使用os.listdir()監控文件目錄：
#!/usr/bin/env python
#-*- coding=utf-8 -*-
#filename: monitor_dir.py
import os
import time
monitor_dir = "/opt/"
now_file = dict([(f,None)for f in os.listdir(monitor_dir)])
while True:
new_file = dict([(f,None)for f in os.listdir(monitor_dir)])
added = [f for f in new_file if not f in now_file]
removed = [f for f in now_file if not f in new_file]
if added:
print ("Added:",",".join(added))
if removed:
print ("Removed:",",".join(removed))
now_file = new_file