我有一个XML文件,希望删除节点中具有给定属性=值的所有内容,但无法使元素树.remove()
方法正常工作。我得到一个list.remove(x): x not in list
错误
如果我有一个div,包含多个段落和列表元素,具有属性v1-9,deleted
,我希望能够删除整个div及其所有内容
import xml.etree.ElementTree as ET
#get target file
tree = ET.parse('tested.htm')
#pull into element tree
root = tree.getroot()
#confirm output
print(root)
#define xlmns tags
MadCap = {'MadCap': 'http://www.madcapsoftware.com/Schemas/MadCap.xsd'}
i=1
j=6
# specify state
state = "state.deleted-in-vers"
# specify version
vers = "version-number.v{}-{}".format(i,j)
# combine to get conditional string might need to double up b/c of order mattering here???
search = ".//*[@MadCap:conditions='{},{}']".format(vers,state)
#get matching elements
for elem in root.findall(search, MadCap):
print('---PARENT---')
print(elem)
print('attributes:', elem.attrib)
print('text:', elem.text)
elem.text = " "
elem.attrib = {}
for child in elem.iter():
print('-child element-')
print(child)
elem.remove(child)
print('==========')
为了简单起见,我省略了上面I和j上的循环
下面是目标xml的一个片段,您可以看到这些属性是如何使用的
<div MadCap:conditions="state.deleted-in-vers,version-number.v1-9">
<h4>Example with password prompts</h4>
<p>In the following example:</p>
<ul>
<li>We have included the value <code>connection.ask-pass</code>, so are being prompted for the password of the setup user. </li>
<li>This host has an installation user <code>hub-setup</code>. </li>
<li>We are installing to the host <code>hub.example.com</code>. We must provide the FQDN of the host.</li>
<li>The KeyStore we are installing to the <MadCap:variable name="Components/gateway-hub.gateway-hub-name" /> hosts is located at <code>/tmp/ssl_keystore</code> on the installation machine.</li>
<li>The TrustStore we are installing to the <MadCap:variable name="Components/gateway-hub.gateway-hub-name" /> hosts is located at <code>/tmp/ssl_truststore</code> on the installation machine.</li>
<li>We are not providing any of the password key-value pairs, and therefore are being prompted for the passwords. </li>
<li>This host has a runtime user <code>hub</code>.<ul><li>The runtime user is in group <code>gateway-hub</code>.</li></ul></li>
</ul>
<p>The <MadCap:variable name="3rd-party-products/formats.json-name" /> configuration file is the following:</p><pre xml:space="preserve">{
"connection": {
"ask_pass": true,
"user": "hub-setup"
},
"hosts": ["hub.example.com"],
"hub": {<MadCap:conditionalText MadCap:conditions="state.new-in-vers,version-number.v1-6">
"user" : "hub",
"group" : "gateway-hub",</MadCap:conditionalText>
"ssl": {
"key_store": "/tmp/ssl_keystore",
"trust_store": "/tmp/ssl_truststore"
}
}<MadCap:conditionalText MadCap:conditions="version-number.v1-6,state.deleted-in-vers">
"ansible" : {
"variables" : {
"hub_user": "hub",
"hub_group": "gateway-hub"
}
}</MadCap:conditionalText>
}</pre>
</div>
<div MadCap:conditions="state.deleted-in-vers,version-number.v1-9">
<h4>Example using SSH key</h4>
<p>In the next example:</p>
<ul>
<li>The SSH key for the setup user is located at <code>~/.ssh/HUB-SETUP-KEY.pem</code> on the installation machine, specified with <code>connection.private_key</code>. </li>
<li>The hosts have an installation user <code>hub-setup</code>. We must provide the FQDN of the host.</li>
<li>The hosts are specified in a list in a newline-delimited file at <code>/tmp/hosts</code> on the installation machine. </li>
<li>The KeyStore we are installing to the <MadCap:variable name="Components/gateway-hub.gateway-hub-name" /> hosts is located at <code>/tmp/ssl_keystore</code> on the installation machine.</li>
<li>The TrustStore we are installing to the <MadCap:variable name="Components/gateway-hub.gateway-hub-name" /> hosts is located at <code>/tmp/ssl_truststore</code> on the installation machine.</li>
<li>We are providing the passwords.</li>
<li>There is a runtime user on every host called <code>hub</code>.<ul><li>The runtime user is in group <code>gateway-hub</code>.</li></ul></li>
</ul>
<p>The <MadCap:variable name="3rd-party-products/formats.json-name" /> configuration file is the following:</p><pre xml:space="preserve">{
"connection": {
"private_key": "~/.ssh/HUB-SETUP-KEY.pem",
"user": "hub-setup"
},
"hosts_file": "/tmp/hosts",
"hub": {<MadCap:conditionalText MadCap:conditions="state.new-in-vers,version-number.v1-6">
"user" : "hub",
"group" : "gateway-hub",</MadCap:conditionalText>
"ssl": {
"key_store": "/tmp/ssl_keystore",
"key_store_password" "hub123",
"trust_store": "/tmp/ssl_truststore",
"trust_store_password": "hub123",
"key_password": "hub123"
}
}<MadCap:conditionalText MadCap:conditions="version-number.v1-6,state.deleted-in-vers">
"ansible" : {
"variables" : {
"hub_user": "hub",
"hub_group": "gateway-hub"
}
}</MadCap:conditionalText>
}</pre>
</div>
我发现使用lxml更容易完成任务,因为删除元素更容易
请尝试以下代码:
当然,在目标版本中,添加将此树保存到 输出文件
要使用单个根元素正确格式化XML, 我将您的内容封装在:
编辑
在我以前的解决方案中,我使用
it.getparent().remove(it)
删除 有问题的因素。 但后来我发现了一个缺陷,如果源代码 XML包含“混合内容”,即删除元素后的“尾部”文本也被删除(但不应删除)为了防止它,我添加了remove\u元素函数,以仅删除 元素本身并调用它,而不是以前的it.getparent().remove(it)
在评论中一个问题之后的解释
attrTxt的源是attr字典(当前元素的属性)的内容。 这个片段实际上是在没有大括号的情况下打印这本词典的。 它仅用于跟踪,无需进一步使用
另一方面,dct起着更重要的作用。 它的来源是cond,包含条件属性的内容 当前元素),例如状态。在版本号为v1-6的版本中新增
这段代码:
然后,vn接收版本号(v1-6)和st-状态 (新版本)。 这是一个实质性的情报嵌入在这里。 因为这两个片段可以以不同的顺序出现,所以不能创建 任何匹配所有可能情况的XPath表达式。 但是如果你检查上述变量,很明显 元件是否应为可拆卸元件
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