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[Python-Dev] Handle errors in cleanup code

Nathaniel Smith njs at pobox.com
Mon Jun 12 20:26:07 EDT 2017 
On Mon, Jun 12, 2017 at 6:29 AM, Stefan Ring <stefanrin at gmail.com> wrote:
>
> > Yury in the comment for PR 2108 [1] suggested more complicated code:
> >
> >     do_something()
> >     try:
> >         do_something_other()
> >     except BaseException as ex:
> >         try:
> >             undo_something()
> >         finally:
> >             raise ex
>
> And this is still bad, because it loses the back trace. The way we do it is:
>
>     do_something()
>     try:
>         do_something_other()
>     except BaseException as ex:
>         tb = sys.exc_info()[2]
>         try:
>             undo_something()
>         finally:
>             raise ex, None, tb

Are you testing on python 2? On Python 3 just plain 'raise ex' seems
to give a sensible traceback for me...

-n

-- 
Nathaniel J. Smith -- https://vorpus.org
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