这是xml文件 http://www.diveintopython3.net/examples/feed.xml
我的python代码：
from lxml import etree
def lxml():
tree = etree.parse('feed.xml')
NSMAP = {"nn":"http://www.w3.org/2005/Atom"}
test = tree.xpath('//nn:category[@term="html"]/..',namespaces=NSMAP)
for elem in tree.iter():
print(elem.tag,'\t',elem.attrib)
print('-------------------------------')
test1 = tree.xpath('//nn:category',namespaces=NSMAP)
print('++++++++++++++++++++++++++++++++')
for node in test1:
test2 = node.xpath('./../nn:summary',namespaces=NSMAP) # return a list
print(test2.xpath('normalize-space(.)'))
print('*****************************************')
test3 = tree.xpath('//text()[normalize-space(.)]')# [normalize-space()] only remove the heading and tailing
print(test3)
输出是：..
++++++++++++++++++++++++++++++++
['Putting an entire chapter on one page sounds\n bloated, but consider this — my longest chapter so far\n would be 75 printed pages, and it loads in under 5 seconds…\n On dialup.']
['Putting an entire chapter on one page sounds\n bloated, but consider this — my longest chapter so far\n would be 75 printed pages, and it loads in under 5 seconds…\n On dialup.']
['Putting an entire chapter on one page sounds\n bloated, but consider this — my longest chapter so far\n would be 75 printed pages, and it loads in under 5 seconds…\n On dialup.']
['The accessibility orthodoxy does not permit people to\n question the value of features that are rarely useful and rarely used.']
['These notes will eventually become part of a\n tech talk on video encoding.']
['These notes will eventually become part of a\n tech talk on video encoding.']
['These notes will eventually become part of a\n tech talk on video encoding.']
['These notes will eventually become part of a\n tech talk on video encoding.']
['These notes will eventually become part of a\n tech talk on video encoding.']
['These notes will eventually become part of a\n tech talk on video encoding.']
['These notes will eventually become part of a\n tech talk on video encoding.']
['These notes will eventually become part of a\n tech talk on video encoding.']
*****************************************
['\n ', 'dive into mark', '\n ', 'currently between addictions', '\n ', 'tag:diveintomark.org,2001-07-29:/', '\n ', '2009-03-27T21:56:07Z', '\n ', '\n ', '\n ', '\n ', '\n ', 'Mark', '\n ', 'http://diveintomark.org/', '\n ', '\n ', 'Dive into history, 2009 edition', '\n ', '\n ', 'tag:diveintomark.org,2009-03-27:/archives/20090327172042', '\n ', '2009-03-27T21:56:07Z', '\n ', '2009-03-27T17:20:42Z', '\n ', '\n ', '\n ', '\n ', 'Putting an entire chapter on one page sounds\n bloated, but consider this — my longest chapter so far\n would be 75 printed pages, and it loads in under 5 seconds…\n On dialup.', '\n ', '\n ', '\n ', '\n ', 'Mark', '\n ', 'http://diveintomark.org/', '\n ', '\n ', 'Accessibility is a harsh mistress', '\n ', '\n ', 'tag:diveintomark.org,2009-03-21:/archives/20090321200928', '\n ', '2009-03-22T01:05:37Z', '\n ', '2009-03-21T20:09:28Z', '\n ', '\n ', 'The accessibility orthodoxy does not permit people to\n question the value of features that are rarely useful and rarely used.', '\n ', '\n ', '\n ', '\n ', 'Mark', '\n ', '\n ', 'A gentle introduction to video encoding, part 1: container formats', '\n ', '\n ', 'tag:diveintomark.org,2008-12-18:/archives/20081218155422', '\n ', '2009-01-11T19:39:22Z', '\n ', '2008-12-18T15:54:22Z', '\n ', '\n ', '\n ', '\n ', '\n ', '\n ', '\n ', '\n ', '\n ', 'These notes will eventually become part of a\n tech talk on video encoding.', '\n ', '\n']..
我的问题是为什么有这么多'\ n'。如何删除它们？
另外一个问题是如何直接查询文本的标签，例如make来获取“Mark”节点（条目文本的子节点。
非常感谢
答案 0 :(得分：1)
＆＃34; 我的问题是为什么有这么多＆＃39; \ n＆＃39;。如何删除它们？＆＃34;
您的XPath将选择XML中的每个空格。格式良好的XML通常包含大量的换行符和空格。例如，在下面的XML中，有两个空文本节点将由//text()选择，即<root>和<foo>之间的一个，以及</foo>和{{之间的另一个1}}：
</root>您可以使用<root>
<foo>bar</foo>
</root>
来避免首先选择空文本节点。
＆＃34; 另外一个问题是如何直接查询文本的标签，例如make以获取＆＃34; Mark＆＃34;的节点。 （参赛作品的孩子。＆＃34;
//text()[normalize-space()]上面应该得到变量your_text_node.getparent().tag
引用的文本节点的父元素，然后返回元素的标记名称。
答案 1 :(得分：1)