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gh-157006: Clear PYTHON* env vars in test_embed #157009

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gh-157006: Clear PYTHON* env vars in test_embed #157009

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4 changes: 3 additions & 1 deletion Lib/test/test_embed.py
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Original file line number Diff line number Diff line change
Expand Up @@ -137,6 +137,8 @@ def run_embedded_interpreter(self, *args, env=None,
"""Runs a test in the embedded interpreter"""
cmd = [self.test_exe]
cmd.extend(args)
if env is None:
env = remove_python_envvars()
if env is not None and MS_WINDOWS:
# Windows requires at least the SYSTEMROOT environment variable to
# start Python.
Expand Down Expand Up @@ -628,7 +630,7 @@ def test_init_run_main_startup_exitcode(self):
with open(filename, 'x') as fp:
fp.write(CODE_EXITCODE_123)

env = dict(os.environ)
env = remove_python_envvars()
env['PYTHONSTARTUP'] = filename
self.check_program_exitcode("test_init_run_main_interactive_exitcode",
env=env,
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4 changes: 4 additions & 0 deletions Misc/NEWS.d/next/Tests/2026-09-06-12-00-00.gh-issue-157006.Xk9mPq.rst
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@@ -0,0 +1,4 @@
Fix ``test.test_embed`` to clear ``PYTHON*`` environment variables (including
``PYTHONSTARTUP``) before running embedded interpreter tests, preventing failures
when the test runner's environment has these variables set (e.g., by VS Code's
shell integration).
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