https://github.com/python/cpython/commit/5fe139cc39fb8110b3d6cbed6224d7c8f5d91987
commit: 5fe139cc39fb8110b3d6cbed6224d7c8f5d91987
branch: main
author: Pablo Galindo Salgado <[email protected]>
committer: pablogsal <[email protected]>
date: 2026-02-15T18:36:47Z
summary:
gh-144727: Add test for circular lazy import crash (#144727) (#144838)
Add a regression test ensuring that circular lazy imports raise a proper
error (ImportCycleError) instead of crashing with a segfault. The crash
was fixed in gh-144733 but no test was added at the time.
files:
M Lib/test/test_import/test_lazy_imports.py
diff --git a/Lib/test/test_import/test_lazy_imports.py
b/Lib/test/test_import/test_lazy_imports.py
index 1193af9589034b..a4c9c14ae2b5f8 100644
--- a/Lib/test/test_import/test_lazy_imports.py
+++ b/Lib/test/test_import/test_lazy_imports.py
@@ -8,6 +8,8 @@
import threading
import types
import unittest
+import tempfile
+import os
try:
import _testcapi
@@ -598,6 +600,39 @@ def test_error_during_module_execution_propagates(self):
self.assertEqual(result.returncode, 0, f"stdout: {result.stdout},
stderr: {result.stderr}")
self.assertIn("OK", result.stdout)
+ def test_circular_lazy_import_does_not_crash_for_gh_144727(self):
+ with tempfile.TemporaryDirectory() as tmpdir:
+ a_path = os.path.join(tmpdir, "a.py")
+ b_path = os.path.join(tmpdir, "b.py")
+
+ with open(a_path, "w") as f:
+ f.write(textwrap.dedent("""\
+ lazy import b
+
+ def something():
+ b.hello()
+
+ something()
+ """))
+
+ with open(b_path, "w") as f:
+ f.write(textwrap.dedent("""\
+ lazy import a
+
+ def hello():
+ print(a)
+ """))
+
+ result = subprocess.run(
+ [sys.executable, a_path],
+ capture_output=True,
+ text=True,
+ cwd=tmpdir,
+ )
+ # Should get a proper Python error, not a crash
+ self.assertEqual(result.returncode, 1)
+ self.assertIn("Error", result.stderr)
+
class GlobalsAndDictTests(unittest.TestCase):
"""Tests for globals() and __dict__ behavior with lazy imports.
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