可以使用Python的recursive函数，来实现find_all方法的泛化。

示例代码：

from bs4 import BeautifulSoup

def filter_tags(element): if element.has_attr('class') and 'news' in element['class']: return True else: return False

def find_all(root, filter_func): results = [] if filter_func(root): results.append(root) for child in root.children: if child.name is not None: results += find_all(child, filter_func) return results

html_doc = """

The Dormouse's story

Once upon a time there were three little sisters; and their names were

• Elsie
• Lacie
• Tillie

...

soup = BeautifulSoup(html_doc, 'html.parser')

使用filter_tags函数过滤class为news的标签

news_tags = find_all(soup.html, filter_tags)

for tag in news_tags: print(tag.prettify())