code: def size_from_range(self, start, length):
      if self.size is None:
          return None, None
      if length:
          if length > 0:
              end = length + start
          else:
              assert start is None
              start = self.size + length
              end = self.size
      else:
          end = self.size
  
      if end > self.size:
          end = self.size
      if start >= end:
          return None, None
      return end - start, start
  
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 4 for calling the RandomFile obj's underlying member method code with example usage: obj.size_from_range(start, length) and returns: unknown,  start, None,  None, None,  None