code: def write_networks(folder, network_table, networks):
      
      makedirs(folder, exist_ok=True) 
      network_table.to_perseus(path.join(folder, 'networks.txt'), main_columns=[])
      for guid, network in networks.items():
          network['node_table'].to_perseus(path.join(folder, '{}_nodes.txt'.format(guid)), main_columns=[])
          network['edge_table'].to_perseus(path.join(folder, '{}_edges.txt'.format(guid)), main_columns=[])
docs: Writing networkTable, nodes and edges to Perseus readable format.
      
      :param folder: Path to output directory.
      :param network_table: Network table.
      :param networks: Dictionary with node and edge tables, indexed by network guid.