Am 07.07.2005 um 20:00 schrieb Guido van Rossum:
>>> +1 on @contextmanager
>
> +1.
>
> [__enter__, __exit__]
>
>>>> These names should be changed to __beginwith__ and __endwith__.
>>>>
>
> -1. The PEP has had an extensive review period and several
> alternatives were discussed and rejected. These names are clear, they
> *do* match, and as Fred says the __*__ namespace has lots of room.
>
> Also, the PEP was accepted with these names. Now, if it was accepted
> with a major flaw or some semantics left unspecified,
What is still unspecified (or at least not explicitely mentioned) in
the PEP is the lifetime of VAR in:
with EXPR as VAR:
BLOCK
Does VAR overwrite or shadow any previous values of VAR? I.e. will
VAR still exist after the end of the block with its value the return
value of __enter__() or will it revert to the previous value (if
any)? I'd prefer the later although interpreting the translation of
with EXPR as VAR:
BLOCK
into
abc = EXPR
exc = (None, None, None)
VAR = abc.__enter__()
try:
try:
BLOCK
except:
exc = sys.exc_info()
raise
finally:
abc.__exit__(*exc)
literally would indicate the former.
Bye,
Walter Dörwald
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