# PEP 661: Sentinel Values

**URL:** <https://discuss.python.org/t/pep-661-sentinel-values/9126>\
**Category:** PEPs\
**Created:** [June 6, 2021, 8:07am UTC](https://discuss.python.org/t/pep-661-sentinel-values/9126 "2021-06-06T08:07:06Z")\
**Posts on this page:** 1\
**Showing post:** 44

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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:** [September 29, 2021, 8:18pm UTC](https://discuss.python.org/t/pep-661-sentinel-values/9126/44 "2021-09-29T20:18:22Z")

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After a great delay, I’ve decided to go with using `Literal[NotGiven]` for type annotations of sentinel values.

Thanks for everyone taking part in the discussion of type annotations for sentinels, here and [on the typing-sig mailing list](https://mail.python.org/archives/list/typing-sig@python.org/thread/NDEJ7UCDPINP634GXWDARVMTGDVSNBKV/#LVCPTY26JQJW7NKGKGAZXHQKWVW7GOGL)!

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