step_matcher/re_matcher.html

Behave Examples and Tutorials (Excellent!!!)
http://jenisys.github.io/behave.example/

Behave - Feature Testing Setup
http://behave.readthedocs.org/en/latest/gherkin.html

Behave - GitHub Link
https://github.com/behave/behave

Lettuce versus Behave
http://fortylines.com/blog/LettuceVsBehave.blog

Lettuce
http://lettuce.it/