如何在 Python 中捕获特定的 HTTP 错误？

是的

import urllib2
try:
urllib2.urlopen("some url")
except urllib2.HTTPError:
<whatever>

but what I end up is catching any kind of HTTP error. I want to catch only if the specified webpage doesn't exist (404?).

152715 次浏览

小开

最佳答案

Python 3

from urllib.error import HTTPError

Python 2

from urllib2 import HTTPError

Just catch HTTPError, handle it, and if it's not Error 404, simply use raise to re-raise the exception.

See the Python tutorial.

Here is a complete example for Python 2:

import urllib2
from urllib2 import HTTPError
try:
urllib2.urlopen("some url")
except HTTPError as err:
if err.code == 404:
<whatever>
else:
raise

小开

For Python 3.x

import urllib.request
import urllib.error
try:
urllib.request.urlretrieve(url, fullpath)
except urllib.error.HTTPError as err:
print(err.code)

小开

Tim's answer seems to me as misleading especially when urllib2 does not return the expected code. For example, this error will be fatal (believe or not - it is not uncommon one when downloading urls):

AttributeError: 'URLError' object has no attribute 'code'

Fast, but maybe not the best solution would be code using nested try/except block:

import urllib2
try:
urllib2.urlopen("some url")
except urllib2.HTTPError as err:
try:
if err.code == 404:
# Handle the error
else:
raise
except:
...

More information to the topic of nested try/except blocks Are nested try/except blocks in python a good programming practice?