Using the GoogleCloudPlatform example

There is another sample app that you can check out.

It is a Python "Hello World" skeleton application for Google App Engine using Google Cloud Endpoints, available from Google Cloud GitHub repository - https://github.com/GoogleCloudPlatform/appengine-endpoints-helloendpoints-python.

This application shows how to use authentication and serves as a simple scaffolding for starting your own project. I will not go into details about this app, but I suggest you take a look at it.