code: def __del__(self):
      if not self.full:
          self.close()
  
imports: import binascii
  import collections
  import os
  import pickle
  from datetime import datetime
  from struct import calcsize, pack, unpack
  from pfrl.collections.random_access_queue import RandomAccessQueue
label_desc: Use image node_id 4 for calling the _ChunkWriter obj's underlying member method code with example usage: obj.__del__() without return types