docs: def get_new_nodes(fname):
      """
      Return an iterator of dicts given a .csv-format file.
      """
  
      with open(fname, 'rU') as infile:
          infile = (line for line in infile if not line.startswith('#'))
          reader = list(csv.DictReader(infile))
          rows = (d for d in reader if d['tax_id'])
  
      # for now, children are provided as a semicolon-delimited list
      # within a cell (yes, yuck). We need to convert thit into a list
      # if present.
      for d in rows:
          if 'children' in d:
              if d['children']:
                  d['children'] = [x.strip() for x in d['children'].split(';')]
              else:
                  del d['children']
          yield d