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gh-144851: Fix __lazy_import__ crash with user-defined filters (#144852)

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Bartosz Sławecki 2026-03-02 12:01:32 +01:00 • committed by GitHub
parent 3b276f3f59
commit 8bcb3eaa67
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5
Lib/test/test_lazy_import/__init__.py
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@ -391,6 +391,11 @@ def test_dunder_lazy_import(self):
import test.test_lazy_import.data.dunder_lazy_import
self.assertNotIn("test.test_lazy_import.data.basic2", sys.modules)
def test_dunder_lazy_import_with_custom_filter(self):
sys.set_lazy_imports_filter(lambda importer, imported, fromlist: False)
import test.test_lazy_import.data.dunder_lazy_import
self.assertIn("test.test_lazy_import.data.basic2", sys.modules)
def test_dunder_lazy_import_used(self):
"""Using __lazy_import__ result should trigger module load."""
import test.test_lazy_import.data.dunder_lazy_import_used

4
Python/import.c
View file

@ -4512,6 +4512,10 @@ _PyImport_LazyImportModuleLevelObject(PyThreadState *tstate,
assert(!PyErr_Occurred());
modname = Py_NewRef(Py_None);
}
if (fromlist == NULL) {
assert(!PyErr_Occurred());
fromlist = Py_NewRef(Py_None);
}
PyObject *args[] = {modname, name, fromlist};
PyObject *res = PyObject_Vectorcall(filter, args, 3, NULL);