watchdog用来监控指定目录/文件的变化，如添加删除文件或目录、修改文件内容、重命名文件或目录等，每种变化都会产生一个事件，且有一个特定的事件类与之对应，然后再通过事件处理类来处理对应的事件，怎么样处理事件完全可以自定义，只需继承事件处理类的基类并重写对应实例方法。

#-*- coding:utf-8 -*-

import sys
import time
import logging
from watchdog.observers import Observer
from watchdog.events import LoggingEventHandler
 
if __name__ == "__main__":
    logging.basicConfig(level=logging.INFO,
                        filename='watchdog.log',
                        format='%(asctime)s - %(message)s',
                        datefmt='%Y-%m-%d %H:%M:%S')
    path = sys.argv[1] if len(sys.argv) > 1 else '.'
    event_handler = LoggingEventHandler()
    observer = Observer()
    observer.schedule(event_handler, path, recursive=True)
    observer.start()
    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer.stop()
    observer.join()

自定义事件类型代码

import time
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler
 
class MyHandler(FileSystemEventHandler):
    def on_modified(self, event):
        if event.src_path == "/home/sapser/scripts/test.log":      
            print "log file %s changed!" % event.src_path
 
if __name__ == "__main__":
    event_handler = MyHandler()
    observer = Observer()
    observer.schedule(event_handler, path='.', recursive=False)
    observer.start()
    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer.stop()
    observer.join()

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