Python Watchdog 实行对文件或目录的监控

watchdog 库支持多平台，受到越来越多的关注。顾名思义，watchdog库就是对文件或者目录（event）来监控以及作出反应。我们对文件作出删除，生成，修改和移动时，event就代表你所做的行为传入到FileSystemEvent类进行处理，然后通过FileSystemEventHandler来作出反应。

FileSystemEvent(event)—>FileSystemEventHandler(event)

即：

watchdog.event.Dir/FileDeletedEvent(event)**—>**self.on_deleted(event)

watchdog.event.Dir/FileCreatedEvent(event)**—>**self.on_created(event)

watchdog.event.Dir/FileModifiedEvent(event)**—>**self.on_modified(event)

watchdog.event.Dir/FileMovedEvent(event)**—>**self.on_moved(event)

以上这些监控和改变均是通过watchdog.observers.Observer()来实现的。

以下为官方实例：

import sys
import time
import logging
from watchdog.observers import Observer
from watchdog.events import LoggingEventHandler

if __name__ == "__main__":
logging.basicConfig(level=logging.INFO,
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()