python xml模块

2021-07-11 19:05

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标签:direct   cost   dump   公司   str   write   打印   选择   16px   

1、基本概念

xml是实现不同语言或程序之间进行数据交换的协议,跟json差不多,但json使用起来更简单。

不过,古时候,在json还没诞生的黑暗年代,大家只能选择用xml呀。

至今很多传统公司如金融行业的很多系统的接口还主要是xml。

xml的格式如下,就是通过节点来区别数据结构的:

"1.0"?>
"Liechtenstein">
        "yes">22008141100"Austria" direction="E"/>
        "Switzerland" direction="W"/>
    "Singapore">
        "yes">5201159900"Malaysia" direction="N"/>
    "Panama">
        "yes">69201113600"Costa Rica" direction="W"/>
        "Colombia" direction="E"/>
    

xml协议在各个语言里的都 是支持的,在python中可以用以下模块操作xml

2、遍历xml文档


import xml.etree.ElementTree as ET
tree = ET.parse("xmltest.xml")
root = tree.getroot()
print(root.tag)
#遍历xml文档
for child in root:
    print(child.tag, child.attrib)
    for i in child:
        print(i.tag,i.text)

#只遍历year 节点
for node in root.iter(year):
    print(node.tag,node.text)

3、修改和删除xml文档内容

import xml.etree.ElementTree as ET

tree = ET.parse("xmltest.xml")
root = tree.getroot()

#修改
for node in root.iter(year):
    new_year = int(node.text) + 1
    node.text = str(new_year)
    node.set("updated","yes")

tree.write("xmltest.xml")


#删除node
for country in root.findall(country):
   rank = int(country.find(rank).text)
   if rank > 50:
     root.remove(country)

tree.write(output.xml)

4、自己创建xml文档

import xml.etree.ElementTree as ET

new_xml = ET.Element("namelist")
name = ET.SubElement(new_xml,"name",attrib={"enrolled":"yes"})
age = ET.SubElement(name,"age",attrib={"checked":"no"})
sex = ET.SubElement(name,"sex")
sex.text = 33
name2 = ET.SubElement(new_xml,"name",attrib={"enrolled":"no"})
age = ET.SubElement(name2,"age")
age.text = 19

et = ET.ElementTree(new_xml) #生成文档对象
et.write("test.xml", encoding="utf-8",xml_declaration=True)

ET.dump(new_xml) #打印生成的格式

 

python xml模块

标签:direct   cost   dump   公司   str   write   打印   选择   16px   

原文地址:https://www.cnblogs.com/foremostxl/p/9550954.html


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