Use pyenv, virtualenv, or virtualenv wrapper to create a virtualenv using python 2.7.x.
For example:
pyenv virtualenv 2.7.11 rested_users
pyenv activate rested_users
git clone https://github.com/jessegonzalez/rested_users.git
cd rested_users
python setup.py test
python setup.py install
python rested_users/app.py
Now navigate to http://localhost:5000 for some Swagger!