在t.cursor()方法中,会为一小部分id抛出来自Twython库的异常。然而,无论何时发生异常,代码中抛出异常的实际行都是try/except块之后的for循环,这会阻止
continue
避免被呼叫。
异常是如何在try块中抛出的,而不是被except块捕获的,然后在稍后的一些(大部分)不相关的代码中出现的?
是的,这是一个401错误,但这只是推特API返回了错误的代码。事实上,我的身份验证是正确的。我也知道我可以把except块移到for循环之后,但我只想知道这是怎么发生的。
from twython import Twython
t = Twython(...)
# ...
for id in ids:
try:
# exception is truly caused by the following line
followers = t.cursor(t.get_followers_ids, id=id)
except:
# this block is never run
print("Exception with user " + str(id))
continue
# this line actually throws the exception, inexplicably
for follower_id in followers:
values.append((follower_id, id, scrape_datetime))
# ...
回溯:
Traceback (most recent call last):
File "/root/twitter/nightly.py", line 5, in <module>
t.get_followers(t.current_tweeters)
File "/root/twitter/tweets.py", line 81, in get_followers
for follower_id in followers:
File "/usr/local/lib/python3.3/dist-packages/twython-3.0.0-py3.3.egg/twython/api.py", line 398, in cursor
content = function(**params)
File "/usr/local/lib/python3.3/dist-packages/twython-3.0.0-py3.3.egg/twython/endpoints.py", line 212, in get_followers_ids
return self.get('followers/ids', params=params)
File "/usr/local/lib/python3.3/dist-packages/twython-3.0.0-py3.3.egg/twython/api.py", line 231, in get
return self.request(endpoint, params=params, version=version)
File "/usr/local/lib/python3.3/dist-packages/twython-3.0.0-py3.3.egg/twython/api.py", line 225, in request
content = self._request(url, method=method, params=params, api_call=url)
File "/usr/local/lib/python3.3/dist-packages/twython-3.0.0-py3.3.egg/twython/api.py", line 195, in _request
retry_after=response.headers.get('retry-after'))
twython.exceptions.TwythonAuthError: Twitter API returned a 401 (Unauthorized), An error occurred processing your request.
