En Fri, 09 Mar 2007 23:58:59 -0300, Steven D'Aprano
<[EMAIL PROTECTED]> escribió:
> You know, now that Python has a warnings module, it would be really good
> if list-of-lists*int raised a warning. Does anyone know if that's
> feasible
> or possible? It needn't catch every imaginable Gotcha, just the common
> case. I'm thinking something like this:
>
> # pseudo-code
> class list:
> def __mul__(self, count):
> for item in self:
> if isinstance(item, list):
> warn("this duplicates references, not copies")
> break
> ...do the rest
But isn't the same with almost any other object (except inmutable ones)?
[{}]*5, [set()]*5, even [my_instance]*5?
It's hard to tell when it's a legitimate use and when it's a mistake, and
the checking+warning call has a cost...
--
Gabriel Genellina
--
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