Open Stack

Another idea,

Django has the following: http://bit.ly/1n1cuWm

It seems like a useful similar function we can have to do the correct
thing for exceptions and other objects.

Or maybe we should talk with the django folks to see why they have a
useful method like that.

-Josh

-----Original Message-----
From: Victor Stinner <victor.stinner at enovance.com>
Organization: eNovance
Reply-To: "OpenStack Development Mailing List (not for usage questions)"
<openstack-dev at lists.openstack.org>
Date: Friday, May 16, 2014 at 7:04 AM
To: "OpenStack Development Mailing List (not for usage questions)"
<openstack-dev at lists.openstack.org>
Subject: Re: [openstack-dev] [oslo] Logging exceptions and Python 3

>Le vendredi 16 mai 2014, 06:03:53 Johannes Erdfelt a écrit :
>> On Fri, May 16, 2014, Igor Kalnitsky <ikalnitsky at mirantis.com> wrote:
>> > > According to http://legacy.python.org/dev/peps/pep-0352/ the message
>> > > attribute of BaseException is deprecated since Python 2.6 and was
>> > > dropped in Python 3.0.
>> > 
>> > Some projects have custom exception hierarchy, with strictly defined
>> > attributes (e.g. message, or something else). In a previous mail, I
>> > mean exactly that case, not the case with a built-in exceptions.
>> 
>> That's a fragile assumption to make.
>> 
>> unicode(exc) (or six.text_type(exc)) works for all exceptions, built-in
>> or custom. I don't see the reason why it's being avoided.
>
>See my documentation:
>https://wiki.openstack.org/wiki/Python3#logging_module_and_format_exceptio
>ns
>
>" six.text_type(exc): always use Unicode. It may raise unicode error
>depending 
>on the exception, be careful. Example of such error in python 2:
>unicode(Exception("nonascii:\xe9")). "
>
>unicode(exc) works with such exception classes:
>---
>class MyException1(Exception):
>    pass
>
>exc = MyException1()
>exc.message = u"\u20ac"
>unicode(exc) #ok
>
>class MyException2(Exception):
>    def __unicode__(self):
>        return u"\20ac"
>
>exc = MyException2()
>unicode(exc) #ok
>---
>
>If we want to format an exception as Unicode, we need a function trying
>unicode(), or use str() and then guess the encoding. It means adding a
>new 
>safe function to Olso to format an exception.
>
>Victor
>
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