code: def _GetIntegerValue(self, row, value_name):
      
      value = row.get(value_name, None)
      try:
        return int(value, 10)
      except (TypeError, ValueError):
        return None
docs: Converts a specific value of the row to an integer.
  
      Args:
        row (dict[str, str]): fields of a single row, as specified in COLUMNS.
        value_name (str): name of the value within the row.
  
      Returns:
        int: value or None if the value cannot be converted.