HTML刮使用LXML

Question

我使用lxml

这是一个职位

<article id="post-4855" class="post-4855 post type-post status-publish format-standard hentry category-uncategorized"> 


<header class="entry-header"> 
    <h1 class="entry-title"><a href="http://aitplacements.com/uncategorized/cybage/" rel="bookmark">Cybage..</a></h1> 
      <div class="entry-meta"> 
     <span class="byline"> Posted by <span class="author vcard"><a class="url fn n" href="http://aitplacements.com/author/tpoait/">TPO</a></span></span><span class="posted-on"> on <a href="http://aitplacements.com/uncategorized/cybage/" rel="bookmark"><time class="entry-date published updated" datetime="2017-09-13T11:02:32+00:00">September 13, 2017</time></a></span><span class="comments-link"> with <a href="http://aitplacements.com/uncategorized/cybage/#respond">0 Comment</a></span>  </div><!-- .entry-meta --> 
     </header><!-- .entry-header --> 

<div class="entry-content"> 
    <p>cybage placement details shared <a href="http://aitplacements.com/uncategorized/cybage/" class="read-more">READ MORE</a></p> 
     </div><!-- .entry-content --> 

的检查元素对于每一个这样的帖子，我想提取标题，内容数据报废发布和发布时间。

例如在上面，详细情况将在

{title : "Cybage..", 
post : "cybage placement details shared" 
datetime="2017-09-13T11:02:32+00:00" 
} 

直到现在什么，我能够实现： 网站需要登录，我在这样做，全成。

用于提取信息：

headers = {'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) 
Chrome/42.0.2311.90'} 
url = 'http://aitplacements.com/news/' 
page = requests.get(url,headers=headers) 
doc = html.fromstring(page.content) 
#print doC# it prints <Element html at 0x7f59c38d2260> 
raw_title = doc.xpath('//h1[@class="entry-title"]/a/@href/text()') 
print raw_title 

的raw_title给空值[]？

我在做什么错了？

Answer 1

@href指href属性的值：

In [14]: doc.xpath('//h1[@class="entry-title"]/a/@href') 
Out[14]: ['http://aitplacements.com/uncategorized/cybage/'] 

您希望<a>元素的文本，而不是：

In [16]: doc.xpath('//h1[@class="entry-title"]/a/text()') 
Out[16]: ['Cybage..'] 

因此，使用

raw_title = doc.xpath('//h1[@class="entry-title"]/a/text()') 
if len(raw_title) > 0: 
    raw_title = raw_title[0] 
else: 
    # handle the case of missing title 
    raise ValueError('Missing title')