说明
1、DOM会将整个XML读入内存，解析为树，所以占用内存大，解析慢。它的优点是可以随意遍历树的节点。
2、SAX是一种流模式，边读边分析，占用内存小，分析快，缺点是需要自己处理事件。一般情况下，SAX优先考虑，因为DOM占用内存太多。
实例
from xml.parsers.expat import ParserCreate
class DefaultSaxHandler(object):
def start_element(self, name, attrs):
print('sax:start_element: %s, attrs: %s' % (name, str(attrs)))
def end_element(self, name):
print('sax:end_element: %s' % name)
def char_data(self, text):
print('sax:char_data: %s' % text)
xml = r'''<?xml version="1.0"?>
<ol>
<li><a href="/python">Python</a></li>
<li><a href="/ruby">Ruby</a></li>
</ol>
'''
handler = DefaultSaxHandler()
parser = ParserCreate()
parser.StartElementHandler = handler.start_element
parser.EndElementHandler = handler.end_element
parser.CharacterDataHandler = handler.char_data
parser.Parse(xml)
//测试结果
sax:start_element: ol, attrs: {}
sax:char_data:
sax:char_data:
sax:start_element: li, attrs: {}
sax:start_element: a, attrs: {'href': '/python'}
sax:char_data: Python
sax:end_element: a
sax:end_element: li
sax:char_data:
sax:char_data:
sax:start_element: li, attrs: {}
sax:start_element: a, attrs: {'href': '/ruby'}
sax:char_data: Ruby
sax:end_element: a
sax:end_element: li
sax:char_data:
sax:end_element: ol以上就是python操作xml的两种方法，希望对大家有所帮助。更多Python学习指路：python基础教程
