class_docstr: Writer class for HDF5 files consumed by HDF5FXRateReader.
      
code: def __init__(self, group, date_chunk_size=HDF5_FX_DEFAULT_CHUNK_SIZE):
      self._group = group
      self._date_chunk_size = date_chunk_size
  
imports: from interface import implements
  import h5py
  from logbook import Logger
  import numpy
  import pandas
  from zipline.utils.memoize import lazyval
  from zipline.utils.numpy_utils import bytes_array_to_native_str_object_array
  from .base import FXRateReader, DEFAULT_FX_RATE
  from .utils import check_dts, is_sorted_ascending
label_desc: Use image node_id 1 to create a new HDF5FXRateWriter object from inherited base classes: object with example: obj = HDF5FXRateWriter(group, date_chunk_size)