Python3基于sax解析xml操作示例

本文实例讲述了Python3基于sax解析xml操作。分享给大家供大家参考，具体如下：

python使用SAX解析xml

SAX是一种基于事件驱动的API。

利用SAX解析XML文档牵涉到两个部分:解析器和事件处理器。

解析器负责读取XML文档,并向事件处理器发送事件,如元素开始跟元素结束事件;

而事件处理器则负责对事件作出相应,对传递的XML数据进行处理。

1、对大型文件进行处理；
2、只需要文件的部分内容，或者只需从文件中得到特定信息。
3、想建立自己的对象模型的时候。

在python中使用sax方式处理xml要先引入xml.sax中的parse函数，还有xml.sax.handler中的ContentHandler。

saxDemo.py

# -*- coding:utf-8 -*-#!/usr/bin/python3import xml.saxclass MovieHandler( xml.sax.ContentHandler ):  def __init__(self):    self.CurrentData = ""    self.type = ""    self.format = ""    self.year = ""    self.rating = ""    self.stars = ""    self.description = ""  # 元素开始调用  def startElement(self, tag, attributes):    self.CurrentData = tag    if tag == "movie":      print ("*****Movie*****")      title = attributes["title"]      print ("Title:", title)  # 元素结束调用  def endElement(self, tag):    if self.CurrentData == "type":      print ("Type:", self.type)    elif self.CurrentData == "format":      print ("Format:", self.format)    elif self.CurrentData == "year":      print ("Year:", self.year)    elif self.CurrentData == "rating":      print ("Rating:", self.rating)    elif self.CurrentData == "stars":      print ("Stars:", self.stars)    elif self.CurrentData == "description":      print ("Description:", self.description)    self.CurrentData = ""  # 读取字符时调用  def characters(self, content):    if self.CurrentData == "type":      self.type = content    elif self.CurrentData == "format":      self.format = content    elif self.CurrentData == "year":      self.year = content    elif self.CurrentData == "rating":      self.rating = content    elif self.CurrentData == "stars":      self.stars = content    elif self.CurrentData == "description":      self.description = contentif ( __name__ == "__main__"):  # 创建一个 XMLReader  parser = xml.sax.make_parser()  # turn off namepsaces  parser.setFeature(xml.sax.handler.feature_namespaces, 0)  # 重写 ContextHandler  Handler = MovieHandler()  parser.setContentHandler( Handler )  parser.parse("movies.xml")

执行结果

*****Movie*****
Title: Enemy Behind
Type: love中国
Format: DVD
Year: 2003
Rating: PG
Stars: 10
Description: Talk about a US-Japan war
*****Movie*****
Title: Transformers
Type: Anime, Science Fiction
Format: DVD
Year: 1989
Rating: R
Stars: 8
Description: A schientific fiction