docs: def load_csv_data(resource_name):
      # type: (str) -> List[str]
      """ Loads first column of specified CSV file from package data.
      """
      data_bytes = pkgutil.get_data('clkhash', 'data/{}'.format(resource_name))
      if data_bytes is None:
          raise ValueError("No data resource found with name {}".format(resource_name))
      else:
          data = data_bytes.decode('utf8')
          reader = csv.reader(data.splitlines())
          next(reader, None)  # skip the headers
          return [row[0] for row in reader]