python检查URL是否正常访问

import urllib.request 
import time 
 
opener = urllib.request.build_opener() 
opener.addheaders = [('User-agent', 'Mozilla/49.0.2')] 
#这个是你放网址的文件名，改过来就可以了 
file = open('test.txt') 
lines = file.readlines() 
aa=[] 
for line in lines: 
 temp=line.replace('
','') 
 aa.append(temp) 
print(aa) 
 
print('开始检查：') 
for a in aa: 
 tempUrl = a 
 try : 
 opener.open(tempUrl) 
 print(tempUrl+'没问题') 
 except urllib.error.HTTPError: 
 print(tempUrl+'=访问页面出错') 
 time.sleep(2) 
 except urllib.error.URLError: 
 print(tempUrl+'=访问页面出错') 
 time.sleep(2) 
 time.sleep(0.1)