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:
xml处理方式
# Author:Sooele 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)
xml修改、删除
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'
)
xml样板
<?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>