c85fce39b regressed importing standard library modules that are "masked"

[s-t-e-v-e-n-k]

• [x] a detailed description of the bug or problem you are having
• [x] output of pip list from the virtual environment you are using
• [x] pytest and operating system versions
• [x] minimal example if possible

As reported in this jaraco.test issue comment, this commit broke the ability to import test.support, which is in the standard library, while testing jaraco.test.

pip list:

abuild@conjecture:/home/abuild> pip list
Package            Version
------------------ -----------------------
annotated-types    0.6.0
attrs              23.2.0
autocommand        2.2.2
backports.tarfile  1.0.0
inflect            7.0.0
iniconfig          2.0.0
jaraco.classes     3.4.0
jaraco.collections 5.0.1
jaraco.context     5.3.0
jaraco.functools   4.0.0
jaraco.text        3.12.0
more-itertools     10.2.0
packaging          24.0
pip                24.0
pluggy             1.5.0
pydantic           2.7.1
pydantic_core      2.18.2
pytest             8.1.0.dev253+gc85fce39b
setuptools         69.0.3
setuptools-scm     8.0.4
toml               0.10.2
typing_extensions  4.11.0
wheel              0.43.0

Operating system: openSUSE Tumbleweed

The minimal example would be running jaraco.test's testsuite under pytest, I guess.

[hroncok]

This is one of the reasons we are reluctant to update pytest from 7 to 8 in Fedora Linux, but I am out of my league here. Could somebody please investigate? I can buy you a beverage at EuroPython if it helps :)

[s-t-e-v-e-n-k]

Turns out this doesn't just mask standard library modules, but any modules that are named the same:

From jaraco.packaging's testsuite:

[   19s] __________________ [doctest] packaging.metadata.hunt_down_url __________________
[   19s] 019
[   19s] 020     Given project metadata, figure out what the package URL is.
[   19s] 021
[   19s] 022     >>> hunt_down_url(load('.'))
[   19s] UNEXPECTED EXCEPTION: ModuleNotFoundError("No module named 'packaging.version'")
[   19s] Traceback (most recent call last):
[   19s]   File "/usr/lib64/python3.10/doctest.py", line 1350, in __run
[   19s]     exec(compile(example.source, filename, "single",
[   19s]   File "<doctest packaging.metadata.hunt_down_url[0]>", line 1, in <module>
[   19s]   File "/home/abuild/rpmbuild/BUILD/jaraco_packaging-10.2.2/jaraco/packaging/metadata.py", line 15, in load
[   19s]     return util.project_wheel_metadata(source_dir, isolated, **kwargs)
[   19s]   File "/usr/lib/python3.10/site-packages/build/util.py", line 42, in project_wheel_metadata
[   19s]     with DefaultIsolatedEnv() as env:
[   19s]   File "/usr/lib/python3.10/site-packages/build/env.py", line 90, in __enter__
[   19s]     self._env_backend = _PipBackend()
[   19s]   File "/usr/lib/python3.10/site-packages/build/env.py", line 153, in __init__
[   19s]     self._create_with_virtualenv = not self._has_valid_outer_pip and self._has_virtualenv
[   19s]   File "/usr/lib64/python3.10/functools.py", line 981, in __get__
[   19s]     val = self.func(instance)
[   19s]   File "/usr/lib/python3.10/site-packages/build/env.py", line 162, in _has_valid_outer_pip
[   19s]     return _has_dependency('pip', '22.3')
[   19s]   File "/usr/lib/python3.10/site-packages/build/env.py", line 46, in _has_dependency
[   19s]     from packaging.version import Version
[   19s] ModuleNotFoundError: No module named 'packaging.version'

Python 3.10.14 (main, Mar 21 2024, 16:45:28) [GCC] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import packaging.version
>>> packaging.version.__file__
'/usr/lib/python3.10/site-packages/packaging/version.py'

This first bit me with 8.2.0 and continues to do so.