如何在python中监控文件下载？

import requests

url = 'http://example.com/file.txt'
response = requests.get(url)

with open('file.txt', 'wb') as file:
    file.write(response.content)

from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler

class FileEventHandler(FileSystemEventHandler):
    def on_created(self, event):
        # 处理文件创建事件
        if not event.is_directory:
            print(f'File created: {event.src_path}')

    def on_modified(self, event):
        # 处理文件修改事件
        if not event.is_directory:
            print(f'File modified: {event.src_path}')

    def on_deleted(self, event):
        # 处理文件删除事件
        if not event.is_directory:
            print(f'File deleted: {event.src_path}')

observer = Observer()
event_handler = FileEventHandler()

# 监听当前目录
observer.schedule(event_handler, path='.', recursive=False)
observer.start()

import requests
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler

class FileEventHandler(FileSystemEventHandler):
    def __init__(self, url):
        self.url = url

    def on_created(self, event):
        # 处理文件创建事件
        if not event.is_directory:
            print(f'File created: {event.src_path}')
            # 下载文件
            response = requests.get(self.url)
            with open(event.src_path, 'wb') as file:
                file.write(response.content)

url = 'http://example.com/file.txt'

observer = Observer()
event_handler = FileEventHandler(url)

# 监听当前目录
observer.schedule(event_handler, path='.', recursive=False)
observer.start()