处理异常的两种写法

 1 from urllib.request import Request, urlopen
 2 from urllib.error import URLError, HTTPError
 3 req = Request(someurl)
 4 try:
 5     response = urlopen(req)
 6 except HTTPError as e:
 7     print(‘The server couldn\‘t fulfill the request.‘)
 8     print(‘Error code: ‘, e.code)
 9 except URLError as e:
10     print(‘We failed to reach a server.‘)
11     print(‘Reason: ‘, e.reason)
12 else:
13 # everything is fine

 1 from urllib.request import Request, urlopen
 2 from urllib.error import URLError
 3 req = Request(someurl)
 4 try:
 5     response = urlopen(req)
 6 except URLError as e:
 7     if hasattr(e, ‘reason‘):
 8         print(‘We failed to reach a server.‘)
 9         print(‘Reason: ‘, e.reason)
10     elif hasattr(e, ‘code‘):
11         print(‘The server couldn\‘t fulfill the request.‘)
12         print(‘Error code: ‘, e.code)
13 else:
14 # everything is fine