[Python-Dev] list comprehensions again...

[Greg Stein]

On Tue, Jul 11, 2000 at 07:02:06PM -0400, Barry A. Warsaw wrote:
> 
> >>>>> "TW" == Thomas Wouters <thomas@xs4all.net> writes:
> 
>     TW> I agree that all this together looks dodgy, but I think there
>     TW> is a simple way to view it... I still think
> 
>     TW> 'for x in a; y in b:'
> 
>     TW> is the right syntax for parallel for loops. It's almost "only"
>     TW> syntactic sugar for
> 
>     TW> 'for x,y in map(None, a, b)'
> 
> But wouldn't some variation on
> 
>     for x, y in a, b:
> 
> invoke resonance with the classic idiom?  Okay, now I'm reduced to
> arguing syntax (and syntax which I haven't thought out much :).

for x, y in a, b:

won't work. "a, b" is a tuple constructor. The for-loop will iterate over a
two-item tuple, and unpack each item (a and b) into the x,y variables.

Try again or punt :-)

Cheers,
-g

-- 
Greg Stein, http://www.lyra.org/