python讀寫xml文件實例詳解嘛

<data>
	<country name="shdi2hajk">231
		<rank>1<NewNode A="1">This is NEW</NewNode></rank>
		<year>2008</year>
		<gdppc>141100</gdppc>
		<neighbor direction="E" name="Austria" />  
		<neighbor direction="W" name="Switzerland" />
	</country>
	<country name="Singapore">
		<rank>4</rank>
		<year>2011</year>
		<gdppc>59900</gdppc>
		<neighbor direction="N" name="Malaysia" />
	</country>
	<country name="Panama">
		<rank>68</rank>
		<year>2011</year>
		<gdppc>13600</gdppc>
		<neighbor direction="W" name="Costa Rica" />
		<neighbor direction="E" name="Colombia" />
	</country>
	<MediaPlatformService height="165" ip="36.32.160.199" passWord="111" port="9084" userName="admin" width="220">
	</MediaPlatformService>
</data>

1.xml一個節點有三個屬性：tag、text、attrib
2. 以第一個子節點country為例：
3. tag代表節點名字,country節點的tag就是它的名字：country
4. text代表節點文本內容,rank節點的text就是1
5. attrib代表節點包含的屬性，以{屬性：值}這樣的字典形式存放。country節點的屬性是{name:Liechtenstein}.name是屬性的鍵，Liechtenstein是屬性的值。{屬性：值}就是一個字典類型，可以使用一切字典方法。
6. country節點的tag為country，attrib為{name:Liechtenstein}，text為空
7. rank節點的tag為rank,attrib為空字典，text為1
8. 綜上所述，xml文檔主要由節點以及節點的三個屬性組成。

import xml.etree.ElementTree as ET
file_path = r'xml_te.xml'
tree = ET.ElementTree(file = file_path)  #讀取xml文件
print(tree.iter())
for i in tree.iter('rank'):  #迭代獲取tag為'rank'的節點
    print(i.text)
nodes = tree.find('country') #獲取第一個tag為country的節點，返回是子節點的迭代對象
print(nodes.tag)
nodes2 = tree.findall('country') #獲取所有tag為country的節點
print(nodes2)
for node in nodes2:
    #打印節點的三個屬性
    print(node.tag)
    print(node.attrib)
    print(node.text)

import xml.etree.ElementTree as ET
file_path = r'xml_te.xml'
tree = ET.ElementTree(file = file_path)  #讀取xml文件

# root = tree.getroot()  #獲取根結點
"""增加新節點"""
net = ET.Element('NewNode')
net.attrib = {'A':"1"}   #節點屬性
net.text = "This is NEW"   #節點文本
node = tree.find('country/rank/NewNode')   #找到需要增加子節點的父節點
node.append(net)
print(node.text)
tree.write(file_path)  #寫入文件
"""修改屬性值"""
sub = tree.find('country')   #找到節點
sub.set('name',"shdi2hajk")  #set(key,new value)
sub.text = '231'
print(sub.attrib)
print(sub.text)
tree.write(file_path)  #寫入文件