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comp.lang.python

Re: How to make an empty generator?

Steve Holden

2/19/2010 3:52:00 AM

Stephen Hansen wrote:
> On Thu, Feb 18, 2010 at 2:56 PM, Robert Kern <robert.kern@gmail.com
> <mailto:robert.kern@gmail.com>> wrote:
>
> class once(object):
> def __init__(self, func, *args, **kwds):
> self.func = func
> self.args = args
> self.kwds = kwds
>
> def __iter__(self):
> return self
>
> def next(self):
> self.func(*self.args, **self.kwds)
> raise StopIteration()
>
>
> Hmm, yeah. I'd probably tweak it into a decorator and name it
> sideeffect_only or something, but yeah, that's the right approach at least.
>
> My motivation is clarity, I can just see a colleague a year from now
> asking me, "... what the hell is return / yield?" and although this is
> more expensive, its less clear to me.
>
> Thanks.
> --S
>
So add a comment to the yield statement so it reads

yield # force empty generator

I realise that Jacob Kaplan-Moss calls comments in the code "lies", but
the reader really only needs a small clue.

regards
Steve
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