选择两个节点之间的兄弟节点

问题描述：

我必须收集所有类别名称及其下的所有div，并以'config-entry'开始。选择两个节点之间的兄弟节点

<h2>category 1</h2> 
<div class='clear10'></div> 
<div class='config-entry selected-block'>...</div> 
<div class='config-entry '>...</div> 
<div class='config-entry '>...</div> 
<div class='config-entry '>...</div> 
<h2>category 2</h2> 
<div class='clear10'></div> 
<div class='config-entry selected-block'>...</div> 
<div class='config-entry '>...</div> 
<div class='config-entry '>...</div> 
<div class='config-entry '>...</div> 
<div class='config-entry '>...</div> 
<h2>category 3</h2> 
<div class='clear10'></div> 
<div class='config-entry selected-block'>...</div> 
<div class='config-entry '>...</div> 
<h2>category 4</h2> 
<div class='clear10'></div> 
<div class='config-entry selected-block'>...</div> 
<div class='config-entry '>...</div> 
<div class='config-entry '>...</div> 
<div class='config-entry '>...</div>

我使用XPath //h2[1]/following-sibling::h2[1]/preceding-sibling::div[starts-with(@class,'config-entry')]这样的：

categories = root.xpath("//h2") 
for i in xrange(len(categories)): 
    print "----%s----" % categories[i].text 
    contents = root.xpath("//h2[1]/following-sibling::h2[1]/preceding-sibling::div[starts-with(@class,'config-entry')]") 
    print len(contents)

此代码仅适用于1类作品好选择第1类和2之间的所有div但砸了以后。我玩过h2[1]，将它改为0,2,3，但没有具体。任何线索？

答

我建议使用h2标签和div标签，这将返回他们在文档顺序，然后当你处理它们，每个格“属于”的工会最后h2你所看到的。

E.g.

'//h2|//div[contains(@class,"config-entry")]'

工作例如：

from lxml import etree 

doc = etree.HTML(""" 
<html> 
<h2>category 1</h2> 
<div class='clear10'></div> 
<div class='config-entry selected-block'>...</div> 
<div class='config-entry '>...</div> 
<div class='config-entry '>...</div> 
<div class='config-entry '>...</div> 
<h2>category 2</h2> 
<div class='clear10'></div> 
<div class='config-entry selected-block'>...</div> 
<div class='config-entry '>...</div> 
<div class='config-entry '>...</div> 
<div class='config-entry '>...</div> 
<div class='config-entry '>...</div> 
<h2>category 3</h2> 
<div class='clear10'></div> 
<div class='config-entry selected-block'>...</div> 
<div class='config-entry '>...</div> 
<h2>category 4</h2> 
<div class='clear10'></div> 
<div class='config-entry selected-block'>...</div> 
<div class='config-entry '>...</div> 
<div class='config-entry '>...</div> 
<div class='config-entry '>...</div> 
</html>""") 

category = None 
for ele in doc.xpath('//h2|//div[contains(@class,"config-entry")]'): 
    if ele.tag == 'h2': 
    category = str(ele.text) 
    else: 
    if category: 
     print "%s: %s, %r" % (category,ele.tag,ele.attrib)

产量：

category 1: div, {'class': 'config-entry selected-block'} 
category 1: div, {'class': 'config-entry '} 
category 1: div, {'class': 'config-entry '} 
category 1: div, {'class': 'config-entry '} 
category 2: div, {'class': 'config-entry selected-block'} 
category 2: div, {'class': 'config-entry '} 
category 2: div, {'class': 'config-entry '} 
category 2: div, {'class': 'config-entry '} 
category 2: div, {'class': 'config-entry '} 
category 3: div, {'class': 'config-entry selected-block'} 
category 3: div, {'class': 'config-entry '} 
category 4: div, {'class': 'config-entry selected-block'} 
category 4: div, {'class': 'config-entry '} 
category 4: div, {'class': 'config-entry '} 
category 4: div, {'class': 'config-entry '}

+1那工作.. – jerrymouse 2012-03-28 10:12:42

选择两个节点之间的兄弟节点

相关推荐