code: def __init__(self, prefix, fname, size):
      self.key = os.path.join(prefix, fname)
      self.prefix = prefix
      self.fname = fname
      self.size = size
      self._data = None
  
imports: import os
  import sys
  import zlib
  import json
  from uuid import uuid4
  from hashlib import sha1
  from collections import namedtuple
  from metaflow.plugins.datatools.s3 import S3PutObject
  from metaflow.util import to_fileobj, to_bytes, url_quote
  import numpy
  from ..None import s3client, S3ROOT
label_desc: Use image node_id 1 to create a new RandomFile object from inherited base classes: object with example: obj = RandomFile(prefix, fname, size)