lxml - 使用 lxml 删除带有文本的元素

Question

我有以下xml文件

<xml>
  <network id="5">
    <nodelist>
      <IP>10.10.0.135::3111</IP>
      <IP>10.10.0.130::3111</IP>
      <IP>10.10.0.129::3111</IP>
      <IP>10.10.0.129::3111</IP>
    </nodelist>
    <nodelist2/>
  </network>
</xml>

我想删除 IP 为 10.10.0.129 且网络 id=5 的所有元素。我怎样才能在 lxml 中做到这一点？

目前，我正在尝试使用 xpath 查找节点并尝试将其删除。

但是，

netid=xml.xpath("network[@id=%s]/nodelist/IP[contains(text(),%s)]"%(id,node))

给我错误 lxml.etree.XPathEvalError: Invalid expression。

Answer 1

我是一名 python 程序员，所以我用 python 2.7 编写了它。如果你需要使用不同的语言，你将不得不自己移植它，因为我除了 Python 什么都不做。

请注意，虽然这看似处理 xpath，但我的大部分处理是使用 python 完成的。

import lxml.etree as etree  #import etree, like c's include

def delete(xml,networkid,ipaddr):
    tree = etree.fromstring(xml)
    networks = tree.findall('.//network[@id="%s"]'%str(networkid)) #I think you forgot the quotes in your insertion.  
    for network in networks:  #for each network that has id='5'.
        ips = network.findall('.//IP') #All the IP elements under the network
        for ip in ips:  #iterating through a list of ips
            if ipaddr in ip.text:  #if ipaddr is inside the text, even if a port is appended
                ip.getparent().remove(ip)  #the ip's parent (nodelist) removes the ip element
return tree  # I give you the tree


s = r'''<xml>  #Here's your original xml
  <network id="5">
    <nodelist>
      <IP>10.10.0.135::3111</IP>
      <IP>10.10.0.130::3111</IP>
      <IP>10.10.0.129::3111</IP>
      <IP>10.10.0.129::3111</IP>
    </nodelist>
    <nodelist2/>
  </network>
</xml>'''

res = delete(s,'5','10.10.0.129')  #here's the result
print res  #and it's a tree.
print list(res.iter())  #so I print all the items under it.
print etree.tostring(res)  #and you have your edited xml.