code: def __getitem__(self, key: str) -> Any:
      if key in self.__cache:
          return self.__cache[key]
      elif key in arg_defaults:
          return arg_defaults[key]
      raise KeyError(f"Can't find key {key} in ArgCache")
  
imports: import json
  import os
  from typing import Any
label_desc: Use image node_id 4 for calling the ArgCache obj's underlying member method code with example usage: obj.__getitem__(key) and returns: self, arg_defaults