Pascal Chambon wrote:

...

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

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.

It would be much shorter and more readable to manually nest the with statements.

-panzi

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

Yes I'm +1 for "with A() as a, B() as b, C() as c:", too. For the deleyedNested(...) thing I'm -1 however.