code: def quandl_bundle(environ,
                    asset_db_writer,
                    minute_bar_writer,
                    daily_bar_writer,
                    adjustment_writer,
                    calendar,
                    start_session,
                    end_session,
                    cache,
                    show_progress,
                    output_dir):
      
      api_key = environ.get('QUANDL_API_KEY')
      if api_key is None:
          raise ValueError(
              "Please set your QUANDL_API_KEY environment variable and retry."
          )
  
      raw_data = fetch_data_table(
          api_key,
          show_progress,
          environ.get('QUANDL_DOWNLOAD_ATTEMPTS', 5)
      )
      asset_metadata = gen_asset_metadata(
          raw_data[['symbol', 'date']],
          show_progress
      )
      asset_db_writer.write(asset_metadata)
  
      symbol_map = asset_metadata.symbol
      sessions = calendar.sessions_in_range(start_session, end_session)
  
      raw_data.set_index(['date', 'symbol'], inplace=True)
      daily_bar_writer.write(
          parse_pricing_and_vol(
              raw_data,
              sessions,
              symbol_map
          ),
          show_progress=show_progress
      )
  
      raw_data.reset_index(inplace=True)
      raw_data['symbol'] = raw_data['symbol'].astype('category')
      raw_data['sid'] = raw_data.symbol.cat.codes
      adjustment_writer.write(
          splits=parse_splits(
              raw_data[[
                  'sid',
                  'date',
                  'split_ratio',
              ]].loc[raw_data.split_ratio != 1],
              show_progress=show_progress
          ),
          dividends=parse_dividends(
              raw_data[[
                  'sid',
                  'date',
                  'ex_dividend',
              ]].loc[raw_data.ex_dividend != 0],
              show_progress=show_progress
          )
      )
docs: quandl_bundle builds a daily dataset using Quandl's WIKI Prices dataset.
  
      For more information on Quandl's API and how to obtain an API key,
      please visit https://docs.quandl.com/docs#section-authentication