spir a écrit :
Le Mon, 27 Apr 2009 20:54:58 +0100, Arnaud Delobelle <arnodel@googlemail.com> s'exprima ainsi:
with A(), B() as a,b: # Code that uses a and b.
This would translate directly to:
with A() as a: with B() as b: # Code that uses a and b.
There was a discussion about this on this list:
http://mail.python.org/pipermail/python-ideas/2009-March/003188.html
I can't remember the outcome.
There was no clear outcome, for sure ;-)
Except maybe it was stated that with A(), B() as a,b: should rather be spelled with A() as a, B() as b: to reuse the syntax of imports.
Denis
------ la vita e estrany _______________________________________________ Python-ideas mailing list Python-ideas@python.org http://mail.python.org/mailman/listinfo/python-ideas
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 zero-argument callables as parameters, and calls/instanciates them inside itself. Then just call* delayedNested(partial(A,...arguments...), partial(B, ...arguments...))*/ /to have what you want. Yes I know, it's not pretty (mainly because of the lack of partial application syntax in python), but it's just a placeholder ^^ Regards, Pascal