code: def save(self, fname):
      self.opt.save(fname + ".opt")
      with open(fname, "w") as f:
          f.write("Lol")
  
imports: import os
  import unittest
  import json
  import parlai.utils.logging
  import parlai.utils.testing
  from parlai.utils.io import PathManager
  from parlai.core.metrics import AverageMetric
  from parlai.core.worlds import create_task
  from parlai.core.opt import Opt
  from parlai.core.params import ParlaiParser
  from parlai.core.agents import register_agent, Agent
  from parlai.scripts.eval_model import get_task_world_logs
label_desc: Use image node_id 5 for calling the FakeReportAgent obj's underlying member method code with example usage: obj.save(fname) without return types