code: def __str__(self):
      message = self._message
      if len(self._message_stack) > 0:
          message += ":"
          for i in range(len(self._message_stack)):
              message += "\n  [%d] %s" % (i, self._message_stack[i])
      return message
  
imports: import os
  from ctypes import *
  from enum import Enum
  from typing import Sequence
label_desc: Use image node_id 2 for calling the PorcupineError obj's underlying member method code with example usage: obj.__str__() and returns: message