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: Construct from an h5py.File.
  
  Parameters
  ----------
  h5_file : h5py.File
      An HDF5 daily pricing file.
docstr_tok: ["Construct","from","an","h5py.File",".","Parameters","--","--","--","--","--","h5_file",":","h5py.File","An","HDF5","daily","pricing","file","."]
code: def from_file(cls, h5_file):
      """
      Construct from an h5py.File.
  
      Parameters
      ----------
      h5_file : h5py.File
          An HDF5 daily pricing file.
      """
      return cls(
          {
              country: HDF5DailyBarReader.from_file(h5_file, country)
              for country in h5_file.keys()
          }
      )
  
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 2 for calling the MultiCountryDailyBarReader obj's underlying member method code with example usage: obj.from_file(cls, h5_file) and returns: cls