[Python-Dev] Proposed changes to PEP 343

[Anders J. Munch]

Nick Coghlan did a +1 job to write:
> 1. Amend the statement specification such that:
> 
>        with EXPR as VAR:
>            BLOCK
> 
> is translated as:
> 
>        abc = (EXPR).__with__()
>        exc = (None, None, None)
>        VAR = abc.__enter__()
>        try:
>            try:
>                BLOCK
>            except:
>                exc = sys.exc_info()
>                raise
>        finally:
>            abc.__exit__(*exc)

Note that __with__ and __enter__ could be combined into one with no
loss of functionality:

        abc,VAR = (EXPR).__with__()
        exc = (None, None, None)
        try:
            try:
                BLOCK
           except:
                exc = sys.exc_info()
                raise
        finally:
            abc.__exit__(*exc)
 
- Anders