[Python-ideas] Re : Undelivered Mail Returned to Sender
chambon.pascal at wanadoo.fr
Tue Apr 28 22:45:56 CEST 2009
>Mathias Panzenböck a écrit :
>Pascal Chambon wrote:
>> I agree with the idea of auto-nesting "with", however in the case you
>> pointed out, the main problem was the early evaluation of context
>> managers ;
>> maybe a solution would be to delay the creation of context managers,
>> with something like a partial application (cf functools).
>> Roughly, we'd need a "delayedNested" function, which takes
>> callables as parameters, and calls/instanciates them inside itself.
>> Then just call* delayedNested(partial(A,...arguments...), partial(B,
>> ...arguments...))*/ /to have what you want.
>It would be much shorter and more readable to manually nest the with
Indeed, but the constructions we talk about would allow nesting dozens
of context managers without any problem ;
Well then, you'll ask me "what kind of a perverse would need to
imbricate dozens of context managers ???" ; sincerely I don't know ^^
But since "flat is better than nested", even just for 2 or 3 context
managers, I feel a construct like "with A() as a, B() as b, C() as c:"
is anyway better than 3 nested with statements
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