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
xml的格式如下,就是通过节点来区别数据结构的:
=
"Liechtenstein"
>
=
"yes"
>
2
/
rank>
=
"yes"
>
2010
/
year>
141100
/
gdppc>
=
"E"
name
=
"Austria"
/
>
=
"W"
name
=服务器托管网
"Switzerland"
/
>
/
country>
=
"Singapore"
>
=
"yes"
>
5
/
rank>
=
"yes"
>
2013
/
year>
59900
/
gdppc>
=
"N"
name
=
"Malaysia"
/
>
/
country>
=
"Panama"
>
=
"yes"
>
69
/
rank>
=
"yes"
>
2013
/
year>
13600
/
gdppc>
=
"W"
name
=
"Costa Rica"
/
>
=
"E"
name
=
"Colombia"
/
>
/
country>
/
data>
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.E服务器托管网lementTree 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)
# 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
# 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
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
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
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