Processing owl\rdf in python

Hi,
Can someone out here suggest the best python package for manipulating
existing owl\rdf ontologies, my typical use case would be frequent addition
of individuals and augmentation of ontology. My ontologies are constructed
in protege but other systems including some python packages have a hard
time recognizing them.
Thanks

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Aliabbas Petiwala| Phd Scholar|Interdisciplinary Program in Education
Technology**|IIT *
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*Bombay|+919664867707 | http://home.iitb.ac.in/~aliabbas/*