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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[C API] Py_mod_multiple_interpreters Added to Limited C API Without Versioning","articleBody":"# Bug report\n\n(See https://github.com/python/cpython/issues/110968#issuecomment-1766504893.)\n\nWhen I added `Py_mod_multiple_interpreters`[^1] to Include/moduleobject.h, I forgot to restrict the limited API version in which it should be there.\n\n[^1]: I added `Py_mod_multiple_interpreters` in [gh-104148](https://github.com/python/cpython/pull/104148) (1c420e138fd828895b6bd3c44ef99156e8796095), along with some pre-defined values (e.g. `Py_MOD_MULTIPLE_INTERPRETERS_SUPPORTED`).  The direct motivation was to make an implicit contract in [PEP 489](https://peps.python.org/pep-0489/) (i.e. \"must support subinterpreters\") explicit.  (See [gh-104108](https://github.com/python/cpython/issues/104108).)  The indirect motivation was [PEP 684](https://peps.python.org/pep-0684/).\n\nThe fix should be something similar to what we did in [gh-110969](https://github.com/python/cpython/pull/110969), combined with [gh-111584](https://github.com/python/cpython/pull/111584).  We will need to backport the change to 3.12.\n\nBasically, the change would be something like:\n\n```diff\n- #define Py_mod_multiple_interpreters 3\n+ #if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 \u003e= 0x030c0000\n+ #  define Py_mod_multiple_interpreters 3\n+ #endif\n```\n\nFYI, gh-110968 already dealt with the same issue for the pre-defined slot values (e.g. `Py_MOD_MULTIPLE_INTERPRETERS_SUPPORTED`).\n\nCC @encukou, @vstinner\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-111707\n* gh-111787\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/ericsnowcurrently","@type":"Person","name":"ericsnowcurrently"},"datePublished":"2023-11-03T16:04:35.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/111698/cpython/issues/111698"}