code: def post(method, hmc, uri, uri_parms, body, logon_required,
               wait_for_completion):
          
          assert wait_for_completion is True  # this operation is always synchr.
          cpc_oid = uri_parms[0]
          try:
              cpc = hmc.cpcs.lookup_by_oid(cpc_oid)
          except KeyError:
              raise InvalidResourceError(method, uri)
          if not cpc.dpm_enabled:
              raise CpcNotInDpmError(method, uri, cpc)
          check_required_fields(method, uri, body, ['partitions'])
          partition_uris = body['partitions']
          if len(partition_uris) == 0:
              raise BadRequestError(
                  method, uri, reason=149,
                  message="'partitions' field in request body is empty.")
  
          wwpn_list = []
          for partition_uri in partition_uris:
              partition = hmc.lookup_by_uri(partition_uri)
              partition_cpc = partition.manager.parent
              if partition_cpc.oid != cpc_oid:
                  raise BadRequestError(
                      method, uri, reason=149,
                      message="Partition %r specified in 'partitions' field "
                      "is not in the targeted CPC with ID %r (but in the CPC "
                      "with ID %r)." %
                      (partition.uri, cpc_oid, partition_cpc.oid))
              partition_name = partition.properties.get('name', '')
              for hba in partition.hbas.list():
                  port_uri = hba.properties['adapter-port-uri']
                  port = hmc.lookup_by_uri(port_uri)
                  adapter = port.manager.parent
                  adapter_id = adapter.properties.get('adapter-id', '')
                  devno = hba.properties.get('device-number', '')
                  wwpn = hba.properties.get('wwpn', '')
                  wwpn_str = '%s,%s,%s,%s' % (partition_name, adapter_id,
                                              devno, wwpn)
                  wwpn_list.append(wwpn_str)
          return {
              'wwpn-list': wwpn_list
          }
docs: Operation: Export WWPN List (requires DPM mode).