一、修改xml文件的节点文本、节点属性、删除节点
from lxml import etree
将string转换成python对象
e1 = etree.XML(xml_content)
读取xml字符串中的指定节点文本与属性
a1 = e1.xpath("//SPEC_LIST/text()") # 节点文本
a1 = e1.xpath("//SPEC_LIST/@class") # 节点属性
添加子节点
obj = e1.xpath("//SPEC_LIST")[0] # 获取节点
spec = etree.SubElement(obj, "SPEC") # 添加子节点
修改节点文本
obj = e1.xpath("//SPEC_LIST")[0] # 获取节点
obj.text = '文本' # 修改节点文本
修改节点属性
obj = e1.xpath("//SPEC_LIST")[0] # 获取节点
obj.attrib['cpu'] = "8" # 设置节点属性,attrib属性是一个字典
将python对象转换成string
content = etree.tounicode(e1) # unicode
content = etree.tostring(e1) # bytes
例子：
from lxml import etree
# xml文件
"""
<breakfast>
<food>
<name>apple</name>
<description file='/etc/libvirt/qemu/apple.xml'></description>
<mac address='123456789'></mac>
</food>
</breakfast>
"""
xml_content = "<breakfast><food><name>apple</name><description file='/etc/libvirt/qemu/apple.xml'></description><mac address='123456789'></mac></food></breakfast>"
"""
实现：
修改name为tomato
修改/etc/libvirt/qemu/apple.xml为 /usr/bin/tomato.xml
删除mac这一行
"""
config = etree.XML(xml_content)
name = config.xpath("//name")[0] # <Element name at 0x256fff06108>
description = config.xpath("//description")[0] # <Element description at 0x256fff06148>
food = config.xpath("//food")[0] # <Element food at 0x256fff061c8>
mac = config.xpath("//mac")[0] # <Element mac at 0x256fff06208>
print(dir(name))
"""
['__bool__', '__class__', '__contains__', '__copy__', '__deepcopy__', '__delattr__', '__delitem__',
'__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__gt__',
'__hash__', '__init__', '__iter__', '__le__', '__len__', '__lt__', '__ne__', '__new__', '__reduce__',
'__reduce_ex__', '__repr__', '__reversed__', '__setattr__', '__setitem__', '__sizeof__', '__str__',
'__subclasshook__', '_init', 'addnext', 'addprevious', 'append', 'attrib', 'base', 'clear', 'cssselect',
'extend', 'find', 'findall', 'findtext', 'get', 'getchildren', 'getiterator', 'getnext', 'getparent',
'getprevious', 'getroottree', 'index', 'insert', 'items', 'iter', 'iterancestors', 'iterchildren',
'iterdescendants', 'iterfind', 'itersiblings', 'itertext', 'keys', 'makeelement', 'nsmap', 'prefix',
'remove', 'replace', 'set', 'sourceline', 'tag', 'tail', 'text', 'values', 'xpath']
"""
name.text = 'tomato'
description.attrib['file'] = '/usr/bin/tomato.xml'
food.remove(mac)
xml_content = etree.tounicode(config)
print(xml_content)
"""
<breakfast>
<food>
<name>tomato</name>
<description file="/usr/bin/tomato.xml"/>
</food>
</breakfast>
"""
二、案例
html页面布局
js渲染页面
编写js：输入值
View Code
编写js：获取值保存到数据库中：
var params_list = [];
// 构造参数Map>> Array (动态参数)
$('#param_se option').each(function () {
// 构造单个参数信息
var txt_param_list = $(this).text().split(":");
var val_param = $(this).prop("value");
var param_id = $(this).attr("param_id");
var param_dict = {
"param_name": txt_param_list[0],
"variable_name": val_param,
"param_value": txt_param_list[1],
"param_id": param_id
};
params_list.push(param_dict)
});
console.log(params_list)
from lxml import etree
root = etree.Element("root")
config = [{'param_name': '主机参数2', 'variable_name': 'hostname2', 'param_value': 'hostname_value2'},
{'param_name': '主机参数1', 'variable_name': 'hostname1', 'param_value': 'hostname_value1'}]
# 动态参数
for c_config in config:
param_node = etree.SubElement(root, "param")
param_node.attrib["param_name"] = c_config["param_name"].strip()
param_node.attrib["variable_name"] = c_config["variable_name"].strip()
param_node.attrib["param_value"] = c_config["param_value"].strip()
config = etree.tounicode(root)
print(config)
"""
<root><param param_name="主机参数2" variable_name="hostname2" param_value="hostname_value2"/>
<param param_name="主机参数1" variable_name="hostname1" param_value="hostname_value1"/></root>
"""
数据库获取通过etree模块展示到前端：
from lxml import etree
config = '<root><param param_name="主机参数2" variable_name="hostname2" param_value="hostname_value2"/><param param_name="主机参数1" variable_name="hostname1" param_value="hostname_value1"/></root>'
param_list = []
pre_config = "<root></root>"
if config:
config = etree.XML(config)
else:
config = etree.XML(pre_config)
param_nodes = config.xpath("//param")
print(param_nodes) # [<Element param at 0x25f8e5ab208>, <Element param at 0x25f8e5ab188>]
for pn in param_nodes:
print(pn.attrib)
"""
{'param_name': '主机参数2', 'variable_name': 'hostname2', 'param_value': 'hostname_value2'}
{'param_name': '主机参数1', 'variable_name': 'hostname1', 'param_value': 'hostname_value1'}
"""
param_list.append({
"param_name": pn.attrib.get("param_name", ""),
"variable_name": pn.attrib.get("variable_name", ""),
"param_value": pn.attrib.get("param_value", ""),
})
print(param_list)
"""
[{'param_name': '主机参数2', 'variable_name': 'hostname2', 'param_value': 'hostname_value2'},
{'param_name': '主机参数1', 'variable_name': 'hostname1', 'param_value': 'hostname_value1'}]
"""
re正则：
param_type = 'HOST'
content = '#!/bin/bash echo "((hostname1))"echo "((hostname2))"'
com = re.compile("\(\((.*?)\)\)")
variable_list = com.findall(content)
print(variable_list) #['hostname1', 'hostname2']
data = []
for i in variable_list:
for j in param_list:
if i.strip() == j["variable_name"]:
data.append({
"param_name": j["param_name"],
"variable_name": j["variable_name"],
"param_value": j["param_value"],
"type": "SCRIPT"
})
break
print(data)
"""
[{'param_name': '主机参数1', 'variable_name': 'hostname1', 'param_value': 'hostname_value1', 'type': 'SCRIPT'},
{'param_name': '主机参数2', 'variable_name': 'hostname2', 'param_value': 'hostname_value2', 'type': 'SCRIPT'}]
"""
