xml模块

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 　　

```

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)

```

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')

```

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

```