Python看门狗监控文件变化

Question

伙计们，我需要查看一个日志文件来查看更改。在看完stackoverflow的问题后，我看到有人推荐“看门狗”。所以我正在尝试测试，不确定在文件更改时在何处添加代码：

#!/usr/bin/python
import time
from watchdog.observers import Observer
from watchdog.events import LoggingEventHandler

if __name__ == "__main__":
    event_handler = LoggingEventHandler()
    observer = Observer()
    observer.schedule(event_handler, path='.', recursive=False)
    observer.start()
    try:
        while True:
            time.sleep(1)
        else:
            print "got it"
    except keyboardInterrupt:
        observer.stop()
    observer.join()

如果文件已经添加/更改，我应该在while循环中在哪里添加“got it”？

Answer 1

这里有一个代码片段，可以防止它运行两倍于@alecxe answer中其他人的评论：

from datetime import datetime, timedelta

class MyHandler(FileSystemEventHandler):
    def __init__(self):
        self.last_modified = datetime.now()

    def on_modified(self, event):
        if datetime.now() - self.last_modified < timedelta(seconds=1):
            return
        else:
            self.last_modified = datetime.now()
        print(f'Event type: {event.event_type}  path : {event.src_path}')
        print(event.is_directory) # This attribute is also available

Answer 2

而不是LoggingEventHandler定义处理程序：

#!/usr/bin/python
import time
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler


class MyHandler(FileSystemEventHandler):
    def on_modified(self, event):
        print(f'event type: {event.event_type}  path : {event.src_path}')


if __name__ == "__main__":
    event_handler = MyHandler()
    observer = Observer()
    observer.schedule(event_handler, path='/data/', recursive=False)
    observer.start()

    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer.stop()
    observer.join()

修改文件或目录时调用on_modified。