code: def __str__(self):
      try:
          if self.value not in NVMLError._errcode_to_string:
              NVMLError._errcode_to_string[self.value] = str(
                  nvmlErrorString(self.value)
              )
          return NVMLError._errcode_to_string[self.value]
      except NVMLError:
          return f"NVML Error code {self.value}"
  
imports: import os
  import sys
  import ctypes
  import threading
label_desc: Use image node_id 2 for calling the NVMLError obj's underlying member method code with example usage: obj.__str__() and returns: NVMLError, str, self