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List:       python-dev
Subject:    Re: [Python-Dev] PEP 344: Exception Chaining and Embedded Tracebacks
From:       Eric Nieuwland <eric.nieuwland () xs4all ! nl>
Date:       2005-05-17 17:49:55
Message-ID: 94cc3abfd1b8fd2a83e6fa84b9452508 () xs4all ! nl
[Download RAW message or body]

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

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