如何選擇一切，但使用beautifulsoup4某個html元素？

Question

例子：

import bs4 

html = ''' 
<div class="short-description std "> 
<em>Android Apps Security</em> provides guiding principles for how to 
best design and develop Android apps with security in mind. The book explores 
techniques that developers can use to build additional layers of security into 
their apps beyond the security controls provided by Android itself.    
<p class="scroll-down">∨ <a href="#main-desc" onclick="Effect.ScrollTo(
'main-desc', { duration:'0.2'}); return false;">Full Description</a> ∨</p></div> 
''' 
soup = bs4.BeautifulSoup(html) 

我如何從soup以下（一beautifulsoup對象）？

<div class="short-description std "> 
<em>Android Apps Security</em> provides guiding principles for how to 
best design and develop Android apps with security in mind. The book explores 
techniques that developers can use to build additional layers of security into 
their apps beyond the security controls provided by Android itself.    
</div> 

Answer 1

簡單地進行搜索：

soup.find('p', class_='scroll-down') 

我使用了類限制查找，但因爲沒有其他p元素，這是一個有點多餘這裏。

相反，如果你需要刪除標記，用上面的方法先找到它，然後在其上調用.extract()從文件中刪除：

>>> soup.find('p', class_='scroll-down').extract() 
<p class="scroll-down"> <a href="#main-desc" onclick="Effect.ScrollTo(
'main-desc', { duration:'0.2'}); return false;">Full Description</a> </p> 
>>> print soup 

<div class="short-description std "> 
<em>Android Apps Security</em> provides guiding principles for how to 
best design and develop Android apps with security in mind. The book explores 
techniques that developers can use to build additional layers of security into 
their apps beyond the security controls provided by Android itself.    
</div> 

兩件事情：刪除的標籤從.extract()方法返回，您可以保存它以備後用。標籤完全從文檔中刪除，如果您仍然需要它在文檔中，則必須稍後手動重新添加標籤。

或者，您可以使用.decompose() method，它將完全刪除文檔中的標籤，而不返回引用。標籤然後永遠消失。