1 #coding=utf-8 2 from urllib2 import urlopen 3 from bs4 import BeautifulSoup 4 import urllib2 5 url="http://pythonscraping.com/pages/page1.html" 6 def getTitle(url): 7     """ 8     说明一下，处理异常的过程 9     1.检查是否能打开网页 异常类型为urllib2.HTTPError10     2.检查是否服务器存在，不存在返回空，那么在read是返回AttributeError11     :param url:12     :return:13     """14     try:15 16         html=urlopen(url)17     except urllib2.HTTPError as e:18 #这里的错误是网页不存在19         print e20         return None21     try:22         bsobj=BeautifulSoup(html.read(),"html.parser")23         title=bsobj.body.h124     except AttributeError as e:25         return None26     return title27 title=getTitle(url)28 if title is None:29     print "Title could not be found"30 else:31     print title