----- Mensaje original ----
> De: "[email protected]" <[email protected]>
> Para: Gerald Britton <[email protected]>
> CC: [email protected]
> Enviado: martes, 20 de enero, 2009 11:18:24
> Asunto: Re: [Python-Dev] PEP 3142: Add a "while" clause to generator
> expressions
>
> 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.
>
This works as a generator, but not as a list comprehension. The exception is
propagated instead of just cutting short the loop:
>>> def r(): raise StopIteration
>>> print [i for i in range(10) if i**2 < 50 or r()]
Traceback (most recent call last):
File "<pyshell#2>", line 1, in <module>
print [i for i in range(10) if i**2 < 50 or r()]
File "<pyshell#1>", line 1, in r
def r(): raise StopIteration
StopIteration
>>>
Vitor
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