code: def main():
  
      parser = argparse.ArgumentParser(
          description='''Extract subgraph(s) from XGMML network(s).''')
      parser.add_argument('ids',
                          type=str,
                          help='identifier or file path to identifier list')
      parser.add_argument('-c', '--column',
                          default=1,
                          type=int,
                          help='''column number for identifiers in identifier list file
                          (default = 1)''')
      parser.add_argument('-s', '--source',
                          default='./source_xgmml/',
                          help='''source file or directory path(s) to database XGMML
                          (default = directory named "source_xgmml"
                              in current working directory)''')
      parser.add_argument('-t', '--type',
                          default='rna',
                          help='input type (rna or protein; default = rna)')
      parser.add_argument('-o', '--output',
                          default='./',
                          help='''output directory path
                          (default = current working directory)''')
      
      parser.add_argument('-d', '--debug',
                          default=False,
                          type=bool,
                          help='Show debug messages (default = False)')
      args = parser.parse_args()
  
      node_ids = args.ids
      source_xgmml = args.source
      node_id_list_column_index = args.column - 1
      node_type = args.type
      output_dir = args.output
      #cache = args.cache
      cache = True
      debug = args.debug
  
      return TargetInteractionFinder(
          source_xgmml=source_xgmml,
          node_ids=node_ids,
          node_id_list_column_index=node_id_list_column_index,
          node_type=node_type,
          output_dir=output_dir,
          cache=cache,
          debug=debug)
docs: parser.add_argument('--cache',
                          default=True,
                          type=bool,
                          help='''Cache source_xgmml graph(s) and use in
                          subsequent runs to reduce parse time
                          (default = True)''')