Folow

#!/usr/bin/env python3

import os
import time

from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler

class TreeHandler(FileSystemEventHandler):
    def on_modified(self, event):
        with open("/tmp/tree","r") as f:
            os.system('clear')
            print(f.read())


if __name__ == "__main__":
    eh = TreeHandler()
    ob = Observer()
    ob.schedule(eh, path='/tmp', recursive=False)
    ob.start()
    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        ob.stop()
    observer.join()