python解析xml

python解析xml

import xml.dom.minidom as minidom

dom = minidom.parse("aa.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",school.nodeName)

        print("school.tagName:",school.tagName)

        print("school.getAttribute:",school.getAttribute("Name"))

        print("school.getAttribute.value:",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",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)

                print(student.getElementsByTagName('ll')[0].childNodes[0].nodeValue)

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

                #getElementsByTagName返回的是一个集合

                #childNodes返回的也是一个集合

f =  open('new.xml',  'w', encoding = 'utf-8')

dom.writexml(f,encoding = 'utf-8')

f.close()

<?xml version="1.0" encoding="utf-8"?>

<Schools>

    <School Name="XiDian">

        <Class Id="030612">

            <Student Name="salomon">

                <Scores>

                    <Math>98</Math>

                    <English>

                        <ll>85</ll>

                    </English>

                    <physics>89</physics>

                </Scores>

            </Student>

            <Student Name="Jupiter">

                <Scores>

                    <Math>74</Math>

                    <English>

                        <ll>83</ll>

                    </English>

                    <physics>69</physics>

                </Scores>

            </Student>

        </Class>

        <Class Id="030611">

            <Student Name="Venus">

                <Scores>

                    <Math>98</Math>

                    <English>

                         <ll>83</ll>

                    </English>

                    <physics>89</physics>

                </Scores>

            </Student>

            <Student Name="Mars">

                <Scores>

                    <Math>74</Math>

                    <English>

                         <ll>83</ll>

                    </English>

                    <physics>69</physics>

                </Scores>

            </Student>

        </Class>

    </School>

</Schools>