code: def _bundle_to_csv(
      self,
      asset,
      exchange_name,
      data_frequency,
      filename,
      path=None,
      start_dt=None,
      end_dt=None,
  ):
      bundle = ExchangeBundle(exchange_name)
      reader = bundle.get_reader(data_frequency, path=path)
  
      if start_dt is None:
          start_dt = reader.first_trading_day
  
      if end_dt is None:
          end_dt = reader.last_available_dt
  
      if data_frequency == "daily":
          end_dt = end_dt - pd.Timedelta(hours=23, minutes=59)
  
      arrays = None
      try:
          arrays = reader.load_raw_arrays(
              sids=[asset.sid],
              fields=["open", "high", "low", "close", "volume"],
              start_dt=start_dt,
              end_dt=end_dt,
          )
      except Exception as e:
          log.warn(
              "skipping ctable for {} from {} to {}: {}".format(
                  asset.symbol, start_dt, end_dt, e
              )
          )
  
      periods = bundle.get_calendar_periods_range(
          start_dt, end_dt, data_frequency
      )
      df = get_df_from_arrays(arrays, periods)
  
      folder = os.path.join(
          tempfile.gettempdir(), "catalyst", exchange_name, asset.symbol
      )
      ensure_directory(folder)
  
      path = os.path.join(folder, filename + ".csv")
  
      log.info("creating csv file: {}".format(path))
      print("HEAD\n{}".format(df.head(100)))
      print("TAIL\n{}".format(df.tail(100)))
      df.to_csv(path)
      pass
  
imports: import os
  import tempfile
  from logging import getLogger
  import pandas
  from catalyst.exchange.exchange_bcolz import BcolzExchangeBarReader, BcolzExchangeBarWriter
  from catalyst.exchange.exchange_bundle import ExchangeBundle, BUNDLE_NAME_TEMPLATE
  from catalyst.exchange.utils.bundle_utils import get_bcolz_chunk, get_df_from_arrays
  from catalyst.exchange.utils.datetime_utils import get_start_dt
  from catalyst.exchange.utils.exchange_utils import get_exchange_folder
  from catalyst.exchange.utils.factory import get_exchange
  from catalyst.exchange.utils.stats_utils import df_to_string
  from catalyst.utils.paths import ensure_directory
label_desc: Use image node_id 14 for calling the TestExchangeBundle obj's underlying member method code with example usage: obj._bundle_to_csv(asset, exchange_name, data_frequency, filename, path, start_dt, end_dt) without return types