code: def file_read():
      watcher = WatcherBase()
      stream = watcher.open_stream(devices=[r"c:\temp\obs.txt"])
      vis = tw.Visualizer(stream, vis_type="mpl-line")
      vis.show()
      plt_loop()
  
file_path: tensorwatch/test/files/file_stream.py
imports: from tensorwatch.watcher_base import WatcherBase
  from tensorwatch.stream import Stream
  from tensorwatch.file_stream import FileStream
  from tensorwatch import LinePlot
  from tensorwatch.image_utils import plt_loop
  import tensorwatch
label_desc: Use image node_id 2 for calling a global function with example usage: file_read() without return types