python - 如何在 Python 中处理异常?
问题描述
我正在使用 Imdbpy 库从 IMDB 获取电影列表的详细信息。但是我无法处理生成的异常。
我哪里错了?
这是代码:
from imdb import IMDb
ia = IMDb()
from_id = 650
to_id = from_id +5
for i in range(from_id,to_id):
try:
movie_id = ia.get_movie(i)
title = movie_id['title']
release_year = movie_id['year']
kind = movie_id['kind']
movieid = movie_id.movieID
print ("here", title,kind,movieid)
except:
pass
当出现异常时,我不想做任何事情。我希望它跳过它。我什至试过except Exception as e
。但这并没有帮助。它仍然抛出错误。
这是错误:
2019-03-21 15:00:24,230 CRITICAL [imdbpy] C:\Python36x64\lib\site-packages\imdb\_exceptions.py:34: IMDbDataAccessError exception raised; args: ({'errcode': None, 'errmsg': 'None', 'url': 'http://www.imdb.com/title/tt0000652/reference', 'proxy': '', 'exception type': 'IOError', 'original exception': <HTTPError 404: 'Not Found'>},); kwds: {}
Traceback (most recent call last):
File "C:\Python36x64\lib\site-packages\imdb\parser\http\__init__.py", line 231, in retrieve_unicode
response = uopener.open(url)
File "C:\Python36x64\lib\urllib\request.py", line 532, in open
response = meth(req, response)
File "C:\Python36x64\lib\urllib\request.py", line 642, in http_response
'http', request, response, code, msg, hdrs)
File "C:\Python36x64\lib\urllib\request.py", line 564, in error
result = self._call_chain(*args)
File "C:\Python36x64\lib\urllib\request.py", line 504, in _call_chain
result = func(*args)
File "C:\Python36x64\lib\urllib\request.py", line 756, in http_error_302
return self.parent.open(new, timeout=req.timeout)
File "C:\Python36x64\lib\urllib\request.py", line 532, in open
response = meth(req, response)
File "C:\Python36x64\lib\urllib\request.py", line 642, in http_response
'http', request, response, code, msg, hdrs)
File "C:\Python36x64\lib\urllib\request.py", line 570, in error
return self._call_chain(*args)
File "C:\Python36x64\lib\urllib\request.py", line 504, in _call_chain
result = func(*args)
File "C:\Python36x64\lib\urllib\request.py", line 650, in http_error_default
raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 404: Not Found
2019-03-21 15:00:24,237 CRITICAL [imdbpy] C:\Python36x64\lib\site-packages\imdb\__init__.py:714: caught an exception retrieving or parsing "main" info set for mopID "0000652" (accessSystem: http)
Traceback (most recent call last):
File "C:\Python36x64\lib\site-packages\imdb\parser\http\__init__.py", line 231, in retrieve_unicode
response = uopener.open(url)
File "C:\Python36x64\lib\urllib\request.py", line 532, in open
response = meth(req, response)
File "C:\Python36x64\lib\urllib\request.py", line 642, in http_response
'http', request, response, code, msg, hdrs)
File "C:\Python36x64\lib\urllib\request.py", line 564, in error
result = self._call_chain(*args)
File "C:\Python36x64\lib\urllib\request.py", line 504, in _call_chain
result = func(*args)
File "C:\Python36x64\lib\urllib\request.py", line 756, in http_error_302
return self.parent.open(new, timeout=req.timeout)
File "C:\Python36x64\lib\urllib\request.py", line 532, in open
response = meth(req, response)
File "C:\Python36x64\lib\urllib\request.py", line 642, in http_response
'http', request, response, code, msg, hdrs)
File "C:\Python36x64\lib\urllib\request.py", line 570, in error
return self._call_chain(*args)
File "C:\Python36x64\lib\urllib\request.py", line 504, in _call_chain
result = func(*args)
File "C:\Python36x64\lib\urllib\request.py", line 650, in http_error_default
raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 404: Not Found
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Python36x64\lib\site-packages\imdb\__init__.py", line 709, in update
ret = method(mopID)
File "C:\Python36x64\lib\site-packages\imdb\parser\http\__init__.py", line 446, in get_movie_main
cont = self._retrieve(self.urls['movie_main'] % movieID + 'reference')
File "C:\Python36x64\lib\site-packages\imdb\parser\http\__init__.py", line 406, in _retrieve
ret = self.urlOpener.retrieve_unicode(url, size=size)
File "C:\Python36x64\lib\site-packages\imdb\parser\http\__init__.py", line 265, in retrieve_unicode
'original exception': e}
imdb._exceptions.IMDbDataAccessError: {'errcode': None, 'errmsg': 'None', 'url': 'http://www.imdb.com/title/tt0000652/reference', 'proxy': '', 'exception type': 'IOError', 'original exception': <HTTPError 404: 'Not Found'>}
2019-03-21 15:00:25,253 CRITICAL [imdbpy] C:\Python36x64\lib\site-packages\imdb\_exceptions.py:34: IMDbDataAccessError exception raised; args: ({'errcode': None, 'errmsg': 'None', 'url': 'http://www.imdb.com/title/tt0000652/plotsummary', 'proxy': '', 'exception type': 'IOError', 'original exception': <HTTPError 404: 'Not Found'>},); kwds: {}
Traceback (most recent call last):
File "C:\Python36x64\lib\site-packages\imdb\parser\http\__init__.py", line 231, in retrieve_unicode
response = uopener.open(url)
File "C:\Python36x64\lib\urllib\request.py", line 532, in open
response = meth(req, response)
File "C:\Python36x64\lib\urllib\request.py", line 642, in http_response
'http', request, response, code, msg, hdrs)
File "C:\Python36x64\lib\urllib\request.py", line 564, in error
result = self._call_chain(*args)
File "C:\Python36x64\lib\urllib\request.py", line 504, in _call_chain
result = func(*args)
File "C:\Python36x64\lib\urllib\request.py", line 756, in http_error_302
return self.parent.open(new, timeout=req.timeout)
File "C:\Python36x64\lib\urllib\request.py", line 532, in open
response = meth(req, response)
File "C:\Python36x64\lib\urllib\request.py", line 642, in http_response
'http', request, response, code, msg, hdrs)
File "C:\Python36x64\lib\urllib\request.py", line 570, in error
return self._call_chain(*args)
File "C:\Python36x64\lib\urllib\request.py", line 504, in _call_chain
result = func(*args)
File "C:\Python36x64\lib\urllib\request.py", line 650, in http_error_default
raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 404: Not Found
2019-03-21 15:00:25,254 CRITICAL [imdbpy] C:\Python36x64\lib\site-packages\imdb\__init__.py:714: caught an exception retrieving or parsing "plot" info set for mopID "0000652" (accessSystem: http)
Traceback (most recent call last):
File "C:\Python36x64\lib\site-packages\imdb\parser\http\__init__.py", line 231, in retrieve_unicode
response = uopener.open(url)
File "C:\Python36x64\lib\urllib\request.py", line 532, in open
response = meth(req, response)
File "C:\Python36x64\lib\urllib\request.py", line 642, in http_response
'http', request, response, code, msg, hdrs)
File "C:\Python36x64\lib\urllib\request.py", line 564, in error
result = self._call_chain(*args)
File "C:\Python36x64\lib\urllib\request.py", line 504, in _call_chain
result = func(*args)
File "C:\Python36x64\lib\urllib\request.py", line 756, in http_error_302
return self.parent.open(new, timeout=req.timeout)
File "C:\Python36x64\lib\urllib\request.py", line 532, in open
response = meth(req, response)
File "C:\Python36x64\lib\urllib\request.py", line 642, in http_response
'http', request, response, code, msg, hdrs)
File "C:\Python36x64\lib\urllib\request.py", line 570, in error
return self._call_chain(*args)
File "C:\Python36x64\lib\urllib\request.py", line 504, in _call_chain
result = func(*args)
File "C:\Python36x64\lib\urllib\request.py", line 650, in http_error_default
raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 404: Not Found
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Python36x64\lib\site-packages\imdb\__init__.py", line 709, in update
ret = method(mopID)
File "C:\Python36x64\lib\site-packages\imdb\parser\http\__init__.py", line 454, in get_movie_plot
cont = self._retrieve(self.urls['movie_main'] % movieID + 'plotsummary')
File "C:\Python36x64\lib\site-packages\imdb\parser\http\__init__.py", line 406, in _retrieve
ret = self.urlOpener.retrieve_unicode(url, size=size)
File "C:\Python36x64\lib\site-packages\imdb\parser\http\__init__.py", line 265, in retrieve_unicode
'original exception': e}
imdb._exceptions.IMDbDataAccessError: {'errcode': None, 'errmsg': 'None', 'url': 'http://www.imdb.com/title/tt0000652/plotsummary', 'proxy': '', 'exception type': 'IOError', 'original exception': <HTTPError 404: 'Not Found'>}
我收到id = 652的错误。
解决方案
实际上你正在处理异常,你只是决定处理它而不做任何事情。
由于异常处理,您的代码继续执行,并且在错误中也有正确的行:
here The Boston Tea Party movie 0000650
here The Boy Detective, or The Abductors Foiled movie 0000651
here A Calamitous Elopement movie 0000653
here The Call of the Wild movie 0000654
如果您删除 try-catch,您的代码将在第一个错误时停止执行。
我认为打印错误是因为 imdbpy 中的某些命令打印在标准错误上。如果您想避免它们,您可以将标准错误重定向到/dev/null
文件或文件,例如通过以这种方式启动脚本:
python3 my_imdb.py 2> /dev/null
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