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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Py_Main and Py_RunMain SystemExit documentation does not match actual behavior","articleBody":"A few months ago, #8023 added some details to the docs about how `Py_RunMain` determines its exit status. Specifically, it wrote that`Py_RunMain` exits the process on an unhandled `SystemExit`. \n\nBut this isn't the case, at least not when running via the `pymain_run_module` path (the other paths aren't so clear to me). The relevant code is in `pymain_err_print`, which specifically checks for `SystemExit` in order to avoid passing it to `PyErr_Print`, which is where `exit` would actually be called.\n\nMy understanding is that `Py_RunMain` was intended for an embedded context, in which case exiting the process is probably not desirable. \n\nThe docs of `Py_Main` have specified the process exiting behavior for much longer, but right now it looks like both functions share the same implementation.\n\n@vstinner @ncoghlan \n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-135337\n* gh-135394\n* gh-135395\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/mhsmith","@type":"Person","name":"mhsmith"},"datePublished":"2025-05-01T16:22:02.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":10},"url":"https://github.com/133264/cpython/issues/133264"}