code: def __init__(self):
      self._log_file = None
      self._pos = 0
  
file_path: mars/mars/oscar/backends/mars/tests/test_debug.py
imports: import asyncio
  import logging
  import os
  import sys
  from contextlib import contextmanager
  from io import StringIO
  from typing import List
  import pytest
  from .....None import oscar
  from ....debug import reload_debug_opts_from_env, get_debug_options
label_desc: Use image node_id 1 to create a new DebugActor object from inherited base classes: mo with example: obj = DebugActor()