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import geopandas

path_to_data = geopandas.datasets.get_path("nybb")
gdf = geopandas.read_file(path_to_data)

gdf

gdf.to_file("my_file.geojson", driver="GeoJSON")
gdf = gdf.set_index("BoroName")
gdf["area"] = gdf.area
gdf["area"]
gdf['boundary'] = gdf.boundary
gdf['boundary']
gdf.plot("area", legend=True)