python 用watchdog observer监听多个文件夹

可以使用watchdog的多个observer实例来监听多个文件夹。下面是一个示例代码：

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__":
    path1 = '/path/to/folder1'
    path2 = '/path/to/folder2'

    event_handler = MyHandler()
    observer1 = Observer()
    observer2 = Observer()

    observer1.schedule(event_handler, path1, recursive=True)
    observer2.schedule(event_handler, path2, recursive=True)

    observer1.start()
    observer2.start()

    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer1.stop()
        observer2.stop()

    observer1.join()
    observer2.join()

这个示例代码使用了两个observer实例，分别监听了`/path/to/folder1`和`/path/to/folder2`两个文件夹。当文件夹中的文件被修改时，会调用`MyHandler`类的`on_modified`方法。