code: def __init__(self, key: str) -> None:
      self.key = key
  
file_path: wandb/wandb/apis/reports/_helpers.py
imports: from typing import Optional
  from ..public import PanelMetricsHelper, Run
  from .runset import Runset
  from .util import Attr, Base, Panel, nested_get, nested_set
label_desc: Use image node_id 1 to create a new LineKey object  with example: obj = LineKey(key)