import xml.etree.ElementTree as ET

tree = ET.parse("a.xml")
root = tree.getroot()
# print(root.tag)
# print(root.attrib)
# print(root.text)

# res=root.iter('year') # 从整个树形结构中寻找
# print(list(res))
# for item in res:
#     print(item.tag,item.attrib,item.text)

# res=root.find('year') # 从当前节点的儿子中查找
# print(res)

# res=root.find('country') # 从当前节点的儿子中查找,找成功 一个就结束
# print(res.attrib)

# res=root.find('country').find('year')
# print(res.text)


# res=root.findall('country') # 从当前节点的儿子中查找,找到所有
# print(res)

# 遍历
# for country in root:
#     print('==============>',country.tag,country.attrib)
#     for item in country:
#         print(item.tag,item.attrib,item.text)


# 改
# for year in root.iter('year'):
    # print(year.text)
    # year.text=str(int(year.text) + 1)
    # print(year.text)
    # year.attrib={'updated':'yes'}
    # year.attrib={}
    # year.attrib.pop('updated')

# tree.write('b.xml')
# tree.write('a.xml')

# 删
# for country in root:
#     rank=country.find('rank')
#     v=int(rank.text)
#     if v > 50:
#         # print(rank.text)
#         root.remove(country)
#
# tree.write('a.xml')

# 增
# for country in root:
    # tag=ET.Element('egon')
    # tag.attrib={'age':"1",'sex':'male'}
    # tag.text='老男孩的最帅的老师'
    # country.append(tag)


# tree.write('a.xml')

for country in root:
    tag=country.find('egon')
    print(tag.text)

二，shelve 模块

import shelve

# userinfo={
#     'egon':{'age':18,'sex':'male'},
#     'alex':{'age':38,'sex':'female'},
# }

f=shelve.open(r'sheve.txt',writeback=True)
# f['egon']={'age':18,'sex':'male'}
# f['alex']={'age':38,'sex':'female'}
# f['egon']['age']=19

print(f['egon']['age'])
f.close()

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