code: def main():
      file_write()
      file_read()
  
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 3 for calling a global function with example usage: main() without return types