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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def search_biosamples(self, dataset_id, name=None, individual_id=None):
 """ Returns an iterator over the Biosamples fulfilling the specified conditions. :param str dataset_id: The dataset to search within. :param str name: Only Biosamples matching the specified name will be returned. :param str individual_id: Only Biosamples matching matching this id will be returned. :return: An iterator over the :class:`ga4gh.protocol.Biosample` objects defined by the query parameters. """

        request = protocol.SearchBiosamplesRequest()
        request.dataset_id = dataset_id
        request.name = pb.string(name)
        request.individual_id = pb.string(individual_id)
        request.page_size = pb.int(self._page_size)
        return self._run_search_request(
            request, "biosamples", protocol.SearchBiosamplesResponse)