code: def descriptor_to_key(self, descriptor):
      return (
          descriptor.descriptor_type.value,
          descriptor.command,
          tuple(descriptor.path or tuple()),
      )
  
imports: import ast
  import logging
  import threading
  import time
  import uuid
  import pyarrow
  import pyarrow.flight
label_desc: Use image node_id 2 for calling the FlightServer obj's underlying member method code with example usage: obj.descriptor_to_key(descriptor) and returns: descriptor,  descriptor,  tuple