[root@python3 xml]# cat test.xml
<?xml version="1.0"?>
<data><country name="Liechtenstein">                   #国家,country是标签,name是它的属性<rank updated="yes">2</rank>                 #排名<year>2008</year>                            #年份<gdppc>141100</gdppc>                        #gdp<neighbor name="Austria" direction="E"/>     #邻国<neighbor name="Switzerland" direction="W"/> #邻国,这种写法是自闭合的写法</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>

[root@python3 xml]# cat py_xml.py
#!/usr/local/python3/bin/python3
import xml.etree.ElementTree as ETtree = ET.parse("test.xml")   #解析那个xml的数据
root = tree.getroot()         #得到最外层标签data
print(root.tag)

for child in root:            #root是最外层,其他是它的子标签print(child.tag, child.attrib)  #标签名,属性打印for i in child:print(i.tag, i.text)        #子下还有标签,文本

for node in root.iter('year'):print(node.tag, node.text)

[root@python3 xml]# cat py_xml.py
#!/usr/local/python3/bin/python3
import xml.etree.ElementTree as ETtree = ET.parse("xmltest.xml")
root = tree.getroot()
print(root.tag)
[root@python3 xml]# python3 py_xml.py
data

[root@python3 xml]# cat py_xml.py
#!/usr/local/python3/bin/python3
import xml.etree.ElementTree as ETtree = ET.parse("test.xml")
root = tree.getroot()
print(root.tag)for child in root:print(child.tag, child.attrib)
[root@python3 xml]# python3 py_xml.py
data
country {'name': 'Liechtenstein'}  #country: child.tag, {'name': 'Liechtenstein'}是child.attrib
country {'name': 'Singapore'}
country {'name': 'Panama'}

[root@python3 xml]# cat py_xml.py
#!/usr/local/python3/bin/python3
import xml.etree.ElementTree as ETtree = ET.parse("test.xml")
root = tree.getroot()
print(root.tag)for child in root:print(child.tag, child.attrib)for i in child:print(i.tag, i.text)
[root@python3 xml]# python3 py_xml.py
data
country {'name': 'Liechtenstein'} #国家下的文本
rank 2                            #rank: i.tag   2: i.text
year 2008
gdppc 141100
neighbor None                     #neighbor是自定义的标签没有自己的文本内容
neighbor Nonecountry {'name': 'Singapore'}
rank 5
year 2011
gdppc 59900
neighbor Nonecountry {'name': 'Panama'}
rank 69
year 2011
gdppc 13600
neighbor None
neighbor None

[root@python3 xml]# cat py_mod_xml.py
#!/usr/local/python3/bin/python3
import xml.etree.ElementTree as ETtree = ET.parse("test.xml")
root = tree.getroot()for node in root.iter('year'):    #对root下year的标签做循环,node是year的标签,year标签中有text(是那个数字,如2011)new_year = int(node.text) + 1 #对年份的份做修改,处理下,加1,变成新的值,如2011+1 = 2012node.text = str(new_year)     #再转换成字符串,再转换回它的node.textnode.set("updated","yes")     #还有一个updated的属性,使用set来修改tree.write("test1.xml")            #修改完后都在tree对象里,再使用tree调用write方法重新写[root@python3 xml]# python3 py_mod_xml.py
[root@python3 xml]# cat test1.xml
<data><country name="Liechtenstein"><rank updated="yes">2</rank><year updated="yes">2009</year>    #修改了,重新加一个属性<gdppc>141100</gdppc><neighbor direction="E" name="Austria" /><neighbor direction="W" name="Switzerland" /></country><country name="Singapore"><rank updated="yes">5</rank><year updated="yes">2012</year>    ###<gdppc>59900</gdppc><neighbor direction="N" name="Malaysia" /></country><country name="Panama"><rank updated="yes">69</rank><year updated="yes">2012</year>        ####<gdppc>13600</gdppc><neighbor direction="W" name="Costa Rica" /><neighbor direction="E" name="Colombia" /></country>

[root@python3 xml]# cat py_del_xml.py
#!/usr/local/python3/bin/python3
import xml.etree.ElementTree as ETtree = ET.parse("test.xml")
root = tree.getroot()for country in root.findall('country'):        #遍历所有国家rank = int(country.find('rank').text)      #找到排名的标签,取到text(排名的数字)if rank > 50:                               #排名大于50的移除root.remove(country)
tree.write('test2.xml')   [root@python3 xml]# python3 py_del_xml.py
[root@python3 xml]# cat test2.xml
<data><country name="Liechtenstein"><rank updated="yes">2</rank><year>2008</year><gdppc>141100</gdppc><neighbor direction="E" name="Austria" /><neighbor direction="W" name="Switzerland" /></country><country name="Singapore"><rank updated="yes">5</rank><year>2011</year><gdppc>59900</gdppc><neighbor direction="N" name="Malaysia" /></country></data>[root@python3 xml]#

[root@python3 xml]# vim py_create_xml.py
#!/usr/local/python3/bin/python3
import xml.etree.ElementTree as ETnew_xml = ET.Element("namelist")                                  #ET调用Element方法
name1 = ET.SubElement(new_xml,"name", attrib={"enrolled": "yes"})  #ET调用SubElement方法，和属性
age = ET.SubElement(name1, "age", attrib={"checked": "no"})
sex = ET.SubElement(name1, "sex")
age.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("test3.xml", encoding="utf-8", xml_declaration=True)
ET.dump(new_xml)                                                #打印生成格式
[root@python3 xml]# python3 py_create_xml.py
<namelist><name enrolled="yes"><age checked="no">33</age><sex /></name><name enrolled="no"><age>19</age></name></namelist>