CODE EXAMPLE FOR PYTHON

add label on choropleth map python

import plotly.express as px
import plotly.graph_objects as go
import geopandas as gpd

df = px.data.election()
geojson = px.data.election_geojson()
gdf = (
    gpd.GeoDataFrame.from_features(geojson)
    .merge(df, on="district")
    .assign(lat=lambda d: d.geometry.centroid.y, lon=lambda d: d.geometry.centroid.x)
    .set_index("district", drop=False)
)

# for convenience of rebuilding and adding traces...
def basemap():
    fig = px.choropleth_mapbox(
        df,
        geojson=geojson,
        color="Bergeron",
        locations="district",
        featureidkey="properties.district",
        center={"lat": 45.5517, "lon": -73.7073},
        mapbox_style=mapboxstyle,
#         mapbox_style="carto-positron",
        zoom=9,
    )
    fig.update_layout(margin={"r": 0, "t": 0, "l": 0, "b": 0},
                      mapbox={"accesstoken":mapboxtoken}
                     )
    return fig