我有这个XML代码,取自this link:
<?xml version="1.0" encoding="UTF-8"?>
<rss xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:media="http://search.yahoo.com/mrss/" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:nyt="http://www.nytimes.com/namespaces/rss/2.0" version="2.0">
<channel>
<item>
<title>‘This Did Not Go Well’: Inside PG&E’s Blackout Control Room</title>
<dc:creator>Ivan Penn</dc:creator>
<pubDate>Sat, 12 Oct 2019 17:03:11 +0000</pubDate>
</item>
</channel>
</rss>
[当我尝试使用lxml
并在documentation for xpath and XML namespaces之后解析它时,解析器会找到标题(不使用名称空间),但找不到作者/创建者,但会:
from lxml import html
xml = """
<?xml version="1.0" encoding="UTF-8"?>
<rss xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:media="http://search.yahoo.com/mrss/" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:nyt="http://www.nytimes.com/namespaces/rss/2.0" version="2.0">
<channel>
<item>
<title>‘This Did Not Go Well’: Inside PG&E’s Blackout Control Room</title>
<dc:creator>Ivan Penn</dc:creator>
<pubDate>Sat, 12 Oct 2019 17:03:11 +0000</pubDate>
</item>
</channel>
</rss>
"""
rss = html.fromstring(xml)
items = rss.xpath("//item")
for item in items:
title = item.xpath("title")[0].text_content().strip()
print(title)
ns = {"dc" : "http://purl.org/dc/elements/1.1"}
authors = item.xpath("dc:creator", namespaces = ns)
print(authors)
此代码打印:
此操作进展不顺利:在PG&E的停电控制室中[]
因为它可以正确找到title标签的内容,所以我认为它是在查找单个<item>
标签。我如何将名称空间传递给xpath
有问题吗?
我想这很简单,因为您没有使用相同的名称空间URI,但却忘记了名称空间在输入中的结尾斜线,因此请尝试
ns = {"dc" : "http://purl.org/dc/elements/1.1/"}