class_docstr: Parameters
  ---------
  readers : dict[str -> SessionBarReader]
      A dict mapping country codes to SessionBarReader instances to
      service each country.
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docstr: Get currencies in which prices are quoted for the requested sids.
  
  Assumes that a sid's prices are always quoted in a single currency.
  
  Parameters
  ----------
  sids : np.array[int64]
      Array of sids for which currencies are needed.
  
  Returns
  -------
  currency_codes : np.array[S3]
      Array of currency codes for listing currencies of ``sids``.
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code: def currency_codes(self, sids):
      """Get currencies in which prices are quoted for the requested sids.
  
      Assumes that a sid's prices are always quoted in a single currency.
  
      Parameters
      ----------
      sids : np.array[int64]
          Array of sids for which currencies are needed.
  
      Returns
      -------
      currency_codes : np.array[S3]
          Array of currency codes for listing currencies of ``sids``.
      """
      country_code = self._country_code_for_assets(sids)
      return self._readers[country_code].currency_codes(sids)
  
imports: from functools import partial
  import h5py
  import logbook
  import numpy
  import pandas
  from six import iteritems, raise_from, viewkeys
  from six.moves import reduce
  from zipline.data.bar_reader import NoDataAfterDate, NoDataBeforeDate, NoDataForSid, NoDataOnDate
  from zipline.data.session_bars import CurrencyAwareSessionBarReader
  from zipline.utils.memoize import lazyval
  from zipline.utils.numpy_utils import bytes_array_to_native_str_object_array
  from zipline.utils.pandas_utils import check_indexes_all_same
label_desc: Use image node_id 13 for calling the MultiCountryDailyBarReader obj's underlying member method code with example usage: obj.currency_codes(sids) and returns: self