This module is a brute force implementation of the RDFS semantics on the top of RDFLib (with some caveats, see the documentation). It also implements the pD* semantics (also known as "ter Horst Semantics"), described in H.J.T. Horst, "Completeness, decidability and complexity of entailment for RDF Schema and a semantic extension involving the OWL vocabulary," Journal of Web Semantics, vol. 3, 2005, pp. 79-115.
See the online documentation for further details or download the compressed tar file for the Python file and the documentation.