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[stubtest] ignore __conditional_annotations__#20392

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JelleZijlstra merged 1 commit intopython:masterfrom
jorenham:stubtest/__conditional_annotations__
Dec 10, 2025
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[stubtest] ignore __conditional_annotations__#20392
JelleZijlstra merged 1 commit intopython:masterfrom
jorenham:stubtest/__conditional_annotations__

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@jorenham
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@jorenham jorenham commented Dec 10, 2025

On Python 3.14, this module attribute seems to exist in certain situations:

>>> if True:
...     a: str
...     
>>> __conditional_annotations__
{0}

It's a pretty esoteric attribute without any documentation. It seems to have been added in python/cpython#130935

Either way, stubtest was complaining about it in scipy-stubs. So all things considered, I figured it'd be best to just ignore it.

@JelleZijlstra JelleZijlstra merged commit dabcce9 into python:master Dec 10, 2025
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@jorenham jorenham deleted the stubtest/__conditional_annotations__ branch December 10, 2025 14:28
@github-project-automation github-project-automation bot moved this from Todo to Done in GC-Content-Calculator Dec 12, 2025
@jungerm2
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jungerm2 commented Jan 15, 2026

I'm getting a module.__conditional_annotations__ is not present in stub error, when using mypy 1.19.1 in python 3.14.0. That mypy version was released just a few days after this fix was merged in, does it not contain it? Is there a temporary fix in the meantime I could use?

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jorenham commented Jan 15, 2026 •
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1.19.1 indeed doesn't this: https://github.com/python/mypy/commits/v1.19.1/

Is there a temporary fix in the meantime I could use?

You could annotate it, or put it in an allowlist.

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jungerm2 commented Jan 15, 2026

Any workaround until the next release?

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jorenham commented Jan 16, 2026

Like I said, you could annotate it, or put it in an allowlist.
Here's what I did in scipy-stubs: https://github.com/scipy/scipy-stubs/blob/423767dd63020d29de36ed63278d3ed1f03d47ab/scipy-stubs/special/_add_newdocs.pyi#L5-L7

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@jorenham @jungerm2 @JelleZijlstra