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: Enter a `with` block.
docstr_tok: ["Enter","a","`","with","`","block","."]
code: def __enter__(self):
      """Enter a `with` block."""
      return self
  
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 3 for calling the GenomicsReader obj's underlying member method code with example usage: obj.__enter__() and returns: self