leaflet.nix

let
  np = import <nixpkgs> { };

  ext = py-self: py-super: {
          folium = py-super.folium.overridePythonAttrs ( oldAttrs : {
                      version = "0.10.0";
            src = np.fetchFromGitHub { owner = "mpickering"
                                     ; repo = "folium"
                                     ; rev = "1bf7edb92f5800c2873869c7b208995435c0fcde"
                                     ; sha256 = "0cl07ygl3hzs2h2nb0cyjwc14y6i9dj63bi6v7ymf48bassifmdv";
          };
  }); };

  new-py = np.python3.override { packageOverrides = ext; };

in
  with np;
  mkShell { buildInputs = [(new-py.withPackages (ps: with ps; [ ps.gdal ps.folium ]))]; }