import xml.etree.ElementTree as ET

new_xml=ET.Element('personinfolist')  #最外面的標(biāo)簽名
personinfo=ET.SubElement(new_xml,'personinfo',attrib={'enrolled':'aaa'}) #對應(yīng)的參數(shù)是：父級標(biāo)簽是誰，當(dāng)前標(biāo)簽名，當(dāng)前標(biāo)簽屬性與值
name=ET.SubElement(personinfo,'name')
name.text='xaoming'
age=ET.SubElement(personinfo,'age',attrib={'checked':'yes'})
age.text='23'

personinfo2=ET.SubElement(new_xml,'personinfo',attrib={'enrolled':'bbb'})
name=ET.SubElement(personinfo2,'name')
name.text='xaokong'
age=ET.SubElement(personinfo2,'age',attrib={'checked':'no'})
age.text='20'

et=ET.ElementTree(new_xml)
et.write('text1.xml',encoding='utf-8',xml_declaration=True)#生成text1.xml

import xml.etree.ElementTree as ET
tree=ET.parse('text1.xml')
root=tree.getroot()
print(root.tag)
#遍歷 xml 文檔
for i in root:
  print(i.tag,i.attrib)  # tag是指標(biāo)簽名，attrib 是指標(biāo)簽里的屬性，text 是指標(biāo)簽內(nèi)容
  for j in i:
    print(j.tag,j.attrib,j.text)
    for k in j:
      print(k.tag,k.attrib,k.text)
#只遍歷 year 標(biāo)簽
for w in root.iter('year'): #只遍歷指定標(biāo)簽
  print(w.tag,w.text)

import xml.etree.ElementTree as ET
tree=ET.parse('text1.xml')
root=tree.getroot()
print(root.tag)
#修改 xml
for node in root.iter('year'): #要修改的標(biāo)簽
  new_year=int(node.text)+1
  node.text=str(new_year)
  node.set('updsted_by','kong') #給這個標(biāo)簽（year）添加新的屬性 key：value
tree.write('text1.xml')   #再吧數(shù)據(jù)寫回去

import xml.etree.ElementTree as ET
tree=ET.parse('text1.xml')
root=tree.getroot()
for country in root.findall('country'):  #會取這個標(biāo)簽所有的數(shù)據(jù)
  rank=int(country.find('rank').text)
  if rank > 50:
    root.remove(country)  #刪除數(shù)據(jù)
tree.write('output.xml') #再把數(shù)據(jù)寫回文件