code: def create_file(self, name):
      ss = self.SubStream(self._temp, self._buffersize)
      self._streams[name] = ss
      return StructFile(ss)
  
imports: import errno
  import os
  import sys
  from threading import Lock
  from shutil import copyfileobj
  from whoosh.compat import BytesIO, memoryview_
  from whoosh.filedb.structfile import BufferFile, StructFile
  from whoosh.filedb.filestore import FileStorage, StorageError
  from whoosh.system import emptybytes
  from whoosh.util import random_name
label_desc: Use image node_id 2 for calling the CompoundWriter obj's underlying member method code with example usage: obj.create_file(name) and returns: StructFile