for loop - python中的错误/异常处理
for loop - python中的错误/异常处理
提问于 2018-07-06 04:32:43
我正在使用Google Cloud NL API来分析一些描述的情绪。对于错误InvalidArgument: 400 The language vi is not supported for document_sentiment analysis.不断弹出的一些行，我想构建一种绕过它的方法，而不是拼命地寻找发生这种情况的原因，并删除负责的行。不幸的是，我对Python比较陌生，不确定如何正确地使用它。
我的代码如下：
description_list = []
sentimentscore_list=[]
magnitude_list=[]
# Create a Language client
language_client = google.cloud.language.LanguageServiceClient()
for i in range(len(description)): # use the translated description if the original description is not in English
if description_trans[i] == '':
descr = description[i]
else:
descr = description_trans[i]
document = google.cloud.language.types.Document(
content=descr,
type=google.cloud.language.enums.Document.Type.PLAIN_TEXT)
# Use Language to detect the sentiment of the text.
response = language_client.analyze_sentiment(document=document)
sentiment = response.document_sentiment
sentimentscore_list.append(sentiment.score)
magnitude_list.append(sentiment.magnitude)
# Add the description that was actually used to the description list
description_list.append(descr)谁能解释一下如何将这个for循环(或者可能后面的部分就足够了)封装到错误/异常处理中，这样它就可以简单地“跳过”它无法读取的循环，并继续下一个循环？另外，我希望'description_list‘只在描述被实际分析的时候被附加(所以当它被错误处理卡住的时候就不会了)。
任何帮助都非常感谢！谢谢:)
编辑:我被要求提供更完整的错误回溯：
回溯(最近一次调用)：
File "<ipython-input-64-6e3db1d976c9>", line 1, in <module>
runfile('/Users/repos/NLPAnalysis/GoogleTest.py', wdir='/Users/repos/NLPAnalysis')
File "/Users/anaconda3/lib/python3.6/site-packages/spyder/utils/site/sitecustomize.py", line 710, in runfile
execfile(filename, namespace)
File "/Users/anaconda3/lib/python3.6/site-packages/spyder/utils/site/sitecustomize.py", line 101, in execfile
exec(compile(f.read(), filename, 'exec'), namespace)
File "/Users/repos/NLPAnalysis/GoogleTest.py", line 45, in <module>
response = language_client.analyze_sentiment(document=document)
File "/Users/anaconda3/lib/python3.6/site-packages/google/cloud/language_v1/gapic/language_service_client.py", line 180, in analyze_sentiment
return self._analyze_sentiment(request, retry=retry, timeout=timeout)
File "/Users/anaconda3/lib/python3.6/site-packages/google/api_core/gapic_v1/method.py", line 139, in __call__
return wrapped_func(*args, **kwargs)
File "/Users/anaconda3/lib/python3.6/site-packages/google/api_core/retry.py", line 260, in retry_wrapped_func
on_error=on_error,
File "/Users/anaconda3/lib/python3.6/site-packages/google/api_core/retry.py", line 177, in retry_target
return target()
File "/Users/anaconda3/lib/python3.6/site-packages/google/api_core/timeout.py", line 206, in func_with_timeout
return func(*args, **kwargs)
File "/Users/anaconda3/lib/python3.6/site-packages/google/api_core/grpc_helpers.py", line 56, in error_remapped_callable
six.raise_from(exceptions.from_grpc_error(exc), exc)
File "<string>", line 3, in raise_from
InvalidArgument: 400 The language vi is not supported for document_sentiment analysis.回答 2
Stack Overflow用户
回答已采纳
发布于 2018-07-06 06:43:59
我同意ThatBird的观点，在try块中包装太多代码会使调试内部错误变得复杂。我建议使用python的continue关键字。
try:
# smallest block of code you foresee an error in
response = language_client.analyze_sentiment(document=document) # I think your exception is being raised in this call
except InvalidArgument as e:
# your trace shows InvalidArgument being raised and it appears you dont care about it
continue # continue to next iteration since this error is expected
except SomeOtherOkayException as e:
# this is an example exception that is also OK and "skippable"
continue # continue to next iteration
except Exception as e:
# all other exceptions are BAD and unexpected.This is a larger problem than just this loop
raise e # break the looping and raise to calling function
sentiment = response.document_sentiment
sentimentscore_list.append(sentiment.score)
magnitude_list.append(sentiment.magnitude)
# Add the description that was actually used to the description list
description_list.append(descr)
# more code here...本质上，您是在显式地捕获预期的异常，并在它们发生时丢弃该迭代并继续到下一次迭代。您应该引发所有其他非预期的异常。
Stack Overflow用户
发布于 2018-07-06 04:52:06
在回溯中，看看第四行，它与您的代码中导致异常的代码行相同。我们总是将try放在我们认为会导致异常的代码块周围。其他的都放在区块之外。
try:
response = language_client.analyze_sentiment(document=document)
except InvalidArgument:
continue
# Assuming none of these would work if we don't get response?
description_list.append(descr)
sentiment = response.document_sentiment
entimentscore_list.append(sentiment.score)
magnitude_list.append(sentiment.magnitude)
# Add the description that was actually used to the description list我们尝试捕获来自语言客户端的响应，它会引发一个异常，声明InvalidArgument，。现在我们知道我们不需要做任何事情，我们使用continue，然后继续下一次迭代。
您可能需要像这样导入InvalidArgument -
from google.api_core.exceptions import InvalidArgument
在代码中使用它之前。
你对continue的看法是对的。更多关于continue statement和how to handle exceptions in python的信息。
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原文链接：
https://stackoverflow.com/questions/51199436
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