如何实现类似博客园文章的批量下载功能？

import requests import os  def download_files(urls, output_dir):     """Bulk download files from a list of URLs.      Args:         urls (list): A list of URLs to download.         output_dir (str): The directory to save the downloaded files to.     """     # Create output directory if it doesn't exist     os.makedirs(output_dir, exist_ok=True)      # Download each file     for url in urls:         # Get filename from URL         filename = url.split("/")[-1]          # Download file         response = requests.get(url)         with open(os.path.join(output_dir, filename), 'wb') as f:             f.write(response.content)  # Example usage urls = ["https://example.com/file1.txt", "https://example.com/file2.zip", "https://example.com/file3.pdf"] output_dir = "downloads"  # Download files download_files(urls, output_dir)