code: def get_tokens_file() -> str:
      default_enduser_token_file = os.path.expanduser(
          "~/.hail/tokens.json"
      )
      return (
          first_extant_file(
              os.environ.get("HAIL_TOKENS_FILE"),
              default_enduser_token_file,
              "/user-tokens/tokens.json",
          )
          or default_enduser_token_file
      )
  
imports: from typing import Optional, Dict, Tuple
  import base64
  import collections.abc
  import os
  import json
  import logging
  from hailtop.config import get_deploy_config
  from hailtop.utils import first_extant_file
label_desc: Use image node_id 1 for calling the Tokens obj's underlying member method code with example usage: obj.get_tokens_file() and returns: unknown