The App Engine NDB Client Library overview | App Engine standard environment | Google Cloud Documentation

The Google Datastore NDB Client Library allows App Engine Python apps to connect to Datastore. The NDB client library builds on the older DB Datastore library adding the following data store features: The StructuredProperty class, which allows entities to have nested structure. Integrated automatic caching, which typically gives fast and inexpensive reads via an in-context cache and Memcache. Supp

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...provides a query engine and transactional storing with a simple API, all running on Google's scalable infrastructure. The Python interface includes a data modelling API and a SQL-like query language called GQL, making developing scalable data-backed apps as easy as with simple web hosting.