[Python-Dev] PEP 344: Exception Chaining and Embedded Tracebacks

[Guido van Rossum]

But that could easily be fixed by appending the context to the end of
the chain, right?

On 5/17/05, Eric Nieuwland <eric.nieuwland at xs4all.nl> wrote:
> Guido van Rossum wrote:
> > Consider
> >
> >     try:
> >         BLOCK
> >     except EXCEPTION, VAR:
> >         HANDLER
> >
> > I'd like to see this translated into
> >
> >     try:
> >         BLOCK
> >     except EXCEPTION, VAR:
> >         __context = VAR
> >         try:
> >             HANDLER
> >         except Exception, __error:
> >             __error.__context__ = __context
> >             raise
> 
> If I interpret the above translation correctly, then:
>      try:
>          BLOCK1
>      except EXCEPTION1, VAR1:
>          try:
>              BLOCK2
>          except EXCEPTION2, VAR2:
>              HANDLER
> 
> with exceptions occuring in BLOCK1, BLOCK2 and HANDLER would result in
> HANDLER's exception with __context__ set to BLOCK1's exception and
> BLOCK2's exception would be lost.
> 
> --eric
> 
> 


-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)