class_docstr: Abstract base class for reading genomics data.
  
  In addition to the abstractmethods defined below, subclasses should
  also set a `header` member variable in their objects.
class_docstr_tok: ["Abstract","base","class","for","reading","genomics","data",".","In","addition","to","the","abstractmethods","defined","below",",","subclasses","should","also","set","a","`","header","`","member","variable","in","their","objects","."]
docstr: Initializer.
docstr_tok: ["Initializer","."]
code: def __init__(self):
      """Initializer."""
      # Some readers can only support one iterator at a time, so don't
      # create one now.  Rather, create it when needed in next().
      self.iterator = None
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import abc
  import errno
  from absl import logging
  import six
  from third_party.nucleus.io.python import tfrecord_reader
label_desc: Use image node_id 5 to create a new GenomicsReader object from inherited base classes: six with example: obj = GenomicsReader()