Returns an iterator over the Phenotypes from the server

def search_phenotype(
            self, phenotype_association_set_id=None, phenotype_id=None,
            description=None, type_=None, age_of_onset=None):
        """
        Returns an iterator over the Phenotypes from the server
        """
        request = protocol.SearchPhenotypesRequest()
        request.phenotype_association_set_id = phenotype_association_set_id
        if phenotype_id:
            request.id = phenotype_id
        if description:
            request.description = description
        if type_:
            request.type.mergeFrom(type_)
        if age_of_onset:
            request.age_of_onset = age_of_onset
        request.page_size = pb.int(self._page_size)
        return self._run_search_request(
            request, "phenotypes",
            protocol.SearchPhenotypesResponse)