Le Friday 05 September 2008 08:30:44 Fredrik Lundh, vous avez écrit :
> Maric Michaud wrote:
> > You''ll often see for loops written like this :
> >
> > for i in (e for e in iterable if predicate(e)) :
> > ...
>
> luckily, I don't. most people, when faced with that problem, writes it
> in the obvious way:
>
> for i in iterable:
> if predicate(i):
> ...
So do I, most often, but this construct is common, I think because it makes
clear what the for loop is iterating over, also it comes naturally once used
to the more elaborated
for i in (expr(e) for e in iterable if predicate(e)) :
This one is truly a gain for readability IMO, compared to :
for i in iterable:
i = expr(i)
if predicate(i):
In the latter, the reader need more effort to figure out what finally "i" is
in the loop.
>
> to avoid an extra iterator and save typing.
>
and at the cost of an extra indentation level.
> </F>
>
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Maric Michaud
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