code: def get_value(self, sid, dt, field):
          
          try:
              country_code = self._country_code_for_assets([sid])
          except ValueError as exc:
              raise_from(
                  NoDataForSid(
                      'Asset not contained in daily pricing file: {}'.format(sid)
                  ),
                  exc
              )
          return self._readers[country_code].get_value(sid, dt, field)
docs: Retrieve the value at the given coordinates.
  
          Parameters
          ----------
          sid : int
              The asset identifier.
          dt : pd.Timestamp
              The timestamp for the desired data point.
          field : string
              The OHLVC name for the desired data point.
  
          Returns
          -------
          value : float|int
              The value at the given coordinates, ``float`` for OHLC, ``int``
              for 'volume'.
  
          Raises
          ------
          NoDataOnDate
              If the given dt is not a valid market minute (in minute mode) or
              session (in daily mode) according to this reader's tradingcalendar.
          NoDataForSid
              If the given sid is not valid.