如何下载URL存储在xml文档中的多个文件？

import xml.etree.ElementTree as ET
import requests
import os

# 假设XML文件内容如下：
# <files>
#     <file url="http://example.com/file1.txt" />
#     <file url="http://example.com/file2.txt" />
# </files>

# 解析XML文件
tree = ET.parse('files.xml')
root = tree.getroot()

# 创建一个目录来保存下载的文件
download_dir = 'downloads'
if not os.path.exists(download_dir):
    os.makedirs(download_dir)

# 遍历XML中的每个文件节点并下载文件
for file_elem in root.findall('file'):
    url = file_elem.get('url')
    filename = url.split('/')[-1]
    filepath = os.path.join(download_dir, filename)
    
    response = requests.get(url)
    if response.status_code == 200:
        with open(filepath, 'wb') as f:
            f.write(response.content)
        print(f'Downloaded {filename}')
    else:
        print(f'Failed to download {filename}')

print('Download completed.')