Daily tests failed on Fri Jun 07 2024

[github-actions]

Runs listed here: https://github.com/python/typeshed/actions/workflows/daily.yml

[srittau]

error: jsonschema._format.is_css21_color is not present at runtime
Stub: in file /home/runner/work/typeshed/typeshed/stubs/jsonschema/jsonschema/_format.pyi:43
def (instance: builtins.object) -> builtins.bool
Runtime:
MISSING

error: jsonschema._format.is_css_color_code is not present at runtime
Stub: in file /home/runner/work/typeshed/typeshed/stubs/jsonschema/jsonschema/_format.pyi:42
def (instance: builtins.object) -> builtins.bool
Runtime:
MISSING

[AlexWaygood]

It looks like the functions in question exist if ImportError is not raised in this block here, but do not exist if ImportError is raised in the block: https://github.com/python-jsonschema/jsonschema/blob/0024b584c6b6f332f0f5fa5452488901b73328f9/jsonschema/_format.py#L415-L429

The block has two import statements in it: it tries to import webcolors, and it tries to import a specific constant from webcolors. webcolors cut a new release on June 6: https://pypi.org/project/webcolors/. The new release gets rid of one of the constants that the block is trying to import, so now ImportError is always raised in that block at runtime, meaning that the relevant functions in jsonschema are never defined.

[AlexWaygood]

I think the proper course of action here is:

1. Pin webcolors to an older version in our CI to fix stubtest
2. File an issue at jsonschema to let them know that this block now always raises ImportError.

I don't think we should change our stubs until jsonschema and webcolors have sorted this out between themselves.

[AlexWaygood]

I opened python-jsonschema/jsonschema#1268, so I think we've done all we need to on this now.