code: def test_list_named_actors_namespace(ray_start_regular):
      """Verify that actor names are filtered on namespace by default."""
      address = ray_start_regular["address"]
  
      driver_script_1 = """
  import ray
  ray.init(address="{}", namespace="test")
  
  @ray.remote
  class A:
      pass
  
  A.options(name="hi", lifetime="detached").remote()
  
  assert len(ray.util.list_named_actors()) == 1
  assert ray.util.list_named_actors() == ["hi"]
  assert ray.util.list_named_actors(all_namespaces=True) == \
      [dict(name="hi", namespace="test")]
  """.format(
          address
      )
  
      run_string_as_driver(driver_script_1)
  
      assert not ray.util.list_named_actors()
      assert ray.util.list_named_actors(all_namespaces=True) == [
          {"name": "hi", "namespace": "test"}
      ]
  
      driver_script_2 = """
  import ray
  ray.init(address="{}", namespace="test")
  
  assert ray.util.list_named_actors() == ["hi"]
  assert ray.util.list_named_actors(all_namespaces=True) == \
      [dict(name="hi", namespace="test")]
  ray.kill(ray.get_actor("hi"), no_restart=True)
  assert not ray.util.list_named_actors()
  """.format(
          address
      )
  
      run_string_as_driver(driver_script_2)
      assert not ray.util.list_named_actors()
      assert not ray.util.list_named_actors(all_namespaces=True)
  
imports: import pytest
  import sys
  import ray
  from ray._private.test_utils import run_string_as_driver
label_desc: Use image node_id 1 for calling a global function with example usage: test_list_named_actors_namespace(ray_start_regular) without return types