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gh-145452: Initialize PyLazyImport_Type during interpreter startup #145453

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Merged
vstinner merged 9 commits into from
Mar 3, 2026
Merged

gh-145452: Initialize PyLazyImport_Type during interpreter startup #145453

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51ddfe7
Add failing test
johnslavik Mar 3, 2026
f90762a
Initialize `PyLazyImport_Type` in `_PyTypes_InitTypes`
johnslavik Mar 3, 2026
37e6257
Add explanations to the test
johnslavik Mar 3, 2026
1579fb9
Fix issue number in test explanation
johnslavik Mar 3, 2026
e498ab5
Use a descriptive docstring for the test
johnslavik Mar 3, 2026
ec6ed07
Use big boy guns for the subprocess test
johnslavik Mar 3, 2026
ee2d160
Add extra space line
johnslavik Mar 3, 2026
6ea42c7
Fix linting issue
johnslavik Mar 3, 2026
9cbc664
One more problem
johnslavik Mar 3, 2026
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11 changes: 11 additions & 0 deletions Lib/test/test_lazy_import/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@
import os

from test import support
from test.support.script_helper import assert_python_ok

try:
import _testcapi
Expand Down Expand Up @@ -219,6 +220,16 @@ def test_lazy_import_type_cant_construct(self):
"""LazyImportType should not be directly constructible."""
self.assertRaises(TypeError, types.LazyImportType, {}, "module")

@support.requires_subprocess()
def test_lazy_import_type_attributes_accessible(self):
"""Check that static PyLazyImport_Type is initialized at startup."""
code = textwrap.dedent("""
lazy import json
print(globals()["json"].resolve)
""")
proc = assert_python_ok("-c", code)
self.assertIn(b"<built-in method resolve of lazy_import object at", proc.out)


class SyntaxRestrictionTests(unittest.TestCase):
"""Tests for syntax restrictions on lazy imports."""
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2 changes: 2 additions & 0 deletions Objects/object.c
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@
#include "pycore_instruction_sequence.h" // _PyInstructionSequence_Type
#include "pycore_interpframe.h" // _PyFrame_Stackbase()
#include "pycore_interpolation.h" // _PyInterpolation_Type
#include "pycore_lazyimportobject.h" // PyLazyImport_Type
#include "pycore_list.h" // _PyList_DebugMallocStats()
#include "pycore_long.h" // _PyLong_GetZero()
#include "pycore_memoryobject.h" // _PyManagedBuffer_Type
Expand Down Expand Up @@ -2540,6 +2541,7 @@ static PyTypeObject* static_types[] = {
&PyGen_Type,
&PyGetSetDescr_Type,
&PyInstanceMethod_Type,
&PyLazyImport_Type,
&PyListIter_Type,
&PyListRevIter_Type,
&PyList_Type,
Expand Down
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