docs: def get_report_raw(year, report_type):
      """Download and extract a CO-TRACER report.
  
      Generate a URL for the given report, download the corresponding archive,
      extract the CSV report, and interpret it using the standard CSV library.
  
      @param year: The year for which data should be downloaded.
      @type year: int
      @param report_type: The type of report that should be downloaded. Should be
          one of the strings in constants.REPORT_TYPES.
      @type report_type: str
      @return: A DictReader with the loaded data. Note that this data has not
          been interpreted so data fields like floating point values, dates, and
          boolean values are still strings.
      @rtype: csv.DictReader
      """
      if not is_valid_report_type(report_type):
          msg = '%s is not a valid report type.' % report_type
          raise ValueError(msg)
  
      url = get_url(year, report_type)
      raw_contents = get_zipped_file(url)
      return csv.DictReader(cStringIO.StringIO(raw_contents))