code: def get_spot_value(self, assets, field, dt, data_frequency):
      if field == "price":
          field = "close"
  
      return retry(
          action=self._get_spot_value,
          attempts=self.attempts["get_spot_value_attempts"],
          sleeptime=self.attempts["retry_sleeptime"],
          retry_exceptions=(ExchangeRequestError,),
          cleanup=lambda: log.warn("fetching spot value again."),
          args=(assets, field, dt, data_frequency),
      )
  
imports: import abc
  import datetime
  import numpy
  import pandas
  from catalyst.assets._assets import TradingPair
  from catalyst.constants import LOG_LEVEL, AUTO_INGEST
  from catalyst.data.data_portal import DataPortal
  from catalyst.exchange.exchange_bundle import ExchangeBundle
  from catalyst.exchange.exchange_errors import ExchangeRequestError, PricingDataNotLoadedError
  from catalyst.exchange.utils.exchange_utils import resample_history_df, group_assets_by_exchange
  from catalyst.exchange.utils.datetime_utils import get_frequency, get_start_dt
  from logbook import Logger
  from redo import retry
label_desc: Use image node_id 6 for calling the DataPortalExchangeBase obj's underlying member method code with example usage: obj.get_spot_value(assets, field, dt, data_frequency) and returns: retry