python - Exception shows up in wrong place -


in t.cursor() method, exception twython library thrown small percentage of ids. however, whenever exception occurs, actual line in code it's thrown for-loop comes after try/except block, prevents continue being called.

how exception can thrown in try block, not caught except block, , show later during (mostly) unrelated code?

and yes, it's 401 error, that's twitter api returning wrong code. in reality i'm correctly authenticating. know can move except block after for-loop, want know how can happen @ all.

from twython import twython t = twython(...)  # ...  id in ids:     try:         # exception caused following line         followers = t.cursor(t.get_followers_ids, id=id)     except:         # block never run         print("exception user " + str(id))         continue      # line throws exception, inexplicably     follower_id in followers:         values.append((follower_id, id, scrape_datetime))      # ...

the traceback:

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     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 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 401 (unauthorized), error occurred processing request.

looks t.cursor(...) returns generator doesn't execute until iterate through it. while might appear connection happens at:

followers = t.cursor(t.get_followers_ids, id=id)

it doesn't until iterate through generator loop. sort of mentioned here

if have need defer processing until later still want catch exception, turn generator list. exhaust generator , save data later.

followers = t.cursor(t.get_followers_ids, id=id) followers = list(followers)

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