Python HTTP Exception Handling

问题

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:

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.")

回答1:

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):

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

except Exception:

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

except Exception as x:
    print(x)

来源：https://stackoverflow.com/questions/18544510/python-http-exception-handling

标签

python

exception-handling