find previous method to find url before specific class 之前的方法

Question

我想找到 class= 'field-news-pillars' 之前的上一个标签 html 看起来像这样：

<span class="field-content"><a href="/news/building-business">Building a Business</a></span>
<div> <div>
<span class="date-display-single">Jun 29, 2020</span></div> </div>
<div> <div>
<div class="field-news-pillars">
    Entrepreneurial Spirit  </div>
</div> </div>

我想获取 class="field-news-pillars" == 'Entrepreneurial Spirit'

上方的 href link

我知道有更简单的方法可以从 html 中找到 href link，但我正在尝试过滤所有 link，我只想select links 是 class="field-news-pillars" 的前一个标签。这是我试过的。

last_link = soup.find(class_='field-news-pillars', text ='Entrepreneurial Spirit' )
print(last_link.find_previous('a')['href'])

error: AttributeError: 'NoneType' object has no attribute 'find_previous'

有什么想法吗？谢谢！

Answer 1

find 需要标签名称。

In [174]: html = """<span class="field-content"><a href="/news/building-business">Building a Business</a></span>
     ...: <div> <div>
     ...: <span class="date-display-single">Jun 29, 2020</span></div> </div>
     ...: <div> <div>
     ...: <div class="field-news-pillars">
     ...:     Entrepreneurial Spirit  </div>
     ...: </div> </div>"""

In [175]: soup = BeautifulSoup(html, "html.parser")

In [176]: last_link = soup.find("div", class_='field-news-pillars')

In [177]: print(last_link.find_previous('a')['href'])
/news/building-business

如果要按文本过滤，

n [189]: import re

In [190]: last_link = soup.find("div", class_='field-news-pillars', text=re.compile('Entrepreneurial Spirit*'))

In [191]: print(last_link.find_previous('a')['href'])
/news/building-business

Answer 2

如果您有 BS4 4.7.1 或更高版本而不使用正则表达式，则使用 css 选择器获取值的另一种方法。

html='''<span class="field-content"><a href="/news/building-business">Building a Business</a></span>
<div> <div>
<span class="date-display-single">Jun 29, 2020</span></div> </div>
<div> <div>
<div class="field-news-pillars">
    Entrepreneurial Spirit  </div>
</div> </div>'''

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

item1=soup.select_one('.field-news-pillars:contains("Entrepreneurial Spirit")')
print(item1.find_previous('a')['href'])

find previous method to find url before specific class 之前的方法

find previous method to find url before specific class

python

beautifulsoup

href

siblings