realtime + fitbounds

fitbounds.py

realtime = Realtime(source, on_each_feature=on_each_feature, interval=10000).add_to(m)
realtime.on(
      update=folium.JsCode(
          """
          (e) => {
              console.log('update ', e.target._map);
              var map = e.target._map;
              var realtime = e.target;
              map.fitBounds(realtime.getBounds(), {maxZoom: 3});
          }
          """
      )
  )