class_docstr: A writer class whose .write() method is a no-op.
  
  This allows us to create and use a writer object where one is required by
  context but we do not wish to write to any file.
class_docstr_tok: ["A","writer","class","whose",".write","(",")","method","is","a","no-op",".","This","allows","us","to","create","and","use","a","writer","object","where","one","is","required","by","context","but","we","do","not","wish","to","write","to","any","file","."]
code: def write(self, unused_record):
      pass
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import collections
  import re
  import sys
  import time
  from absl import app
  from absl import logging
  from third_party.nucleus.io import bed
  from third_party.nucleus.io import fastq
  from third_party.nucleus.io import gff
  from third_party.nucleus.io import sam
  from third_party.nucleus.io import vcf
label_desc: Use image node_id 2 for calling the NullWriter obj's underlying member method code with example usage: obj.write(unused_record) without return types