Python实现XML文件解析的示例代码

<?xml version="1.0" encoding="utf-8"?><catalog>  <maxid>4</maxid>  <login username="pytest" passwd='123456'>    <caption>Python</caption>    <item id="4">      <caption>测试</caption>    </item>  </login>  <item id="2">    <caption>Zope</caption>  </item></catalog>

#coding=utf-8#通过minidom解析xml文件import xml.dom.minidom as xmldomimport os''' XML文件读取 <?xml version="1.0" encoding="utf-8"?><catalog>  <maxid>4</maxid>  <login username="pytest" passwd='123456'>dasdas    <caption>Python</caption>    <item id="4">      <caption>测试</caption>    </item>  </login>  <item id="2">    <caption>Zope</caption>  </item></catalog>'''xmlfilepath = os.path.abspath("test.xml")print ("xml文件路径：", xmlfilepath)# 得到文档对象domobj = xmldom.parse(xmlfilepath)print("xmldom.parse:", type(domobj))# 得到元素对象elementobj = domobj.documentElementprint ("domobj.documentElement:", type(elementobj))#获得子标签subElementObj = elementobj.getElementsByTagName("login")print ("getElementsByTagName:", type(subElementObj))print (len(subElementObj))# 获得标签属性值print (subElementObj[0].getAttribute("username"))print (subElementObj[0].getAttribute("passwd"))#区分相同标签名的标签subElementObj1 = elementobj.getElementsByTagName("caption")for i in range(len(subElementObj1)):  print ("subElementObj1[i]:", type(subElementObj1[i]))  print (subElementObj1[i].firstChild.data) #显示标签对之间的数据

#coding=utf-8#通过解析xml文件'''try:  import xml.etree.CElementTree as ETexcept:  import xml.etree.ElementTree as ET从Python3.3开始ElementTree模块会自动寻找可用的C库来加快速度  '''import xml.etree.ElementTree as ETimport osimport sys''' XML文件读取 <?xml version="1.0" encoding="utf-8"?><catalog>  <maxid>4</maxid>  <login username="pytest" passwd='123456'>dasdas    <caption>Python</caption>    <item id="4">      <caption>测试</caption>    </item>  </login>  <item id="2">    <caption>Zope</caption>  </item></catalog>'''#遍历xml文件def traverseXml(element):  #print (len(element))  if len(element)>0:    for child in element:      print (child.tag, "----", child.attrib)      traverseXml(child)  #else:    #print (element.tag, "----", element.attrib)    if __name__ == "__main__":  xmlFilePath = os.path.abspath("test.xml")  print(xmlFilePath)  try:    tree = ET.parse(xmlFilePath)    print ("tree type:", type(tree))      # 获得根节点    root = tree.getroot()  except Exception as e: #捕获除与程序退出sys.exit()相关之外的所有异常    print ("parse test.xml fail!")    sys.exit()  print ("root type:", type(root))    print (root.tag, "----", root.attrib)    #遍历root的下一层  for child in root:    print ("遍历root的下一层", child.tag, "----", child.attrib)  #使用下标访问  print (root[0].text)  print (root[1][1][0].text)  print (20 * "*")  #遍历xml文件  traverseXml(root)  print (20 * "*")  #根据标签名查找root下的所有标签  captionList = root.findall("item") #在当前指定目录下遍历  print (len(captionList))  for caption in captionList:    print (caption.tag, "----", caption.attrib, "----", caption.text)  #修改xml文件，将passwd修改为999999  login = root.find("login")  passwdValue = login.get("passwd")  print ("not modify passwd:", passwdValue)  login.set("passwd", "999999")  #修改，若修改text则表示为login.text  print ("modify passwd:", login.get("passwd"))

#coding=utf-8'''  XML解析类  @功能-结点的增删改查'''import xml.etree.ElementTree as ETimport sysimport os.pathclass XmlParse:  def __init__(self, file_path):    self.tree = None    self.root = None    self.xml_file_path = file_path  def ReadXml(self):    try:      print("xmlfile:", self.xml_file_path)      self.tree = ET.parse(self.xml_file_path)      self.root = self.tree.getroot()    except Exception as e:      print ("parse xml faild!")      sys.exit()    else:      print ("parse xml success!")          finally:       return self.tree          def CreateNode(self, tag, attrib, text):    element = ET.Element(tag, attrib)    element.text = text    print ("tag:%s;attrib:%s;text:%s" %(tag, attrib, text))    return element         def AddNode(self, Parent, tag, attrib, text):    element = self.CreateNode(tag, attrib, text)    if Parent:      Parent.append(element)      el = self.root.find("lizhi")      print (el.tag, "----", el.attrib, "----", el.text)    else:      print ("parent is none")  def WriteXml(self, destfile):    dest_xml_file = os.path.abspath(destfile)    self.tree.write(dest_xml_file, encoding="utf-8",xml_declaration=True)    if __name__ == "__main__":  xml_file = os.path.abspath("test.xml")  parse = XmlParse(xml_file)  tree = parse.ReadXml()  root = tree.getroot()  print (root)  parse.AddNode(root, "Python", {"age":"22", "hello":"world"}, "YES")    parse.WriteXml("testtest.xml")