Sickle is an OAI-PMH client library written in Python:
>>> sickle = Sickle('http://elis.da.ulcc.ac.uk/cgi/oai2')
>>> records = sickle.ListRecords(metadataPrefix='oai_dc')
Most importantly, Sickle lets you conveniently iterate through resumption batches
without having to deal with resumptionTokens yourself:
>>> records.next() <Record ...>