参考这个

xml的读取。

# -*- coding: utf-8 -*-
#新文件路径与旧文件路径
NewFilePath = r".\kcbpspd.xml"#新文件路径
OldFilePath = r".\xml\KCBPSPD.xml"#旧文件路径
 

from xml.dom.minidom import parse
#minidom解析器打开xml文档并将其解析为内存中的一棵树
DOMTree=parse(NewFilePath)
#获取xml文档对象，就是拿到树的根
collection=DOMTree.documentElement
 
DOMTree2=parse(OldFilePath)
 
collection2=DOMTree2.documentElement

print(collection)
if collection.hasAttribute('kcbpspd'):
       #判断根节点collection是否有shelf属性,有则获取并打印属性值
      print('Root element is ',collection.getAttribute('kcbpspd'))
      
#获取所有的movies节点
movies=collection.getElementsByTagName('program')
movies2=collection2.getElementsByTagName('program')
print(movies.length)
print(movies2.length)
#遍历集合
list1 = []
list2 = []
for movie in movies:
    #temp = []
    #temp.append(movie.getAttribute('name'))
    #temp.append(movie.getAttribute('module'))
    list1.append(movie.getAttribute('name'))
    if('290402' == movie.getAttribute('name')):
        print(len(list1))
for movie2 in movies2:
    #temp = []
    #temp.append(movie.getAttribute('name'))
    #temp.append(movie.getAttribute('module'))
    list2.append(movie2.getAttribute('name'))
    if('290402' == movie2.getAttribute('name')):
        print(len(list2))

print(set(list1).difference(set(list2)))