python中的多文件下载和进度条更新

import requests
from tqdm import tqdm
import threading

def download_file(url, file_name):
    response = requests.get(url, stream=True)
    total_size = int(response.headers.get('content-length', 0))
    block_size = 1024
    progress_bar = tqdm(total=total_size, unit='iB', unit_scale=True)
    
    with open(file_name, 'wb') as file:
        for data in response.iter_content(block_size):
            progress_bar.update(len(data))
            file.write(data)
    
    progress_bar.close()

def download_files(file_urls):
    threads = []
    
    for url, file_name in file_urls.items():
        thread = threading.Thread(target=download_file, args=(url, file_name))
        thread.start()
        threads.append(thread)
    
    for thread in threads:
        thread.join()

if __name__ == '__main__':
    file_urls = {
        'https://example.com/file1.txt': 'file1.txt',
        'https://example.com/file2.txt': 'file2.txt',
        'https://example.com/file3.txt': 'file3.txt'
    }
    
    download_files(file_urls)