code: def __str__(self):
      return f"{self.message} : {self.error_code}"
  
imports: import enum
  import inspect
  import itertools
  import json
  import logging
  import os
  import re
  from functools import wraps
  from warnings import warn
  import yaml
label_desc: Use image node_id 2 for calling the PredictionException obj's underlying member method code with example usage: obj.__str__() and returns: self, str, self