code: def __getitem__(self, index: int) -> "ExpState":
      return self.revs[index]
  
imports: import json
  from dataclasses import asdict, dataclass, field
  from datetime import datetime
  from typing import TYPE_CHECKING, Any, Dict, Iterator, List, Literal, Optional
  from dvc.exceptions import DvcException
  from dvc.repo.metrics.show import _gather_metrics
  from dvc.repo.params.show import _gather_params
  from dvc.utils import relpath
label_desc: Use image node_id 3 for calling the ExpRange obj's underlying member method code with example usage: obj.__getitem__(index) and returns: self