如何用Python递归遍历HTML层级结构并提取文件名？

from bs4 import BeautifulSoup

html_content = """

<li>favicon.ico</li>

<li class="expandable">
    <div class="hitarea expandable-hitarea"></div>
    banner-ads
    <ul style="display: block;">
        <li>ad01.png</li>
        <li>ad02.png</li>
        <li>ad03.png</li>
        <li>ad04.png</li>
        <li>ad06.jpg</li>
    </ul>
</li>  
"""

soup = BeautifulSoup(html_content, "html.parser")

def extract_filenames(element, current_path=""):
    if element.name == "li":
        filename = element.text.strip()
        yield f"{current_path}{filename}" if current_path else filename
    elif element.name and element.name != 'code': #忽略code标签
        new_path = f"{current_path}{element.text.strip()}/" if element.text.strip() else current_path
        for child in element.children:
            yield from extract_filenames(child, new_path)

file_paths = list(extract_filenames(soup))
print(file_paths)
#输出：['favicon.ico', 'banner-ads/ad01.png', 'banner-ads/ad02.png', 'banner-ads/ad03.png', 'banner-ads/ad04.png', 'banner-ads/ad06.jpg']