openlibrary-client is a reference Python client library for the Open Library API, maintained by the Internet Archive. It provides object-oriented models for books, authors, editions, works, and covers, wrapping the REST endpoints behind a simple client class. The library supports cookie-based authentication, read/fetch operations, and write operations such as creating new works and editions. It also includes utilities for parsing MARC dump lines and validating book import schemas, making it useful beyond simple API access.