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Re: Is StopIteration a singleton?

References <mailman.16002.1416448354.18130.python-list@python.org> <546d77a5$0$12899$c3e8da3$5496439d@news.astraweb.com> <m4mc7n$mka$1@ger.gmane.org>
Date 2014-11-21 15:23 +1100
Subject Re: Is StopIteration a singleton?
From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.16081.1416543834.18130.python-list@python.org> (permalink)

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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.

ChrisA

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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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