python练习报错‘No module named parsers.expat’

在练习廖雪峰python教程时，碰到这样一段代码：

from xml.parsers.expat import ParserCreateclass 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.returns_unicode = True
parser.StartElementHandler = handler.start_element
parser.EndElementHandler = handler.end_element
parser.CharacterDataHandler = handler.char_data
parser.Parse(xml)

报如下错误：

from xml.parsers.expat import ParserCreate

ImportError: No module named parsers.expat

import sys
sys.path.append("/usr/lib/python2.7/xml/parsers/")from expat import ParserCreate

问题解决！

究其原因：

没有找打相应的模块(

from xml.parsers.expat import ParserCreate