import ipyleaflet as ipyl
import ipywidgets as ipyw
import json

# Map and label widgets
map = ipyl.Map(center=[53.88, 27.45], zoom=4)
label = ipyw.Label(layout=ipyw.Layout(width='100%'))

# geojson layer with hover handler
with open('./europe_110.geo.json') as f:
    data = json.load(f)
for feature in data['features']:
    feature['properties']['style'] = {
        'color': 'grey',
        'weight': 1,
        'fillColor': 'grey',
        'fillOpacity': 0.5
    }
layer = ipyl.GeoJSON(data=data, hover_style={'fillColor': 'red'})

def hover_handler(event=None, feature=None, id=None, properties=None):
    label.value = properties['geounit']

layer.on_hover(hover_handler)
map.add_layer(layer)


ipyw.VBox([map, label])