This document discusses using Google App Engine and its Python SDK for quickly prototyping web applications. Some key points covered include: - App Engine allows developers to build and host web apps and supports Python runtimes. It offers scalable hosting and APIs for common tasks like user auth and data storage. - The Python SDK makes it easy to quickly create prototypes by providing a local development server, a scalable datastore, and APIs that handle common tasks so developers can focus on unique features. - Examples of prototyping tasks demonstrated include adding entities to the datastore, building basic views and filters, and testing the prototype. Frameworks like webapp2 and appengine-rest-server can further accelerate the prototyping process