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: Exit a `with` block.  Typically, this will close the file.
docstr_tok: ["Exit","a","`","with","`","block",".","Typically",",","this","will","close","the","file","."]
code: def __exit__(self, unused_type, unused_value, unused_traceback):
      """Exit a `with` block.  Typically, this will close the file."""
  
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 4 for calling the GenomicsReader obj's underlying member method code with example usage: obj.__exit__(unused_type, unused_value, unused_traceback) without return types