XML模块

<?xml version="1.0"?>
<data>
    <country name="Liechtenstein">
        <rank updated="yes">2</rank>
        <year>2008</year>
        <gdppc>141100</gdppc>
        <neighbor name="Austria" direction="E"/>
        <neighbor name="Switzerland" direction="W"/>
    </country>
    <country name="Singapore">
        <rank updated="yes">5</rank>
        <year>2011</year>
        <gdppc>59900</gdppc>
        <neighbor name="Malaysia" direction="N"/>
    </country>
    <country name="Panama">
        <rank updated="yes">69</rank>
        <year>2011</year>
        <gdppc>13600</gdppc>
        <neighbor name="Costa Rica" direction="W"/>
        <neighbor name="Colombia" direction="E"/>
    </country>
</data>

# print(root.iter('year')) #全文搜索
# print(root.find('country')) #在root的子节点找，只找一个
# print(root.findall('country')) #在root的子节点找，找所有

import xml.etree.cElementTree as ET

tree=ET.parse('a.xml')
root=tree.getroot()

'''三种查找节点的方式'''
'''=======================================查'''
# res=root.iter('rank')   #会在整个树中进行查找，而且是查找到所有
# for item in res:
#     print(item)
#     print('='*50)
#     print(item.tag) #标签名
#     print(item.attrib)  #属性
#     print(item.text)    #文本内容
#
#
# res=root.find('country')  #只能在当前元素下一级开始查找，并且只找到一个就解释
# print(res.tag)
# print(res.attrib)
# print(res.text)
#
# nh=res.find('neighbor')
# print(nh.attrib)
#
# cy=root.findall('country')  #只能在当前元素下一级开始查找
# print([item.attrib for item in cy])


'''=======================================改'''
# for year in root.iter('year'):
#     year.text=str(int(year.text)+10)
#     year.attrib={'updated':'yes'}
#
# tree.write('b.xml')
# tree.write('a.xml')


'''=======================================增加'''
for country in root.iter('country'):
    # print(country)
    year=country.find('year')
    if int(year.text)>2020:
        print(country.attrib)
        ele=ET.Element('egon')
        ele.attrib={'nb':'yes'}
        ele.text='非常帅'
        country.append(ele)
tree.write('b.xml')


'''=======================================删除'''
# for country in root.iter('country'):
#     # print(country)
#     year=country.find('year')
#     if int(year.text) > 2020:
#         # print(country.attrib)
#         # ele=ET.Element('egon')
#         # ele.attrib={'nb':'yes'}
#         # ele.text='非常帅'
#         # country.append(ele)
#         country.remove(year)
# tree.write('b.xml')