try... except with unknown error types

Mel mwilson at the-wire.com
Fri Aug 19 23:22:42 CEST 2011


xDog Walker wrote:
> On Friday 2011 August 19 12:09, Yingjie Lin wrote:
[ ... ]
>> Does anyone know what error type I should put after the except statement?
>> or even better: is there a way not to specify the error types? Thank you.
> 
> You probably need to import urllib2 before you can use urllib2.HTTPError.
> 
> Otherwise, you can try using the base class:
> 
>     except Exception, e:

There are maybe better base classes to use.  Running the interpreter:
Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56) 
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import urllib2
>>> help (urllib2.HTTPError)

will show you

class HTTPError(URLError, urllib.addinfourl)
 |  Raised when HTTP error occurs, but also acts like non-error return
 |  
 |  Method resolution order:
 |      HTTPError
 |      URLError
 |      exceptions.IOError
 |      exceptions.EnvironmentError
 |      exceptions.StandardError
 |      exceptions.Exception
 |      exceptions.BaseException
> 

So catching any of urllib2.HTTPError, urllib2.URLError, IOError, 
EnvironmentError, or StandardError will detect the exception -- with 
increasing levels of generality.

	Mel.




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