Mar 24, 2026 · Mar 24, 2026 · Mar 24, 2026 · Mar 24, 2026 · Mar 24, 2026 · Mar 24, 2026
diff --git a/Lib/test/test_lazy_import/__init__.py b/Lib/test/test_lazy_import/__init__.py
        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):
        """-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
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2026-03-24-13-06-52.gh-issue-146369.6wDI6S.rst b/Misc/NEWS.d/next/Core_and_Builtins/2026-03-24-13-06-52.gh-issue-146369.6wDI6S.rst
 Ensure ``-X lazy_imports=none``` and ``PYTHON_LAZY_IMPORTS=none``` override
 ``__lazy_modules__``. Patch by Hugo van Kemenade.
diff --git a/Python/ceval.c b/Python/ceval.c
            break;
    }

    if (!lazy) {
    if (!lazy && PyImport_GetLazyImportsMode() != PyImport_LAZY_NONE) {
        // See if __lazy_modules__ forces this to be lazy.
        lazy = check_lazy_import_compatibility(tstate, globals, name, level);
        if (lazy < 0) {
Original file line number	Diff line number	Diff line change
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):
Copy link Member vstinnerMar 24, 2026 Choose a reason for hiding this comment The reason will be displayed to describe this comment to others.Learn more. You can merge the two tests since they have code in common: deftest_cli_disable_lazy_imports(self):code=textwrap.dedent(""" import sys __lazy_modules__ = ["json"] import json if 'json' in sys.modules: print("EAGER") else: print("LAZY") """)# -X lazy_imports=none should override __lazy_modules__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)# PYTHON_LAZY_IMPORTS=none should override __lazy_modules__env=dict(os.environ,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) Copy link MemberAuthor hugovkMar 24, 2026 Choose a reason for hiding this comment The reason will be displayed to describe this comment to others.Learn more. The only common code is the example in`code`, so I think that's okay? They are testing two different scenarios, so separate cases are fine. It's similar to the preceding two tests, which also share`code` and test different things. Or we could use subtests? Copy link Member vstinnerMar 24, 2026 Choose a reason for hiding this comment The reason will be displayed to describe this comment to others.Learn more. The only common code is the example in code, so I think that's okay? It's just a suggestion, feel free to ignore it. Your PR was already approved ;-) hugovk reacted with thumbs up emoji
		"""-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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Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		Ensure ``-X lazy_imports=none``` and ``PYTHON_LAZY_IMPORTS=none``` override
		``__lazy_modules__``. Patch by Hugo van Kemenade.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -3086,7 +3086,7 @@ _PyEval_LazyImportName(PyThreadState tstate, PyObject builtins,
		break;
		}

		if (!lazy) {
		if (!lazy && PyImport_GetLazyImportsMode() != PyImport_LAZY_NONE) {
		// See if __lazy_modules__ forces this to be lazy.
		lazy = check_lazy_import_compatibility(tstate, globals, name, level);
		if (lazy < 0) {
Expand Down