Issue #19255: The builtins module is restored to initial value before
cleaning other modules. The sys and builtins modules are cleaned last.
diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py
index 6843066..c078b44 100644
--- a/Lib/test/test_builtin.py
+++ b/Lib/test/test_builtin.py
@@ -16,6 +16,7 @@
import warnings
from operator import neg
from test.support import TESTFN, unlink, run_unittest, check_warnings
+from test.script_helper import assert_python_ok
try:
import pty, signal
except ImportError:
@@ -1592,6 +1593,34 @@
data = 'The quick Brown fox Jumped over The lazy Dog'.split()
self.assertRaises(TypeError, sorted, data, None, lambda x,y: 0)
+
+class ShutdownTest(unittest.TestCase):
+
+ def test_cleanup(self):
+ # Issue #19255: builtins are still available at shutdown
+ code = """if 1:
+ import builtins
+ import sys
+
+ class C:
+ def __del__(self):
+ print("before")
+ # Check that builtins still exist
+ len(())
+ print("after")
+
+ c = C()
+ # Make this module survive until builtins and sys are cleaned
+ builtins.here = sys.modules[__name__]
+ sys.here = sys.modules[__name__]
+ # Create a reference loop so that this module needs to go
+ # through a GC phase.
+ here = sys.modules[__name__]
+ """
+ rc, out, err = assert_python_ok("-c", code)
+ self.assertEqual(["before", "after"], out.decode().splitlines())
+
+
def load_tests(loader, tests, pattern):
from doctest import DocTestSuite
tests.addTest(DocTestSuite(builtins))