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gh-146369: Ensure PYTHON_LAZY_IMPORTS=none overrides __lazy_modules__ #146371

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Merged
pablogsal merged 3 commits into from
Mar 25, 2026
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Merged

gh-146369: Ensure PYTHON_LAZY_IMPORTS=none overrides __lazy_modules__ #146371

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Failing test: lazy_imports=none or PYTHON_LAZY_IMPORTS=none should ov…
hugovk Mar 24, 2026
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Ensure lazy_imports=none or PYTHON_LAZY_IMPORTS=none override __lazy_…
hugovk Mar 24, 2026
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hugovk Mar 24, 2026
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Failing test: lazy_imports=none or PYTHON_LAZY_IMPORTS=none should ov… 
…erride __lazy_modules__
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@hugovk
hugovk committed Mar 24, 2026
commit 1b490e6fb15a66bd036c1e4c833d3a1b4d6ae921
43 changes: 43 additions & 0 deletions Lib/test/test_lazy_import/__init__.py
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Expand Up @@ -1088,6 +1088,49 @@ def test_env_var_lazy_imports_none_disables_all_lazy(self):
self.assertEqual(result.returncode, 0, f"stderr: {result.stderr}")
self.assertIn("EAGER", result.stdout)

def test_cli_lazy_imports_none_disables_dunder_lazy_modules(self):
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"""-X lazy_imports=none should override __lazy_modules__."""
code = textwrap.dedent("""
import sys
__lazy_modules__ = ["json"]
import json
if 'json' in sys.modules:
print("EAGER")
else:
print("LAZY")
""")
result = subprocess.run(
[sys.executable, "-X", "lazy_imports=none", "-c", code],
capture_output=True,
text=True,
)
self.assertEqual(result.returncode, 0, f"stderr: {result.stderr}")
self.assertIn("EAGER", result.stdout)

def test_env_var_lazy_imports_none_disables_dunder_lazy_modules(self):
"""PYTHON_LAZY_IMPORTS=none should override __lazy_modules__."""
code = textwrap.dedent("""
import sys
__lazy_modules__ = ["json"]
import json
if 'json' in sys.modules:
print("EAGER")
else:
print("LAZY")
""")
import os

env = os.environ.copy()
env["PYTHON_LAZY_IMPORTS"] = "none"
result = subprocess.run(
[sys.executable, "-c", code],
capture_output=True,
text=True,
env=env,
)
self.assertEqual(result.returncode, 0, f"stderr: {result.stderr}")
self.assertIn("EAGER", result.stdout)

def test_cli_overrides_env_var(self):
"""Command-line option should take precedence over environment variable."""
# PEP 810: -X lazy_imports takes precedence over PYTHON_LAZY_IMPORTS
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