Updates for @Kelvinrr comments

    js = json_graph.node_link_data(network)

    with ZipFile(projectname, 'w') as pzip:

        js_str = json.dumps(js, cls=NumpyEncoder, sort_keys=True, indent=4)

        print(js_str)

        pzip.writestr('graph.json', js_str)

        # Write the array node_attributes to hdf

        for n, data in network.nodes_iter(data=True):

            ndarrays_to_write = {}

            for k, v in data.__dict__.items():

                print(k, v)

                if isinstance(v, np.ndarray):

                    ndarrays_to_write[k] = v

                elif isinstance(v, pd.DataFrame):