From the webpage:
Following the set of interfaces provided by tinkerpop for Blueprints, this proyect aims to give Python developers a similar functionality. A set of abstract classes are defined in order to guide the design of implementations for the different graph database engines.
If you are not already familiar with BluePrints, a common API for graph databases, you might want to start at TinkerPop. Or you can jump directly to BluePrints if you are checking a detail or what to help with the code.
From the Blueprints webpage:
Blueprints is a property graph model interface. It provides implementations, test suites, and supporting extensions. Graph databases and frameworks that implement the Blueprints interfaces automatically support Blueprints-enabled applications. Likewise, Blueprints-enabled applications can plug-and-play different Blueprints-enabled graph backends.