NotGiven and NOT_GIVEN for Python

pip install notgiven

Sentinel singleton to distinguish between omitted arguments and those explicitly set to None.

NOT_GIVEN is the only instance of NotGiven.
NotGiven cannot be instantiated or subclassed.
NOT_GIVEN is falsy (bool(NOT_GIVEN) is always False)
Pickling/unpickling, copying, and deepcopying NOT_GIVEN all result in the same value.
NOT_GIVEN has no slots, so attributes may not be set on it.
NOT_GIVEN's string representation is "NOT_GIVEN"
Thread-safe in all situations.

from notgiven import (
    NotGiven,
    NOT_GIVEN,
    is_given,
    is_not_given,
    is_given_guard,  # Only useful in 3.13+
    is_not_given_guard,  # Only useful in 3.13+
)

Metadata

Release files for notgiven 0.0.5

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Source distribution (sdist)

Source distribution for notgiven 0.0.5
File	Size	Uploaded
notgiven-0.0.5.tar.gz	2.8 kB	Aug 12, 2025	Details

Built distribution (wheel)

Table of built distributions (wheels) for notgiven 0.0.5
File	Interpreter	ABI	Platform	Reset
notgiven-0.0.5-py3-none-any.whl 3.7 kB Aug 12, 2025	Python 3	none	any	Details

Total release size: 6.4 kB

Release files / notgiven-0.0.5.tar.gz

Download URL	notgiven-0.0.5.tar.gz
Size	2.8 kB
Tags	Source
SHA-256 checksum How to use checksums	`1206e5c2357a87ddde05a006adde5bb3d3bc09d11d906bcd21fa3327cc6f3774`
BLAKE2b-256 checksum How to use checksums	`c87ba0427b6721aee7e936c4f5d2472382887fce8f520a313251f3e306109405`
Upload date	Aug 12, 2025
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/6.1.0 CPython/3.13.3`

Release files / notgiven-0.0.5-py3-none-any.whl

Download URL	notgiven-0.0.5-py3-none-any.whl
Size	3.7 kB
Tags	Python 3
SHA-256 checksum How to use checksums	`3d0fd55e25281966d175319e989d4e60dc3a31040be30ff9ca101e488bee410d`
BLAKE2b-256 checksum How to use checksums	`723e13fc35dc8c8a6e17eb8ba888aa9423447d06f9c106d222b4fd0713ffe5c8`
Upload date	Aug 12, 2025
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/6.1.0 CPython/3.13.3`