the seatbid and bid params from parse the Bid Response protobuf data are array or list (include ‘[]’)，but the support team feedback the normal data(parse the Bid Response protobuf data ) only include ’{}‘.why?

[schopenhauer zhang]

I use python 3.7 and proto 2.5(openrtb2.0),I set the message from the proto(https://developers.google.com/authorized-buyers/rtb/downloads/openrtb-proto)

in the proto file,you can see the seatbid and bid is repeated, both of them are array.but the support team said the seatbid and bid must is {} not [].

the manual address :https://developers.google.com/protocol-buffers/docs/pythontutorial

my python code :

bidResponse = openrtb_proto_pb2.BidResponse()
        bidResponse.id = bid_id
        bid_resp = bidResponse.seatbid.add()
        bid_resp_bid = bid_resp.bid.add()
    
        bid_resp_bid.id = 'xc' + ":1"
        bid_resp_bid.impid = imp_id
        bid_resp_bid.price = price
        bid_resp_bid.adid = "1"
        bid_resp_bid.adm = adm
        bid_resp_bid.adomain.extend(["example.com"])
        bid_resp_bid.iurl = iurl
        bid_resp_bid.cid = str(cid)
        bid_resp_bid.crid = crid
        bid_resp_bid.bundle = "00"
        bid_resp_bid.w = w
        bid_resp_bid.h = h
        bid_resp_bid.burl = nurl + '&crid=' + crid
  
        bidResponse.cur = "example"
        p1 = bidResponse.SerializeToString()

the p1 is result like this(include [] at seatbid and bid params):

id: "ECHO_BIDREQUEST_ID"
seatbid {[
  bid [{
    id: "BID_ID"
    impid: "1"
    price: 1.23
    adm: "AD_TAG"
    adomain: "DECLARED_LANDING_PAGE_URL"
    cid: "BILLING_ID"
    crid: "CREATIVE_ID"
    dealid: "DEAL_ID"
    w: 300
    h: 250
    [com.google.doubleclick.bid] {
      impression_tracking_url: "IMPRESSION_TRACKING_URL"
      exchange_deal_type: "DEAL_TYPE"
    }
  }]}]

but I want to get the result is like this(not include []at seatbid or bid params):

id: "ECHO_BIDREQUEST_ID"
seatbid {
  bid {
    id: "BID_ID"
    impid: "1"
    price: 1.23
    adm: "AD_TAG"
    adomain: "DECLARED_LANDING_PAGE_URL"
    cid: "BILLING_ID"
    crid: "CREATIVE_ID"
    dealid: "DEAL_ID"
    w: 300
    h: 250
    [com.google.doubleclick.bid] {
      impression_tracking_url: "IMPRESSION_TRACKING_URL"
      exchange_deal_type: "DEAL_TYPE"
    }
  }
}

how to change my code? Hope your feedback as soon as possible。