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run_embedded_interpreter() now defaults to remove_python_envvars() when no explicit env is provided, preventing PYTHONSTARTUP (e.g., set by VS Code shell integration) from leaking into the embedded interpreter and causing test failures. Also fix test_init_run_main_startup_exitcode to use remove_python_envvars() instead of dict(os.environ) as the base environment.
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When
PYTHONSTARTUP(or otherPYTHON*env vars) is set in thetest runner's environment — for example, by VS Code's shell integration —
test_embedfails because the embedded interpreter runs the startupscript and produces unexpected output (e.g., "Ctrl click to launch VS
Code Native REPL" before the expected "ok! Py_RunMain() returned 123").
run_embedded_interpreter()now defaults toremove_python_envvars()when no explicit env is providedtest_init_run_main_startup_exitcodenow usesremove_python_envvars()as the base environment instead ofdict(os.environ)Closes #157006