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Sentinels type annotations #105

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mlenzen opened this issue Aug 15, 2019 · 1 comment
Open

Sentinels type annotations #105

mlenzen opened this issue Aug 15, 2019 · 1 comment
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enhancement
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2.1

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@mlenzen
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mlenzen commented Aug 15, 2019 •
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Sentinels are also instances of themselves, so you can use the Sentinel as a type decorator. For example:

NOT_SET = Sentinel('not_set')
def f(arg: Union[int, None, NOT_SET] = NOT_SET):
	pass

https://stackoverflow.com/questions/10936125/python-an-object-can-be-its-own-type
@mlenzen mlenzen changed the title Sentinels are also instances of themselves Sentinels type annotations Feb 4, 2022
@mlenzen
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mlenzen commented Feb 4, 2022

This is blocking #41

Work is being done in core Python that may obviate this issue.

@mlenzen mlenzen added this to the 2.1 milestone Feb 4, 2022
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