1 #捕获异常
2 import urllib.request
3 import urllib.error
4
5 try:
6 response = urllib.request.urlopen('http://sasd.com')
7 except urllib.error.URLError as e:
8 print('挂掉的情形是：',e.reason)
1 import urllib.request
2 import urllib.error
3 try:
4 response = urllib.request.urlopen('http://www.asdddwf.com')
5 except urllib.error.HTTPError as e:
6 print(e.reason,e.code,e.headers,sep='\n')
7 except urllib.error.URLError as e:
8 print(e.reason)
9 else:
10 print('Requset Successfully')
11 #urllib.error的异常分类
12 #URlError，下面有个reason
13 #URLError的子类是HTTPError，下面有code,reason,headers
14 #捕捉异常要把子类开始捕捉，因为一旦捕捉第一个，后面的异常判断就不会继续执行了
1 #验证异常的具体原因
2 import socket
3 import urllib.request
4 import urllib.error
5
6 try:
7 response = urllib.request.urlopen('http://www.baidu.com',timeout=0.01)
8 except urllib.error.URLError as e:
9 print(e.reason)
10 if isinstance(e.reason,socket.timeout):
11 print('TIME OUT!')
