Mappy | Slapper compatible object mapper | Object-Relational Mapping library

I am trying to use the package mappy from python inside julia but I get this error: AttributeError("'PyCall.jlwrap' object has no attribute 'encode'"). I don't understand this error.

here is my code:

I have created a custom KmlLayer class to which I had to add in a value of the custom map class to the map property similar to this guide here:

https://developers.google.com/maps/documentation/javascript/examples/layer-kml

Like so:

I have a JS Map that looks like this let mappy = new Map() I would like to add items to the array using the key and I could do this:

Please consider this C++ code:

I am trying to create 'previous' and 'next' buttons that cycle through different locations on an embedded Google Maps image, but have the 'previous' button hidden at the first location, and have the 'next' button disappear once the last location shows.

I know adding a CSS class called 'hidden' would do the trick, however I'm not sure where to place it, and how to place it.

Here is my HTML code. The iframe element is the google maps, and I gave it an id of 'mappy', to select it easier in JavaScript. Below the map are the two buttons.

Here is my JavaScript code. Currently, the next and previous buttons just cycle through each location.

I am trying to make an image "move" around using keyboard. Repositioning the image within the scene itself. I did manage to add setOnMouseClicked() on the image and change position, but it does not seem to work with the arrow keys. Going to assume I am doing something wrong.

Here is the code: