[Python-Dev] PEP 3142: Add a "while" clause to generator expressions

[Gerald Britton]

hmmm...doesn't:

    if n*n < 50 or raise StopIteration()

really mean, "Return an integer in the range 0-99 if n-squared is less
than fifty or the statement 'raise StopIteration()' returns True" ?

I'm not sure that that will work.

On Tue, Jan 20, 2009 at 9:18 AM,  <python-3000 at udmvt.ru> wrote:
> On Mon, Jan 19, 2009 at 10:10:00AM -0500, Gerald Britton wrote:
>> Please find below PEP 3142: Add a "while" clause to generator
>> expressions.  I'm looking for feedback and discussion.
>>
> ...
>>       g = (n for n in range(100) while n*n < 50)
>
> May I suggest you this variant?
>
>        def raiseStopIteration():
>                raise StopIteration
>
>        g = (n for n in range(100) if n*n < 50 or raiseStopIteration())
>
> Well, there are more characters...
>
> But it is not using any syntax changes and does not require any approval
> to be functional. Yet it is as fast as the proposed variant, does not require
> modules and, I hope, will not confuse you or anyone else.
>
>
> --
> Alexey G. Shpagin
>