code: def read_unicodestringnl(f):
      r"""
      >>> import io
      >>> read_unicodestringnl(io.BytesIO(b"abc\\uabcd\njunk")) == 'abc\uabcd'
      True
      """
  
      data = f.readline()
      if not data.endswith(b"\n"):
          raise ValueError(
              "no newline found when trying to read " "unicodestringnl"
          )
      data = data[:-1]  # lose the newline
      return str(data, "raw-unicode-escape")
  
imports: import codecs
  import io
  import pickle
  import re
  import sys
  from struct import unpack
  from pickle import decode_long
label_desc: Use image node_id 15 for calling a global function with example usage: read_unicodestringnl(f) and returns: str