code: def file_exists(self, filename):
      return os.path.exists(filename)
  
file_path: PARL/parl/remote/tests/support_RegExp_test.py
imports: import unittest
  import os
  import shutil
  import parl
  import time
  import threading
  from parl.remote import exceptions
  from parl.utils import logger
  from parl.utils.test_utils import XparlTestCase
label_desc: Use image node_id 1 for calling the Actor obj's underlying member method code with example usage: obj.file_exists(filename) and returns: os