`BadDependencyError` when assigning an inherited classmethod to a variable

[Avasam]

See https://github.com/python/typeshed/pull/12991/files#diff-75dfb84f0ad6ea28f6880f12c95f276b475cd3f908f0efaaee59217a16de05a3L57-R60
Permalink: https://github.com/Avasam/typeshed/blob/063be1660a9589c1c07fb6e96af275c822d42789/stubs/setuptools/setuptools/__init__.pyi#L58-L59

Replacing

from .discovery import _Finder
find_packages = _Finder.find
find_namespace_packages = _Finder.find

With

from .discovery import PackageFinder, PEP420PackageFinder
find_packages = PackageFinder.find
find_namespace_packages = PEP420PackageFinder.find

Where those classes are defined as:

class _Finder:
    ALWAYS_EXCLUDE: ClassVar[tuple[str, ...]]
    DEFAULT_EXCLUDE: ClassVar[tuple[str, ...]]
    @classmethod
    def find(cls, where: StrPath = ".", exclude: Iterable[str] = (), include: Iterable[str] = ("*",)) -> list[str]: ...

class PackageFinder(_Finder):
    ALWAYS_EXCLUDE: ClassVar[tuple[str, ...]]

class PEP420PackageFinder(PackageFinder): ...

Causes the following errors https://github.com/python/typeshed/actions/runs/11769652125/job/32780972631?pr=12991#step:8:1937

stubs/fanstatic/fanstatic/__init__.pyi (3.12): pytype.load_pytd.BadDependencyError: No PEP420PackageFinder.find in module setuptools.discovery, referenced from 'setuptools'

stubs/fanstatic/fanstatic/compiler.pyi (3.12): pytype.load_pytd.BadDependencyError: No PEP420PackageFinder.find in module setuptools.discovery, referenced from 'setuptools'

stubs/fanstatic/fanstatic/publisher.pyi (3.12): pytype.load_pytd.BadDependencyError: No PEP420PackageFinder.find in module setuptools.discovery, referenced from 'setuptools'

stubs/fanstatic/fanstatic/registry.pyi (3.12): pytype.load_pytd.BadDependencyError: No PEP420PackageFinder.find in module setuptools.discovery, referenced from 'setuptools'

stubs/fanstatic/fanstatic/wsgi.pyi (3.12): pytype.load_pytd.BadDependencyError: No PEP420PackageFinder.find in module setuptools.discovery, referenced from 'setuptools'

stubs/libsass/sassutils/distutils.pyi (3.12): pytype.load_pytd.BadDependencyError: No PEP420PackageFinder.find in module setuptools.discovery, referenced from 'setuptools'

stubs/setuptools/setuptools/__init__.pyi (3.12): pytype.load_pytd.BadDependencyError: No PEP420PackageFinder.find in module setuptools.discovery, referenced from 'setuptools'

stubs/setuptools/setuptools/build_meta.pyi (3.12): pytype.load_pytd.BadDependencyError: No PEP420PackageFinder.find in module setuptools.discovery, referenced from 'setuptools'

stubs/setuptools/setuptools/command/easy_install.pyi (3.12): pytype.load_pytd.BadDependencyError: Unknown module setuptools, referenced from 'setuptools.command.easy_install'

stubs/setuptools/setuptools/command/editable_wheel.pyi (3.12): pytype.load_pytd.BadDependencyError: Unknown module setuptools, referenced from 'setuptools.command.editable_wheel'

stubs/setuptools/setuptools/command/egg_info.pyi (3.12): pytype.load_pytd.BadDependencyError: Unknown module setuptools, referenced from 'setuptools.command.egg_info'

stubs/setuptools/setuptools/command/test.pyi (3.12): pytype.load_pytd.BadDependencyError: No PEP420PackageFinder.find in module setuptools.discovery, referenced from 'setuptools'

stubs/setuptools/setuptools/discovery.pyi (3.12): pytype.load_pytd.BadDependencyError: Unknown module setuptools, referenced from 'setuptools.dist'

stubs/setuptools/setuptools/dist.pyi (3.12): pytype.load_pytd.BadDependencyError: Unknown module setuptools, referenced from 'setuptools.dist'

[h-joo]

Hi, thank you for your report. Google is shifting its effort to a different approach for type checking apart from pytype, and we're not planning to put in any effort in the near future in pytype, so we'll close this issue. Please see the announcement here.