code: def is_str(strval):
      return isinstance(strval, (bytes, str))
  
imports: import base64
  import json
  import os
  import re
  import sys
  import shutil
  import tempfile
  import textwrap
  import zipfile
label_desc: Use image node_id 1 for calling the _Formatting obj's underlying member method code with example usage: obj.is_str(strval) and returns: isinstance