from h3 import h3
from shapely.geometry import Polygon,mapping

def dict_to_shapely(d):
    coords = d['features'][0]['geometry']['coordinates'][0]
    return Polygon(coords)

def polygon_to_h3(polygon,resolution):
    polygon = mapping(polygon)
    hexas = h3.polyfill(polygon,res=resolution,geo_json_conformant=True)
    return list(set(hexas))

#read geojson file
with open("sample-bbx.geojson",'r') as f:
    polygon_dict = json.loads(f.read())
    shapely_polygon = dict_to_shapely(polygon_dict)
    f.close()

h3_idx = polygon_to_h3(shapely_polygon,resolution=8)
h3_idx = pd.DataFrame(pd.Series(h3_idx,name='h3'))