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gh-117178: Recover lazy loading of self-referential modules (#117179)

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Chris Markiewicz 2024-03-28 06:59:31 -04:00 • committed by GitHub
parent 4c71d51a4b
commit 9a1e55b8c5
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3 changed files with 25 additions and 6 deletions
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18
Lib/test/test_importlib/test_lazy.py
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@ -178,6 +178,24 @@ def access_module():
# Or multiple load attempts
self.assertEqual(loader.load_count, 1)
def test_lazy_self_referential_modules(self):
# Directory modules with submodules that reference the parent can attempt to access
# the parent module during a load. Verify that this common pattern works with lazy loading.
# json is a good example in the stdlib.
json_modules = [name for name in sys.modules if name.startswith('json')]
with test_util.uncache(*json_modules):
# Standard lazy loading, unwrapped
spec = util.find_spec('json')
loader = util.LazyLoader(spec.loader)
spec.loader = loader
module = util.module_from_spec(spec)
sys.modules['json'] = module
loader.exec_module(module)
# Trigger load with attribute lookup, ensure expected behavior
test_load = module.loads('{}')
self.assertEqual(test_load, {})
if __name__ == '__main__':
unittest.main()