pset8 mashup troubles

Question

So I am having trouble understanding how json works my Json is not outputting any of of the articles through the infowindow does anyone here know what problems I am causing?
Ill first show my code in my add marker function

function addMarker(place)
{
    // TODO get long and lat into one variable and put it in marker keys
    var myLatlng = new google.maps.LatLng(place.latitude, place.longitude);
    marker = new google.maps.Marker({
            position: myLatlng,
            map: map
        });

  // adding a anonymous function to trigger on click
    marker.addListener('click', function() {
    info.open(marker.get('map'), marker);
    $.getJSON("application.py", {
        geo: place.postal_code
        });
  });  

Also here is my article search in my python backend

@app.route("/articles")
def articles():
    """Look up articles for geo."""

    # TODO look up geo articles information and jsonify it to browser
    r =lookup(request.args.get("geo"))
    if not request.args.get("geo"):           
        raise RuntimeError("missing geo")
    return jsonify([r])