class_docstr: Parameters
  ---------
  readers : dict[str -> SessionBarReader]
      A dict mapping country codes to SessionBarReader instances to
      service each country.
class_docstr_tok: ["Parameters","--","--","--","--","-","readers",":","dict","[","str","-",">","SessionBarReader","]","A","dict","mapping","country","codes","to","SessionBarReader","instances","to","service","each","country","."]
docstr: Get the latest day on or before ``dt`` in which ``asset`` traded.
  
  If there are no trades on or before ``dt``, returns ``pd.NaT``.
  
  Parameters
  ----------
  asset : zipline.asset.Asset
      The asset for which to get the last traded day.
  dt : pd.Timestamp
      The dt at which to start searching for the last traded day.
  
  Returns
  -------
  last_traded : pd.Timestamp
      The day of the last trade for the given asset, using the
      input dt as a vantage point.
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code: def get_last_traded_dt(self, asset, dt):
      """
      Get the latest day on or before ``dt`` in which ``asset`` traded.
  
      If there are no trades on or before ``dt``, returns ``pd.NaT``.
  
      Parameters
      ----------
      asset : zipline.asset.Asset
          The asset for which to get the last traded day.
      dt : pd.Timestamp
          The dt at which to start searching for the last traded day.
  
      Returns
      -------
      last_traded : pd.Timestamp
          The day of the last trade for the given asset, using the
          input dt as a vantage point.
      """
      country_code = self._country_code_for_assets([asset.sid])
      return self._readers[country_code].get_last_traded_dt(asset, dt)
  
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 12 for calling the MultiCountryDailyBarReader obj's underlying member method code with example usage: obj.get_last_traded_dt(asset, dt) and returns: self