Python xml文件解析

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（1）xml文件

<?xml version="1.0" encoding="utf-8"?>
<Schools>
<School Name="XiDian">
<Class Id="030612">
<Student Name="salomon">
<Scores>
<Math>98</Math>
<English>85</English>
<physics>89</physics>
</Scores>
</Student>
<Student Name="Jupiter">
<Scores>
<Math>74</Math>
<English>83</English>
<physics>69</physics>
</Scores>
</Student>
</Class>
<Class Id="030611">
<Student Name="Venus">
<Scores>
<Math>98</Math>
<English>85</English>
<physics>89</physics>
</Scores>
</Student>
<Student Name="Mars">
<Scores>
<Math>74</Math>
<English>83</English>
<physics>69</physics>
</Scores>
</Student>
</Class>
</School>
</Schools>

（2）xml文件解析

方法一：

import xml.dom.minidom as minidom

dom = minidom.parse("C:\\Users\\lenovo\\Desktop\\aaa\\my1.xml")
root = dom.getElementsByTagName("Schools") #The function getElementsByTagName returns NodeList.
print(root.length)

for node in root:
print("Root element is %s。" %node.tagName)# 格式化输出，与C系列语言有很大区别。
schools = node.getElementsByTagName("School")
for school in schools:
print(school.nodeName)
print(school.tagName)
print(school.getAttribute("Name"))
print(school.attributes["Name"].value)
classes = school.getElementsByTagName("Class")
print("There are %d classes in school %s" %(classes.length, school.getAttribute("Name")))
for mclass in classes:
print(mclass.getAttribute("Id"))
for student in mclass.getElementsByTagName("Student"):
print(student.attributes["Name"].value)
print(student.getElementsByTagName("English")[0].nodeValue) #这个为什么啊？
print(student.getElementsByTagName("English")[0].childNodes[0].nodeValue)

student.getElementsByTagName("English")[0].childNodes[0].nodeValue = 75

方法二：

from xml.etree.ElementTree import ElementTree

tree = ElementTree()
tree.parse("C:\\Users\\lenovo\\Desktop\\aaa\\my1.xml")
root = tree.getroot()
print(root.tag)
print(root[0].tag)
print(root[0].attrib)
schools = root.getchildren()
for school in schools:
print(school.get("Name"))
classes = school.findall("Class")
for mclass in classes:
print(mclass.items())
print(mclass.keys())
print(mclass.attrib["Id"])
math = mclass.find("Student").find("Scores").find("Math")
print(math.text)
math.set("teacher", "bada")

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