code: def __enter__(self):
      return self
  
imports: from typing import Dict, Any, Sequence
  from .lv_types import EventData, StreamItem, StreamCreateRequest, VisArgs
  from .evaler import Evaler
  from .stream import Stream
  from .stream_factory import StreamFactory
  from .filtered_stream import FilteredStream
  import uuid, time, functools
  from .None import utils
  from .notebook_maker import NotebookMaker
label_desc: Use image node_id 4 for calling the WatcherBase obj's underlying member method code with example usage: obj.__enter__() and returns: self