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gh-150167: Prevent successful import of bz2 under lazy_imports=all if _bz2 is unavailable #157321

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gh-150167: Prevent successful import of bz2 under lazy_imports=all if _bz2 is unavailable #157321

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04a8f12
Add a test for import failure under lazy_imports=all
DavidCEllis Sep 11, 2026
131ae67
Force the eager import of `_bz2` inside `bz2.py`
DavidCEllis Jul 27, 2026
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1 change: 1 addition & 0 deletions Lib/bz2.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@
import io
import os

import _bz2; _bz2 # Force the eager import of _bz2
from _bz2 import BZ2Compressor, BZ2Decompressor


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14 changes: 14 additions & 0 deletions Lib/test/test_bz2.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1222,6 +1222,20 @@ def test_newline(self):
self.assertEqual(f.readlines(), [text])


class TestMissingModuleImport(unittest.TestCase):
# Test that module import fails if _bz2 is not available
# See: https://github.com/python/cpython/issues/150167
@support.thread_unsafe("Modifies global import state")
def test_under_lazy_all(self):
import_state = sys.get_lazy_imports()
try:
sys.set_lazy_imports("all")
with self.assertRaises(ImportError):
import_helper.import_fresh_module("bz2", blocked=("_bz2",))
finally:
sys.set_lazy_imports(import_state)


def tearDownModule():
support.reap_children()

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