Python HTTP异常处理 [英] Python HTTP Exception Handling

问题描述

我正在运行一个从网站下载文件的程序。我引入了一个异常处理urllib.error.HTTPError，但是现在我不定期地收到我不确定如何捕获的其他错误：http.client.IncompleteRead。我只需将下面的代码添加到底部的代码中。

I'm running a program that downloads files from a web sit. I've introduced one exception handling urllib.error.HTTPError, but now I'm getting from time to time additional errors that I'm not sure how to capture: http.client.IncompleteRead. Do I just add the following to the code at the bottom?

except http.client.IncompleteRead:

我必须添加多少例外才能确保程序不会停止？而且我必须将它们全部添加在相同的除外语句或几个除外语句中。

How many exceptions do I have to add to make sure the program doesn't stop? And do I have to add them all in the same Except statement or in several Except statements.

try:
   # Open a file object for the webpage 
   f = urllib.request.urlopen(imageURL)
   # Open the local file where you will store the image
   imageF = open('{0}{1}{2}{3}'.format(dirImages, imageName, imageNumber, extension), 'wb')
   # Write the image to the local file
   imageF.write(f.read())
   # Clean up
   imageF.close()
   f.close()

except urllib.error.HTTPError: # The 'except' block executes if an HTTPError is thrown by the try block, then the program continues as usual.
   print ("Image fetch failed.")

推荐答案

p>如果要单独处理每个异常类型，您可以添加单独的，除了子句，也可以将它们全部放在一起：

You can add individual except clauses if you want to handle each exception type separately, or you could put them all in one:

except (urllib.error.HTTPError, http.client.IncompleteRead):

您还可以添加一个泛型子句，将捕获以前未处理的任何内容：

You can also add a generic clause that will catch anything not handled previously:

except Exception:

有关更多信息的消息，您可以打印发生的实际异常：

For more informative messages, you can print the actual exception that happens:

except Exception as x:
    print(x)

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