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gh-95754: Better AttributeError on partially initialised module #112577

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Merged
hauntsaninja merged 7 commits into from
Dec 21, 2023
Merged

gh-95754: Better AttributeError on partially initialised module #112577

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3e339ae
gh-95754: Better AttributeError on partially initialised module
hauntsaninja Dec 1, 2023
7222653
📜🤖 Added by blurb_it.
blurb-it[bot] Dec 1, 2023
a1c7198
code review
hauntsaninja Dec 1, 2023
3bac475
return null
hauntsaninja Dec 4, 2023
7ffb4a9
Merge remote-tracking branch 'upstream/main' into gh95754
hauntsaninja Dec 18, 2023
e043b30
rebase changes
hauntsaninja Dec 18, 2023
5e27a8f
Update Objects/moduleobject.c
serhiy-storchaka Dec 18, 2023
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gh-95754: Better AttributeError on partially initialised module
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@hauntsaninja
hauntsaninja committed Dec 1, 2023
commit 3e339aed2bc84e97b038aa07b1a2bdf5e06c5cc3
8 changes: 8 additions & 0 deletions Lib/test/test_import/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1629,6 +1629,14 @@ def test_circular_from_import(self):
str(cm.exception),
)

def test_circular_import(self):
with self.assertRaisesRegex(
AttributeError,
r"partially initialized module 'test.test_import.data.circular_imports.import_cycle' "
r"from '.*' has no attribute 'some_attribute' \(most likely due to a circular import\)"
):
import test.test_import.data.circular_imports.import_cycle

def test_absolute_circular_submodule(self):
with self.assertRaises(AttributeError) as cm:
import test.test_import.data.circular_imports.subpkg2.parent
Expand Down
3 changes: 3 additions & 0 deletions Lib/test/test_import/data/circular_imports/import_cycle.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
import test.test_import.data.circular_imports.import_cycle as m

m.some_attribute
15 changes: 13 additions & 2 deletions Objects/moduleobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -799,7 +799,7 @@ PyObject*
_Py_module_getattro_impl(PyModuleObject *m, PyObject *name, int suppress)
{
// When suppress=1, this function suppresses AttributeError.
PyObject *attr, *mod_name, *getattr;
PyObject *attr, *mod_name, *getattr, *origin;
attr = _PyObject_GenericGetAttrWithDict((PyObject *)m, name, NULL, suppress);
if (attr) {
return attr;
Expand Down Expand Up @@ -841,11 +841,22 @@ _Py_module_getattro_impl(PyModuleObject *m, PyObject *name, int suppress)
}
if (suppress != 1) {
if (_PyModuleSpec_IsInitializing(spec)) {
PyErr_Format(PyExc_AttributeError,
origin = PyObject_GetAttr(spec, &_Py_ID(origin));
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@serhiy-storchaka serhiy-storchaka Dec 1, 2023

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PyObject_GetAttr() can set not only AttributeError. If it sets a different error, it should not be overridden by AttributeError.

I suggest to use PyObject_GetOptionalAttr().

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@iritkatriel iritkatriel Dec 1, 2023

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Why not chain the original error to a new exception (raise from)?

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@iritkatriel iritkatriel Dec 1, 2023

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Or maybe this is a use case for adding a note to the original exception and letting it propagate on (if we don't want to change the type of the exception being raised).

if (origin == NULL || origin == Py_None) {
PyErr_Format(PyExc_AttributeError,
"partially initialized "
"module '%U' has no attribute '%U' "
"(most likely due to a circular import)",
mod_name, name);
}
else {
PyErr_Format(PyExc_AttributeError,
"partially initialized "
"module '%U' from '%U' has no attribute '%U' "
"(most likely due to a circular import)",
mod_name, origin, name);
}
Py_XDECREF(origin);
}
else if (_PyModuleSpec_IsUninitializedSubmodule(spec, name)) {
PyErr_Format(PyExc_AttributeError,
Expand Down