code: def write_opref(self, opref):
      self.write_encoded_opref(str(opref))
  
imports: import os
  import random
  import threading
  import time
  import uuid
  import yaml
  from guild import opref
  from guild import util
  from guild import yaml_util
label_desc: Use image node_id 7 for calling the Run obj's underlying member method code with example usage: obj.write_opref(opref) without return types