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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <usenet@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Thu, 23 Jun 2011 01:30:13 +0200
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Subject: Re: writable iterators?
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Mel wrote:

> Steven D'Aprano wrote:
>> I *guess* that what you mean by "writable iterators" is that rebinding e
>> should change seq in place, i.e. you would expect that seq should now
>> equal [42, 42]. Is that what you mean? It's not clear.
>> 
>> Fortunately, that's not how it works, and far from being a "limitation",
>> it would be *disastrous* if iterables worked that way. I can't imagine
>> how many bugs would occur from people reassigning to the loop variable,
>> forgetting that it had a side-effect of also reassigning to the iterable.
>> Fortunately, Python is not that badly designed.
> 
> And for an iterator like
> 
> def things():
>     yield 1
>     yield 11
>     yield 4
>     yield 9
> 
> I don't know what it could even mean.

<http://docs.python.org/reference/simple_stmts.html#the-yield-statement>

You could have tried to debug.

Please trim your quotes to the relevant minimum.

-- 
PointedEars

Bitte keine Kopien per E-Mail. / Please do not Cc: me.