Module __getattr__ shadows a module's own lazy imports

[brittanyrey]

Bug report

Bug
Accessing a lazily imported module via attribute access triggers the module's __getattr__, instead of resolving the lazy import.

Minimal Repro

# pkg/__init__.py
lazy from ._version import __version__

def __getattr__(name):
    import importlib
    return importlib.import_module(f"{__name__}.{name}")

>>> import pkg
>>> pkg.__version__
ModuleNotFoundError: No module named 'pkg.__version__'

How this Happened
The check in _Py_module_getattro_impl() (Objects/moduleobject.c) was the fix for
gh-144957, when lazy from put placeholders into the source module. gh-150052 removed
those placeholders, so now we override the lazy import reification with the __getattr__ check.

CPython versions tested on:

3.15

Operating systems tested on:

Linux

Linked PRs

• gh-158824: Fix __getattr__ blocking reification of lazy imports #158825