PRAW如何捕获“收到401 HTTP响应”

Question

我故意用错误的账号密码去尝试登录reddit的API，使用的是PRAW这个库。在我的控制台上，我看到出现了“收到401 HTTP响应”的错误。

Traceback (most recent call last):
  File "/Users/bob/Sites/django/myproj/lib/python3.8/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/Users/bob/Sites/django/myproj/lib/python3.8/site-packages/django/core/handlers/base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/Users/bob/Sites/django/myproj/lib/python3.8/site-packages/django/core/handlers/base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/Users/bob/Sites/django/myproj/src/blog/views.py", line 246, in syncMyPosts
    thisimage.remove_category = submission.removed_by_category
  File "/Users/bob/Sites/django/myproj/lib/python3.8/site-packages/praw/models/reddit/base.py", line 33, in __getattr__
    self._fetch()
  File "/Users/bob/Sites/django/myproj/lib/python3.8/site-packages/praw/models/reddit/submission.py", line 591, in _fetch
    data = self._fetch_data()
  File "/Users/bob/Sites/django/myproj/lib/python3.8/site-packages/praw/models/reddit/submission.py", line 588, in _fetch_data
    return self._reddit.request("GET", path, params)
  File "/Users/bob/Sites/django/myproj/lib/python3.8/site-packages/praw/reddit.py", line 726, in request
    return self._core.request(
  File "/Users/bob/Sites/django/myproj/lib/python3.8/site-packages/prawcore/sessions.py", line 329, in request
    return self._request_with_retries(
  File "/Users/bob/Sites/django/myproj/lib/python3.8/site-packages/prawcore/sessions.py", line 227, in _request_with_retries
    response, saved_exception = self._make_request(
  File "/Users/bob/Sites/django/myproj/lib/python3.8/site-packages/prawcore/sessions.py", line 185, in _make_request
    response = self._rate_limiter.call(
  File "/Users/bob/Sites/django/myproj/lib/python3.8/site-packages/prawcore/rate_limit.py", line 35, in call
    kwargs["headers"] = set_header_callback()
  File "/Users/bob/Sites/django/myproj/lib/python3.8/site-packages/prawcore/sessions.py", line 282, in _set_header_callback
    self._authorizer.refresh()
  File "/Users/bob/Sites/django/myproj/lib/python3.8/site-packages/prawcore/auth.py", line 349, in refresh
    self._request_token(
  File "/Users/bob/Sites/django/myproj/lib/python3.8/site-packages/prawcore/auth.py", line 149, in _request_token
    response = self._authenticator._post(url, **data)
  File "/Users/bob/Sites/django/myproj/lib/python3.8/site-packages/prawcore/auth.py", line 32, in _post
    raise ResponseException(response)
prawcore.exceptions.ResponseException: received 401 HTTP response

我想要捕捉这个错误/异常，并显示一个友好的提示信息。但我对如何使用try catch来处理这个异常有点困惑。

我对python和Django还很陌生。

提前谢谢你们！

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Answer 1

这里有一个简单的示例，展示了如何使用Python的try和except来实现你想要的功能。我们引入了ResponseException，因为我们想要捕捉这个异常。

import praw
from prawcore.exceptions import ResponseException

reddit = praw.Reddit(
    username="wrong_username",
    password="wrong password",
    client_id="bad client ID",
    client_secret="bad secret",
    user_agent="failing authentication",
)

try:
    print("Authenticated as {}".format(reddit.user.me()))
except ResponseException:
    print("Something went wrong during authentication")

我们把可能会出错的代码（在这个例子中是reddit.user.me()）放在try和except的块里面，这样当出现错误时，我们就可以指定其他的处理方式。