Re: Is StopIteration a singleton?

From	Terry Reedy <tjreedy@udel.edu>
Subject	Re: Is StopIteration a singleton?
Date	2014-11-20 23:54 -0500
References	<mailman.16002.1416448354.18130.python-list@python.org> <546d77a5$0$12899$c3e8da3$5496439d@news.astraweb.com> <m4mc7n$mka$1@ger.gmane.org> <CAPTjJmofghCkhNQd2DFtNe-3HVABteKDN-4DxoT716xHXnEM4Q@mail.gmail.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.16083.1416545723.18130.python-list@python.org> (permalink)

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On 11/20/2014 11:23 PM, Chris Angelico wrote:
> On Fri, Nov 21, 2014 at 2:40 PM, Terry Reedy <tjreedy@udel.edu> wrote:
>> On 11/20/2014 12:09 AM, Steven D'Aprano wrote:
>>
>>> No idea. But you can marshal StopIteration itself, but not StopIteration
>>> instances:
>>>
>>> py> marshal.dumps(StopIteration)
>>> 'S'
>>> py> marshal.dumps(StopIteration())
>>> Traceback (most recent call last):
>>>     File "<stdin>", line 1, in <module>
>>> ValueError: unmarshallable object
>>
>>
>> Ditto for other exception classes I tried.
>
> I can't marshal any other exception instances, but I also can't
> marshal any other exception classes. StopIteration is special-cased,
> and I have no idea why.

Sorry I was unclear.  I meant ditto ValueError for all other classes.


-- 
Terry Jan Reedy

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Thread

Is StopIteration a singleton? Chris Angelico <rosuav@gmail.com> - 2014-11-20 12:52 +1100
  Re: Is StopIteration a singleton? Steven D'Aprano <steve@pearwood.info> - 2014-11-20 05:09 +0000
    Re: Is StopIteration a singleton? Chris Angelico <rosuav@gmail.com> - 2014-11-20 16:16 +1100
    Re: Is StopIteration a singleton? Terry Reedy <tjreedy@udel.edu> - 2014-11-20 22:40 -0500
    Re: Is StopIteration a singleton? Chris Angelico <rosuav@gmail.com> - 2014-11-21 15:23 +1100
    Re: Is StopIteration a singleton? Terry Reedy <tjreedy@udel.edu> - 2014-11-20 23:54 -0500

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