code: def cast_unicode(s, encoding=None):
      if isinstance(s, bytes):
          return s.decode(encoding or a_good_encoding(), "replace")
      return s
  
imports: from __future__ import absolute_import, division, print_function
  import array
  import codecs
  import importlib
  import inspect
  import math
  import platform
  import re
  import sys
  import time
  from base64 import b64encode
  from collections import namedtuple
label_desc: Use image node_id 7 for calling a global function with example usage: cast_unicode(s, encoding) and returns: s, s