code: def get(self, key, default=None):
      return self.__dict__["_config"].get(key, default)
  
imports: from __future__ import annotations
  import os
  import re
  import copy
  import logging
  import platform
  import multiprocessing
  from pathlib import Path
  from typing import Callable, Optional, Union
  from typing import TYPE_CHECKING
  from qlib.constant import REG_CN, REG_US, REG_TW
label_desc: Use image node_id 4 for calling the Config obj's underlying member method code with example usage: obj.get(key, default) and returns: self