This project needs 'pipenv' :
pip install pipenv
pip install connexion
pip install connexion[swagger-ui]
Setup the environment and launch the server with the following (you can add -v and -d to connexion for more verbose output):
pipenv install
pipenv shell
connexion run --mock all openapi.yml
The API server is up and running, with mocked responses where implementation is not available. Browse to http://localhost:5000/api/ui to access SwaggerUI.