To make this work with Openshift run:
$ APP_NAME=yourapp
$ rhc env set OPENSHIFT_PYTHON_WSGI_APPLICATION=django_exp/wsgi.py -a $APP_NAME
# You may need to restart your app
$ rhc app-restart -a $APP_NAME
Also, create the database:
$ rhc ssh -a $APP_NAME
$ cd app-root/runtime/repo
$ python manage.py migrate