Groups > comp.lang.python > #197780

Re: Coming In Python 3.15: Sentinel Values

From	Lawrence D’Oliveiro <ldo@nz.invalid>
Newsgroups	comp.lang.python
Subject	Re: Coming In Python 3.15: Sentinel Values
Date	2026-05-12 02:42 +0000
Organization	A noiseless patient Spider
Message-ID	<10tu41p$1jtti$5@dont-email.me> (permalink)
References	<10tr770$omms$1@dont-email.me> <95aadm-t721.ln1@oceanview.tundraware.com>

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On Mon, 11 May 2026 19:51:21 -0500, Tim Daneliuk wrote:

> On 5/10/26 19:17, Lawrence D’Oliveiro wrote:
>>
>> A new feature coming in Python 3.15 is the “sentinel” class, useful
>> for creating custom values to mark the end of sequences of items, that
>> kind of thing
>> <https://docs.python.org/3.15/library/functions.html#sentinel>,
>> <https://peps.python.org/pep-0661/>.
>>
>> For those times when a simple “None” marker element is not
>> sufficient, this will be very convenient.
>
> Forgive me, but this smells of Feeping Creaturism to solve a not
> very important question at the expense crufting up the language and
> decreasing clarity.

In order to be forgiven, you will have to explain why you think so.
Some of us have done enough Python programming that we can see the
utility of such a feature, minor as it is.

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Thread

Coming In Python 3.15: Sentinel Values Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-11 00:17 +0000
  Re: Coming In Python 3.15: Sentinel Values Paul Rubin <no.email@nospam.invalid> - 2026-05-10 21:01 -0700
    Re: Coming In Python 3.15: Sentinel Values Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-11 06:24 +0000
      Re: Coming In Python 3.15: Sentinel Values Jon Ribbens <jon+usenet@unequivocal.eu> - 2026-05-11 07:13 +0000
  Re: Coming In Python 3.15: Sentinel Values Tim Daneliuk <info@tundraware.com> - 2026-05-11 19:51 -0500
    Re: Coming In Python 3.15: Sentinel Values Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-12 02:42 +0000
      Re: Coming In Python 3.15: Sentinel Values Tim Daneliuk <info@tundraware.com> - 2026-05-12 09:52 -0500
    Re: Coming In Python 3.15: Sentinel Values Paul Rubin <no.email@nospam.invalid> - 2026-05-12 01:03 -0700
      Re: Coming In Python 3.15: Sentinel Values Tim Daneliuk <info@tundraware.com> - 2026-05-12 09:54 -0500

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