code: def __init__(self, username: str, token: str):
      self.username = username
      self.token = token
  
imports: import argparse
  import contextlib
  import functools
  import getpass
  import hashlib
  import json
  import pathlib
  from typing import Any, Callable, Dict, Iterator, List, NamedTuple, Optional, Tuple, cast
  import filelock
  import determined
  from determined.common import api, constants, util
  from determined.common.api import bindings, certs
label_desc: Use image node_id 1 to create a new UsernameTokenPair object  with example: obj = UsernameTokenPair(username, token)