The library presents a Graph interface which can be backed by any one of a number of store implementations including: memory and Sleepycat/BerkeleyDB. With extension projects, stores based on MySQL, SQLite, remote SPARQL Endpoints, etc. are also possible.
General documentation and API docs are on ReadTheDocs They are up-to-date wrt. to the latest state of the source repositories. Have a look at the examples: and also see the RDFLib homepage for more information on installing and learning RDFLib.
Many related projects exist that provide inference engines or additional store support for RDFLib.
See the Developer Guide, a guide for RDFLib developers to follow.
There is a #rdflib irc channel on irc.freenode.net for anyone who wants to chat about RDFLib. See freenode for more information.
There is also a Google group that is used as a mailing list