code: def __getitem__(self, key):
      if isinstance(key, slice):
          indices = range(*key.indices(len(self)))
          return CheckpointList([self[i] for i in indices])
      return super().__getitem__(key)
  
imports: import datetime
  import os
  import io
  import tempfile
  import json
  import sys
  import html
  from typing import Optional, Dict, Any, List, BinaryIO, TYPE_CHECKING, MutableSequence
  from .None import console
  from .json import CustomJSONEncoder
  from .metadata import rfc3339_datetime, parse_rfc3339
  from .validate import check_path
label_desc: Use image node_id 5 for calling the CheckpointList obj's underlying member method code with example usage: obj.__getitem__(key) and returns: super, CheckpointList