# Sentinel values in the stdlib

**URL:** <https://discuss.python.org/t/sentinel-values-in-the-stdlib/8810>\
**Category:** Core Development\
**Created:** [May 20, 2021, 9:59am UTC](https://discuss.python.org/t/sentinel-values-in-the-stdlib/8810 "2021-05-20T09:59:17Z")\
**Posts on this page:** 1\
**Showing post:** 28

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**Author:** ![taleinat](https://sea2.discourse-cdn.com/flex002/user_avatar/discuss.python.org/taleinat/32/92_2.png) [@taleinat](https://discuss.python.org/u/taleinat)\
**Post date:** [June 6, 2021, 8:47am UTC](https://discuss.python.org/t/sentinel-values-in-the-stdlib/8810/28 "2021-06-06T08:47:28Z")

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This is now PEP 661: Sentinel Values.

> **[PEP 661 – Sentinel Values | peps.python.org](https://peps.python.org/pep-0661/)**
>
> Python Enhancement Proposals (PEPs)

Further discussion should be conducted here:

> [@PEP 661: Sentinel Values](https://discuss.python.org/t/pep-661-sentinel-values/9126):
>

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