Beautifulsoup extracking属性类型错误：“NoneType”对象不是可迭代

Question

我用来获取标记该

for a in soup.find_all('img', {'data-event': 'Clicked image'}, 
src=True,alt=True): 
    itemobj = a['src'] + ' --- ' + a['alt'] 

属性现在我在其他网站上工作，当我尝试这样扔类型错误：“NoneType”对象是不是可迭代

song_link = line.find('td').find('a')['href'] (This works well) 
sss = line.find('span')['title'] (This in not working. But when I delete ['title'] part it works and shows inside of the <span> tag 

我的数据：

<span class="rating" title="4.5"> 
      <span class="icon-rating-sm icon-rating-sm__active"></span> 
      <span class="icon-rating-sm icon-rating-sm__active"></span> 
      <span class="icon-rating-sm icon-rating-sm__active"></span> 
      <span class="icon-rating-sm icon-rating-sm__active"></span> 
      <span class="icon-rating-sm icon-rating-sm__half"></span> 
</span> 

我一直在寻找解决THI但到目前为止，他们都没有为我工作。

Answer 1

当我在你提供的数据上试过你的代码时，它对我来说工作得很好，所以我将假设有更多的数据。

soup.find('span')['title'] 

用“span”检查它找到的第一个东西，如果它不包含标题标签，则会引发异常。

例如on

<span></span> 
<span class="rating" title="4.5"> 
     <span class="icon-rating-sm icon-rating-sm__active"></span> 
     <span class="icon-rating-sm icon-rating-sm__active"></span> 
     <span class="icon-rating-sm icon-rating-sm__active"></span> 
     <span class="icon-rating-sm icon-rating-sm__active"></span> 
     <span class="icon-rating-sm icon-rating-sm__half"></span> 
</span> 

该代码不起作用。

至少这是我发生了几次。