Add Geopandas support

Hi,

Thanks for your amazing work, many custom function can now been deprecated and lots of keystroke are saved. If I may have a feature request it would be to support geopandas API for the geo plots.

If you are not familiar with this library, it inherits pd.DataFrame and embedd a custom geometry column that stores the geo object (Points, Polygone, Line …). It would be great if the plots could be done based on the geometry automatically, without casting points, or specifing the that you want polygons…

Tell me if you want more details about this.

[emigre459]

As this is still marked as open I wanted to give it a bump - geopandas support via plotly express would be amazing!

[nicolaskruchten]

Here’s a complete/simple example (edited to remove the unnecessary .__geo_interface__ I’d left in for testing 😃

import numpy as np
import geopandas as gpd
import plotly.express as px

#  GeoJson from French Open-Data (french department)
url = "https://www.data.gouv.fr/fr/datasets/r/90b9341a-e1f7-4d75-a73c-bbc010c7feeb"

# Read file with geopandas
geo_df = gpd.read_file(url)
geo_df['random_color'] = np.random.randint(1, 6, geo_df.shape[0])
fig = px.choropleth_mapbox(geo_df, 
                           geojson=geo_df.geometry, 
                           locations=geo_df.index, 
                           color='random_color',
                           center={"lat": 48.8534, "lon": 2.3488},
                           mapbox_style="open-street-map",
                           zoom=4)
fig.show()